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Alvarez-Buylla ER, García-Ponce B, Sánchez MDLP, Espinosa-Soto C, García-Gómez ML, Piñeyro-Nelson A, Garay-Arroyo A. MADS-box genes underground becoming mainstream: plant root developmental mechanisms. THE NEW PHYTOLOGIST 2019; 223:1143-1158. [PMID: 30883818 DOI: 10.1111/nph.15793] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 02/26/2019] [Indexed: 05/19/2023]
Abstract
Plant growth is largely post-embryonic and depends on meristems that are active throughout the lifespan of an individual. Developmental patterns rely on the coordinated spatio-temporal expression of different genes, and the activity of transcription factors is particularly important during most morphogenetic processes. MADS-box genes constitute a transcription factor family in eukaryotes. In Arabidopsis, their proteins participate in all major aspects of shoot development, but their role in root development is still not well characterized. In this review we synthetize current knowledge pertaining to the function of MADS-box genes highly expressed in roots: XAL1, XAL2, ANR1 and AGL21, as well as available data for other MADS-box genes expressed in this organ. The role of Trithorax group and Polycomb group complexes on MADS-box genes' epigenetic regulation is also discussed. We argue that understanding the role of MADS-box genes in root development of species with contrasting architectures is still a challenge. Finally, we propose that MADS-box genes are key components of the gene regulatory networks that underlie various gene expression patterns, each one associated with the distinct developmental fates observed in the root. In the case of XAL1 and XAL2, their role within these networks could be mediated by regulatory feedbacks with auxin.
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Affiliation(s)
- Elena R Alvarez-Buylla
- Departamento de Ecología Funcional, Instituto de Ecología, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
| | - Berenice García-Ponce
- Departamento de Ecología Funcional, Instituto de Ecología, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
| | - María de la Paz Sánchez
- Departamento de Ecología Funcional, Instituto de Ecología, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
| | - Carlos Espinosa-Soto
- Instituto de Física, Universidad Autónoma de San Luis Potosí, Manuel Nava 6, Zona Universitaria, San Luis Potosí, CP 78290, Mexico
| | - Mónica L García-Gómez
- Departamento de Ecología Funcional, Instituto de Ecología, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
| | - Alma Piñeyro-Nelson
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
- Departamento de Producción Agrícola y Animal, Universidad Autónoma Metropolitana Xochimilco, Ciudad de México, 04960, Mexico
| | - Adriana Garay-Arroyo
- Departamento de Ecología Funcional, Instituto de Ecología, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, D.F. 04510, Mexico
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202
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Aoki S, Toh S, Nakamichi N, Hayashi Y, Wang Y, Suzuki T, Tsuji H, Kinoshita T. Regulation of stomatal opening and histone modification by photoperiod in Arabidopsis thaliana. Sci Rep 2019; 9:10054. [PMID: 31332248 PMCID: PMC6646381 DOI: 10.1038/s41598-019-46440-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 06/17/2019] [Indexed: 11/23/2022] Open
Abstract
Stomatal movements are regulated by many environmental signals, such as light, CO2, temperature, humidity, and drought. Recently, we showed that photoperiodic flowering components have positive effects on light-induced stomatal opening in Arabidopsis thaliana. In this study, we determined that light-induced stomatal opening and increased stomatal conductance were larger in plants grown under long-day (LD) conditions than in those grown under short-day (SD) conditions. Gene expression analyses using purified guard cell protoplasts revealed that FT and SOC1 expression levels were significantly increased under LD conditions. Interestingly, the enhancement of light-induced stomatal opening and increased SOC1 expression in guard cells due to LD conditions persisted for at least 1 week after plants were transferred to SD conditions. We then investigated histone modification using chromatin immunoprecipitation–PCR, and observed increased trimethylation of lysine 4 on histone 3 (H3K4) around SOC1. We also found that LD-dependent enhancement of light-induced stomatal opening and H3K4 trimethylation in SOC1 were suppressed in the ft-2 mutant. These results indicate that photoperiod is an important environmental cue regulating stomatal opening, and that LD conditions enhance light-induced stomatal opening and epigenetic modification (H3K4 trimethylation) around SOC1, a positive regulator of stomatal opening, in an FT-dependent manner. Thus, this study provides novel insights into stomatal responses to photoperiod.
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Affiliation(s)
- Saya Aoki
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602, Japan.,Ministry of Education, Culture, Sports, Science and Technology, Chiyoda, Tokyo, 100-8959, Japan
| | - Shigeo Toh
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602, Japan.,Department of Life Sciences, School of Agriculture, Meiji University, Tama, Kawasaki, 214-8571, Japan
| | - Norihito Nakamichi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Chikusa, Nagoya, 464-8602, Japan
| | - Yuki Hayashi
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602, Japan
| | - Yin Wang
- Institute for Advanced Research, Nagoya University, Chikusa, Nagoya, 464-8602, Japan
| | - Takamasa Suzuki
- Department of Biological Chemistry, College of Bioscience and Biotechnology, Chubu University, 1200 Matsumoto-cho, Kasugai, Aichi, 487-8501, Japan
| | - Hiroyuki Tsuji
- Kihara Institute for Biological Research, Yokohama City University, 641-12 Maioka, Totsuka, Yokohama, 244-0813, Japan
| | - Toshinori Kinoshita
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602, Japan. .,Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Chikusa, Nagoya, 464-8602, Japan.
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203
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Wang S, Gao J, Xue J, Xue Y, Li D, Guan Y, Zhang X. De novo sequencing of tree peony (Paeonia suffruticosa) transcriptome to identify critical genes involved in flowering and floral organ development. BMC Genomics 2019; 20:572. [PMID: 31296170 PMCID: PMC6624964 DOI: 10.1186/s12864-019-5857-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 05/29/2019] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Tree peony (Paeonia suffruticosa Andrews) is a globally famous ornamental flower, with large and colorful flowers and abundant flower types. However, a relatively short and uniform flowering period hinders the applications and production of ornamental tree peony. Unfortunately, the molecular mechanism of regulating flowering time and floral organ development in tree peony has yet to be elucidated. Because of the absence of genomic information, 454-based transcriptome sequence technology for de novo transcriptomics was used to identify the critical flowering genes using re-blooming, non-re-blooming, and wild species of tree peonies. RESULTS A total of 29,275 unigenes were obtained from the bud transcriptome, with an N50 of 776 bp. The average length of unigenes was 677.18 bp, and the longest sequence was 5815 bp. Functional annotation showed that 22,823, 17,321, 13,312, 20,041, and 9940 unigenes were annotated by NCBI-NR, Swiss-Prot, COG, GO, and KEGG, respectively. Within the differentially expressed genes (DEGs) 64 flowering-related genes were identified and some important flowering genes were also characterized by bioinformatics methods, reverse transcript polymerase chain reaction (RT-PCR), and rapid-amplification of cDNA ends (RACE). Then, the putative genetic network of flowering induction pathways and a floral organ development model were put forward, according to the comparisons of DEGs in any two samples and expression levels of the important flowering genes in differentiated buds, buds from different developmental stages, and with GA or vernalization treated. In tree peony, five pathways (long day, vernalization, autonomous, age, and gibberellin) regulated flowering, and the floral organ development followed an ABCE model. Moreover, it was also found that the genes PsAP1, PsCOL1, PsCRY1, PsCRY2, PsFT, PsLFY, PsLHY, PsGI, PsSOC1, and PsVIN3 probably regulated re-blooming of tree peony. CONCLUSION This study provides a comprehensive report on the flowering-related genes in tree peony for the first time and investigated the expression levels of the critical flowering related genes in buds of different cultivars, developmental stages, differentiated primordium, and flower parts. These results could provide valuable insights into the molecular mechanisms of flowering time regulation and floral organ development.
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Affiliation(s)
- Shunli Wang
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, People's Republic of China.,Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, Institute of Peony, Chinese Academy of Agricultural Science, Beijing, 100081, China
| | - Jie Gao
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, People's Republic of China.,Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, Institute of Peony, Chinese Academy of Agricultural Science, Beijing, 100081, China
| | - Jingqi Xue
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, People's Republic of China.,Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, Institute of Peony, Chinese Academy of Agricultural Science, Beijing, 100081, China
| | - Yuqian Xue
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, People's Republic of China.,Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, Institute of Peony, Chinese Academy of Agricultural Science, Beijing, 100081, China
| | - Dandan Li
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, People's Republic of China.,Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, Institute of Peony, Chinese Academy of Agricultural Science, Beijing, 100081, China
| | - Yanren Guan
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, People's Republic of China.,Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, Institute of Peony, Chinese Academy of Agricultural Science, Beijing, 100081, China
| | - Xiuxin Zhang
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, Beijing, People's Republic of China. .,Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, Institute of Peony, Chinese Academy of Agricultural Science, Beijing, 100081, China.
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204
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Homeologous regulation of Frigida-like genes provides insights on reproductive development and somatic embryogenesis in the allotetraploid Coffea arabica. Sci Rep 2019; 9:8446. [PMID: 31186437 PMCID: PMC6560031 DOI: 10.1038/s41598-019-44666-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 05/22/2019] [Indexed: 01/10/2023] Open
Abstract
Coffea arabica is an allotetraploid of high economic importance. C. arabica transcriptome is a combination of the transcripts of two parental genomes (C. eugenioides and C. canephora) that gave rise to the homeologous genes of the species. Previous studies have reported the transcriptional dynamics of C. arabica. In these reports, the ancestry of homeologous genes was identified and the overall regulation of homeologous differential expression (HDE) was explored. One of these genes is part of the FRIGIDA-like family (FRL), which includes the Arabidopsis thaliana flowering-time regulation protein, FRIGIDA (FRI). As nonfunctional FRI proteins give rise to rapid-cycling summer annual ecotypes instead of vernalization-responsive winter-annuals, allelic variation in FRI can modulate flowering time in A. thaliana. Using bioinformatics, genomic analysis, and the evaluation of gene expression of homeologs, we characterized the FRL gene family in C. arabica. Our findings indicate that C. arabica expresses 10 FRL homeologs, and that, throughout flower and fruit development, these genes are differentially transcribed. Strikingly, in addition to confirming the expression of FRL genes during zygotic embryogenesis, we detected FRL expression during direct somatic embryogenesis, a novel finding regarding the FRL gene family. The HDE profile of FRL genes suggests an intertwined homeologous gene regulation. Furthermore, we observed that FLC gene of C. arabica has an expression profile similar to that of CaFRL genes.
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205
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Chen W, Hao WJ, Xu YX, Zheng C, Ni DJ, Yao MZ, Chen L. Isolation and Characterization of CsWRKY7, a Subgroup IId WRKY Transcription Factor from Camellia sinensis, Linked to Development in Arabidopsis. Int J Mol Sci 2019; 20:ijms20112815. [PMID: 31181825 PMCID: PMC6600228 DOI: 10.3390/ijms20112815] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 05/31/2019] [Accepted: 06/06/2019] [Indexed: 11/16/2022] Open
Abstract
WRKY transcription factors (TFs) containing one or two WRKY domains are a class of plant TFs that respond to diverse abiotic stresses and are associated with developmental processes. However, little has been known about the function of WRKY gene in tea plant. In this study, a subgroup IId WRKY gene CsWRKY7 was isolated from Camellia sinensis, which displayed amino acid sequence homology with Arabidopsis AtWRKY7 and AtWRKY15. Subcellular localization prediction indicated that CsWRKY7 localized to nucleus. Cis-acting elements detected in the promotor region of CsWRKY7 are mainly involved in plant response to environmental stress and growth. Consistently, expression analysis showed that CsWRKY7 transcripts responded to NaCl, mannitol, PEG, and diverse hormones treatments. Additionally, CsWRKY7 exhibited a higher accumulation both in old leaves and roots compared to bud. Seed germination and root growth assay indicated that overexpressed CsWRKY7 in transgenic Arabidopsis was not sensitive to NaCl, mannitol, PEG, and low concentration of ABA treatments. CsWRKY7 overexpressing Arabidopsis showed a late-flowering phenotype under normal conditions compared to wild type. Furthermore, gene expression analysis showed that the transcription levels of the flowering time integrator gene FLOWERING LOCUS T (FT) and the floral meristem identity genes APETALA1 (AP1) and LEAFY (LFY) were lower in WRKY7-OE than in the WT. Taken together, these findings indicate that CsWRKY7 TF may participate in plant growth. This study provides a potential strategy to breed late-blooming tea cultivar.
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Affiliation(s)
- Wei Chen
- Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture; Tea Research Institute Chinese Academy of Agricultural Sciences, 9 South Meiling Road, Hangzhou 310008, Zhejiang, China.
- College of Horticulture and Forestry Science, Huazhong Agricultural University, 1 Shizishan Street, Hongshan District, Wuhan 430070, Hubei, China.
| | - Wan-Jun Hao
- Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture; Tea Research Institute Chinese Academy of Agricultural Sciences, 9 South Meiling Road, Hangzhou 310008, Zhejiang, China.
| | - Yan-Xia Xu
- Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture; Tea Research Institute Chinese Academy of Agricultural Sciences, 9 South Meiling Road, Hangzhou 310008, Zhejiang, China.
| | - Chao Zheng
- Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture; Tea Research Institute Chinese Academy of Agricultural Sciences, 9 South Meiling Road, Hangzhou 310008, Zhejiang, China.
| | - De-Jiang Ni
- College of Horticulture and Forestry Science, Huazhong Agricultural University, 1 Shizishan Street, Hongshan District, Wuhan 430070, Hubei, China.
| | - Ming-Zhe Yao
- Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture; Tea Research Institute Chinese Academy of Agricultural Sciences, 9 South Meiling Road, Hangzhou 310008, Zhejiang, China.
| | - Liang Chen
- Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture; Tea Research Institute Chinese Academy of Agricultural Sciences, 9 South Meiling Road, Hangzhou 310008, Zhejiang, China.
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206
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Kinmonth-Schultz HA, MacEwen MJS, Seaton DD, Millar AJ, Imaizumi T, Kim SH. An explanatory model of temperature influence on flowering through whole-plant accumulation of FLOWERING LOCUS T in Arabidopsis thaliana. IN SILICO PLANTS 2019; 1:diz006. [PMID: 36203490 PMCID: PMC9534314 DOI: 10.1093/insilicoplants/diz006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We assessed mechanistic temperature influence on flowering by incorporating temperature-responsive flowering mechanisms across developmental age into an existing model. Temperature influences the leaf production rate as well as expression of FLOWERING LOCUS T (FT), a photoperiodic flowering regulator that is expressed in leaves. The Arabidopsis Framework Model incorporated temperature influence on leaf growth but ignored the consequences of leaf growth on and direct temperature influence of FT expression. We measured FT production in differently aged leaves and modified the model, adding mechanistic temperature influence on FT transcription, and causing whole-plant FT to accumulate with leaf growth. Our simulations suggest that in long days, the developmental stage (leaf number) at which the reproductive transition occurs is influenced by day length and temperature through FT, while temperature influences the rate of leaf production and the time (in days) the transition occurs. Further, we demonstrate that FT is mainly produced in the first 10 leaves in the Columbia (Col-0) accession, and that FT accumulation alone cannot explain flowering in conditions in which flowering is delayed. Our simulations supported our hypotheses that: (i) temperature regulation of FT, accumulated with leaf growth, is a component of thermal time, and (ii) incorporating mechanistic temperature regulation of FT can improve model predictions when temperatures change over time.
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Affiliation(s)
- Hannah A. Kinmonth-Schultz
- Department of Biology, University of Washington, Seattle, WA 98195, USA
- Present address: Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045, USA
| | - Melissa J. S. MacEwen
- Department of Biology, University of Washington, Seattle, WA 98195, USA
- Present address: Department of Pharmacology, University of Washington, Seattle, WA 98195, USA
| | - Daniel D. Seaton
- SynthSys and School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3JY, UK
- Present address: European Bioinformatics Institute, European Molecular Biology Laboratory, Cambridge CB10 1SD, UK
| | - Andrew J. Millar
- SynthSys and School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3JY, UK
| | - Takato Imaizumi
- Department of Biology, University of Washington, Seattle, WA 98195, USA
| | - Soo-Hyung Kim
- School of Environmental and Forest Sciences, University of Washington, Seattle, WA 98195, USA
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207
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Liu X, Liu Z, Hao Z, Chen G, Qi K, Zhang H, Jiao H, Wu X, Zhang S, Wu J, Wang P. Characterization of Dof family in Pyrus bretschneideri and role of PbDof9.2 in flowering time regulation. Genomics 2019; 112:712-720. [PMID: 31078718 DOI: 10.1016/j.ygeno.2019.05.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 05/04/2019] [Accepted: 05/08/2019] [Indexed: 12/26/2022]
Abstract
DNA binding with One Finger (Dof) proteins are plant-specific transcription factors with highly conserved Dof domain, including C2-C2 type zinc finger motifs. In this study, we identified 45 PbDofs in pear (Pyrusbretschneideri). PbDofs were classified into eight subfamilies by phylogenetic analysis. Conserved motifs of PbDof proteins were analyzed by MEME. PbDofs in subfamily D1 werehomologous to CDFs in Arabidopsis. In this study, we showed that PbDof9.2 was regulated by both the circadian clock and photoperiod. PbDof9.2-GFP proteinwas localized in the nucleus. Overexpression of PbDof9.2 in Arabidopsis caused delayed flowering time. PbDof9.2 suppressed the flowering time regulator FT and could repress flowering time by promoting activity of PbTFL1a and PbTFL1b promoter. These results suggest that Doftranscription factors have conserved functions in plant development.
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Affiliation(s)
- Xueying Liu
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhe Liu
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Ziwei Hao
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Guodong Chen
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Kaijie Qi
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Hao Zhang
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Huijun Jiao
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Xiao Wu
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Shaoling Zhang
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Juyou Wu
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China.
| | - Peng Wang
- Center of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China.
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208
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Huang F, Liu T, Tang J, Duan W, Hou X. BcMAF2 activates BcTEM1 and represses flowering in Pak-choi (Brassica rapa ssp. chinensis). PLANT MOLECULAR BIOLOGY 2019; 100:19-32. [PMID: 31001712 DOI: 10.1007/s11103-019-00867-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 01/07/2019] [Indexed: 05/08/2023]
Abstract
BcMAF2 plays a key role in flowering regulation by controlling BcTEM1, BcSOC1 and BCSPL15 in Pak-choi. Flowering is a key event in the life cycle of plants. Flowering time shows an extensive variation from different Pak-choi (Brassica rapa ssp. chinensis) cultivars. However, the regulation mechanism of flowering in Pak-choi remains rarely known. In this study, a systematic identification and functional analysis of a Pak-choi MADS Affecting Flowering (MAF) gene, BcMAF2, was carried out. BcMAF2 encoded a protein containing a conserved MADS-box domain, which was localized in the nucleus. QPCR analysis indicated that the expression of BcMAF2 was higher in the leaves and flowers. Overexpression of BcMAF2 in Arabidopsis showed that BcMAF2 repressed flowering, which was further confirmed by silencing endogenous BcMAF2 in Pak-choi. In addition, Tempranillo 1 (TEM1) expression was up-regulated and MAF2 expression was down-regulated in the BcMAF2-overexpressing Arabidopsis. The expression of BcMAF2 and BcTEM1 was down-regulated in BcMAF2-silencing Pak-choi plants. The yeast one-hybrid, dual luciferase and qPCR results revealed that BcMAF2 protein could directly bind to BcTEM1 promoter and activate its expression, which was not reported in Arabidopsis. Meanwhile, a self-inhibition was found in BcMAF2. Taken together, this work suggested that BcMAF2 could repress flowering by directly activating BcTEM1.
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Affiliation(s)
- Feiyi Huang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement/Key Laboratory of Biology and Germplasm Enhancement of Horticultural Crops in East China, Ministry of Agriculture, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China
| | - Tongkun Liu
- State Key Laboratory of Crop Genetics and Germplasm Enhancement/Key Laboratory of Biology and Germplasm Enhancement of Horticultural Crops in East China, Ministry of Agriculture, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jun Tang
- Institute of Vegetable Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Weike Duan
- State Key Laboratory of Crop Genetics and Germplasm Enhancement/Key Laboratory of Biology and Germplasm Enhancement of Horticultural Crops in East China, Ministry of Agriculture, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xilin Hou
- State Key Laboratory of Crop Genetics and Germplasm Enhancement/Key Laboratory of Biology and Germplasm Enhancement of Horticultural Crops in East China, Ministry of Agriculture, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
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209
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Win KT, Zhang C, Silva RR, Lee JH, Kim YC, Lee S. Identification of quantitative trait loci governing subgynoecy in cucumber. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2019; 132:1505-1521. [PMID: 30710191 DOI: 10.1007/s00122-019-03295-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 01/28/2019] [Indexed: 05/13/2023]
Abstract
QTL-seq analysis identified three major QTLs conferring subgynoecy in cucumbers. Furthermore, sequence and expression analyses predicted candidate genes controlling subgynoecy. The cucumber (Cucumis sativus L.) is a typical monoecious having individual male and female flowers, and sex differentiation is an important developmental process that directly affects its fruit yield. Subgynoecy represents a sex form with a high degree of femaleness and would have alternative use as gynoecy under limited resource conditions. Recently, many studies have been reported that QTL-seq, which integrates the advantages of bulked segregant analysis and high-throughput whole-genome resequencing, can be a rapid and cost-effective way of mapping QTLs. Segregation analysis in the F2 and BC1 populations derived from a cross between subgynoecious LOSUAS and monoecious BMB suggested the quantitative nature of subgynoecy in cucumbers. Both genome-wide SNP profiling of subgynoecious and monoecious bulks constructed from F2 and BC1 plants consistently identified three significant genomic regions, one on chromosome 3 (sg3.1) and another two on short and long arms of chromosome 1 (sg1.1 and sg1.2). Classical QTL analysis using the F2 confirmed sg3.1 (R2 = 42%), sg1.1 (R2 = 29%) and sg1.2 (R2 = 18%) as major QTLs. These results revealed the unique genetic inheritance of subgynoecious line LOSUAS through two distinct major QTLs, sg3.1 and sg1.1, which mainly increase degree of femaleness, while another QTL, sg1.2, contributes to decrease it. This study demonstrated that QTL-seq allows rapid and powerful detection of QTLs using preliminary generation mapping populations such as F2 or BC1 population and further that the identified QTLs could be useful for molecular breeding of cucumber lines with high yield potential.
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Affiliation(s)
- Khin Thanda Win
- Plant Genomics Laboratory, Department of Plant Biotechnology, College of Life Sciences, Sejong University, 209 Neungdong-ro, Gwanjing-gu, Seoul, 143-747, Republic of Korea
| | - Chunying Zhang
- Plant Genomics Laboratory, Department of Plant Biotechnology, College of Life Sciences, Sejong University, 209 Neungdong-ro, Gwanjing-gu, Seoul, 143-747, Republic of Korea
| | | | - Jeong Hwan Lee
- Division of Life Sciences, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabuk-do, 54896, Republic of Korea
| | - Young-Cheon Kim
- Plant Genomics Laboratory, Department of Plant Biotechnology, College of Life Sciences, Sejong University, 209 Neungdong-ro, Gwanjing-gu, Seoul, 143-747, Republic of Korea
| | - Sanghyeob Lee
- Plant Genomics Laboratory, Department of Plant Biotechnology, College of Life Sciences, Sejong University, 209 Neungdong-ro, Gwanjing-gu, Seoul, 143-747, Republic of Korea.
- Plant Engineering Research Institute, Sejong University, 209 Neungdong-ro, Gwanjing-gu, Seoul, 143-747, Republic of Korea.
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210
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Sheng XG, Zhao ZQ, Wang JS, Yu HF, Shen YS, Zeng XY, Gu HH. Genome wide analysis of MADS-box gene family in Brassica oleracea reveals conservation and variation in flower development. BMC PLANT BIOLOGY 2019; 19:106. [PMID: 30890145 PMCID: PMC6425688 DOI: 10.1186/s12870-019-1717-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 03/12/2019] [Indexed: 05/26/2023]
Abstract
BACKGROUND MADS-box genes play important roles in vegetative growth and reproductive development and are essential for the correct development of plants (particularly inflorescences, flowers, and fruits). However, this gene family has not been identified nor their functions analyzed in Brassica oleracea. RESULTS In this study, we performed a whole-genome survey of the complete set of MADS-box genes in B. oleracea. In total, 91 MADS-box transcription factors (TFs) were identified and categorized as type I (Mα, Mβ, Mγ) and type II (MIKCC, MIKC*) groups according to the phylogeny and gene structure analysis. Among these genes, 59 were randomly distributed on 9 chromosomes, while the other 23 were assigned to 19 scaffolds and 9 genes from NCBI had no location information. Both RNA-sequencing and quantitative real-time-PCR analysis suggested that MIKC genes had more active and complex expression patterns than M type genes and most type II genes showed high flowering-related expression profiles. Additional quantitative real-time-PCR analysis of pedicel and four flower whorls revealed that the structure of the B.oleracea MIKC genes was conserved, but their homologues showed variable expression patterns compared to those in Arabidopsis thaliana. CONCLUSION This paper gives a detailed overview of the BolMADS genes and their expression patterns. The results obtained in this study provide useful information for understanding the molecular regulation of flower development and further functional characterization of MADS-box genes in B. oleracea.
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Affiliation(s)
- Xiao-Guang Sheng
- Institute of Vegetables, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021 China
| | - Zhen-Qing Zhao
- Institute of Vegetables, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021 China
| | - Jian-Sheng Wang
- Institute of Vegetables, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021 China
| | - Hui-Fang Yu
- Institute of Vegetables, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021 China
| | - Yu-Sen Shen
- Institute of Vegetables, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021 China
| | - Xiao-Yuan Zeng
- Agricultural Technology Promotion Station of Taizhou, Taizhou, 318000 China
| | - Hong-Hui Gu
- Institute of Vegetables, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021 China
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211
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Li Y, Zhang D, An N, Fan S, Zuo X, Zhang X, Zhang L, Gao C, Han M, Xing L. Transcriptomic analysis reveals the regulatory module of apple (Malus × domestica) floral transition in response to 6-BA. BMC PLANT BIOLOGY 2019; 19:93. [PMID: 30841918 PMCID: PMC6402183 DOI: 10.1186/s12870-019-1695-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 02/25/2019] [Indexed: 05/19/2023]
Abstract
BACKGROUND Insufficient production of flower buds is an intractable problem in 'Fuji' apple orchards. Although cytokinin (CK) promotes flower bud formation in apple trees, little is known about the mechanisms regulating this phenomenon. RESULTS In the present study, high-throughput RNA sequencing (RNA-Seq) of 'Nagafu No. 2' buds was conducted to characterize the transcriptional response to 6-BA treatment during key period of floral transition. A weighted gene co-expression network analysis (WGCNA) of the differentially expressed genes identified hormone signal transduction pathways, totaling 84 genes were highly correlated with the expression pattern of flowering-time genes. The up-regulation of CK signal components and a gibberellin (GA) signal repressor were found to contribute to the promotion of floral transition. In relative comparison to non-treated buds, a series of sugar metabolism- and signal- related genes were associated with relatively high levels of sucrose, fructose, and glucose during floral induction in the 6-BA treated buds. Several transcription factors (i.e. SPLs, SOC1, FD, and COL) that are involved in GA, aging, and photoperiod-regulated flowering pathways were also upregulated by the 6-BA treatment. In addition, potential transcription factors integrating CK signaling to trigger floral induction in apple were also assessed; including PHYTO-CHROME-INTERACTING FACTOR (PIF1,3), WUSCHEL-related homeobox (WOX3,13), and CK response regulators (ARR2). CONCLUSIONS The present study provides insight into the response of flowering and development-related pathways and transcription factors to 6-BA during the period of floral transition in apple. It extends our knowledge of the fundamental mechanisms associated with CK-regulated floral transition in apple trees.
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Affiliation(s)
- Youmei Li
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Dong Zhang
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Na An
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Sheng Fan
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Xiya Zuo
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Xin Zhang
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Lizhi Zhang
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Cai Gao
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Mingyu Han
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Libo Xing
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
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Barbier FF, Dun EA, Kerr SC, Chabikwa TG, Beveridge CA. An Update on the Signals Controlling Shoot Branching. TRENDS IN PLANT SCIENCE 2019; 24:220-236. [PMID: 30797425 DOI: 10.1016/j.tplants.2018.12.001] [Citation(s) in RCA: 154] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 12/11/2018] [Accepted: 12/20/2018] [Indexed: 05/21/2023]
Abstract
Many new questions on the regulation of shoot branching have been raised in recent years, prompting a review and reassessment of the role of each signal involved. Sugars and their signaling networks have been attributed a major role in the early events of axillary bud outgrowth, whereas cytokinin appears to play a critical role in the modulation of this process in response to the environment. Perception of the recently discovered hormone strigolactone is now quite well understood, while the downstream targets remain largely unknown. Recent literature has highlighted that auxin export from a bud is important for its subsequent growth.
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Affiliation(s)
- Francois F Barbier
- The University of Queensland, School of Biological Sciences, St. Lucia, QLD 4072, Australia
| | - Elizabeth A Dun
- The University of Queensland, School of Biological Sciences, St. Lucia, QLD 4072, Australia; These authors contributed equally to this publication
| | - Stephanie C Kerr
- The University of Queensland, School of Biological Sciences, St. Lucia, QLD 4072, Australia; These authors contributed equally to this publication
| | - Tinashe G Chabikwa
- The University of Queensland, School of Biological Sciences, St. Lucia, QLD 4072, Australia
| | - Christine A Beveridge
- The University of Queensland, School of Biological Sciences, St. Lucia, QLD 4072, Australia.
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Xing X, Jiang J, Huang Y, Zhang Z, Song A, Ding L, Wang H, Yao J, Chen S, Chen F, Fang W. The Constitutive Expression of a Chrysanthemum ERF Transcription Factor Influences Flowering Time in Arabidopsis thaliana. Mol Biotechnol 2019; 61:20-31. [PMID: 30448907 DOI: 10.1007/s12033-018-0134-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
AP2/ERF transcription factors (TFs) represent valuable targets for the genetic manipulation of crop plants, as they participate in the control of metabolism, growth and development, as well as in the plants' response to environmental stimuli. Here, an ERF TF encoded by the chrysanthemum (Chrysanthemum morifolium) genome, designated CmERF110, was cloned and functionally characterized. The predicted CmERF110 polypeptide included a conserved DNA-binding AP2/ERF domain. A transient expression experiment revealed that the protein was deposited in the nucleus, and a transactivation experiment in yeast suggested that it had no transcriptional activity. The gene was transcribed in the chrysanthemum root, stem and leaf, with its transcript level following a circadian rhythm under both long and short days. The effect of constitutively expressing the gene in Arabidopsis thaliana was to accelerate flowering. Transcriptional profiling implied that its effect on floral initiation operated through the photoperiod pathway.
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Affiliation(s)
- Xiaojuan Xing
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China
| | - Jiafu Jiang
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China
| | - Yaoyao Huang
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China
| | - Zixin Zhang
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China
| | - Aiping Song
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China
| | - Lian Ding
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China
| | - Haibing Wang
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China
| | - Jianjun Yao
- Shanghai Honghua Horticulture Co. Ltd., Shanghai, 200070, China
| | - Sumei Chen
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China
| | - Fadi Chen
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China
| | - Weimin Fang
- Key Laboratory of Landscape Agriculture, College of Horticulture, Ministry of Agriculture, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, Jiangsu, Republic of China.
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214
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Jian H, Zhang A, Ma J, Wang T, Yang B, Shuang LS, Liu M, Li J, Xu X, Paterson AH, Liu L. Joint QTL mapping and transcriptome sequencing analysis reveal candidate flowering time genes in Brassica napus L. BMC Genomics 2019; 20:21. [PMID: 30626329 PMCID: PMC6325782 DOI: 10.1186/s12864-018-5356-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 12/09/2018] [Indexed: 01/10/2023] Open
Abstract
Background Optimum flowering time is a key agronomic trait in Brassica napus. To investigate the genetic architecture and genetic regulation of flowering time in this important crop, we conducted quantitative trait loci (QTL) analysis of flowering time in a recombinant inbred line (RIL) population, including lines with extreme differences in flowering time, in six environments, along with RNA-Seq analysis. Results We detected 27 QTLs distributed on eight chromosomes among six environments, including one major QTL on chromosome C02 that explained 11–25% of the phenotypic variation and was stably detected in all six environments. RNA-Seq analysis revealed 105 flowering time-related differentially expressed genes (DEGs) that play roles in the circadian clock/photoperiod, autonomous pathway, and hormone and vernalization pathways. We focused on DEGs related to the regulation of flowering time, especially DEGs in QTL regions. Conclusions We identified 45 flowering time-related genes in these QTL regions, eight of which are DEGs, including key flowering time genes PSEUDO RESPONSE REGULATOR 7 (PRR7) and FY (located in a major QTL region on C02). These findings provide insights into the genetic architecture of flowering time in B. napus. Electronic supplementary material The online version of this article (10.1186/s12864-018-5356-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hongju Jian
- Chongqing Engineering Research Center for Rapeseed, College of Agronomy and Biotechnology, Southwest University, Academy of Agricultural Sciences, Chongqing, 400715, China.,Plant Genome Mapping Laboratory, University of Georgia, Athens, GA, 30605, USA
| | - Aoxiang Zhang
- Chongqing Engineering Research Center for Rapeseed, College of Agronomy and Biotechnology, Southwest University, Academy of Agricultural Sciences, Chongqing, 400715, China
| | - Jinqi Ma
- Chongqing Engineering Research Center for Rapeseed, College of Agronomy and Biotechnology, Southwest University, Academy of Agricultural Sciences, Chongqing, 400715, China
| | - Tengyue Wang
- Chongqing Engineering Research Center for Rapeseed, College of Agronomy and Biotechnology, Southwest University, Academy of Agricultural Sciences, Chongqing, 400715, China
| | - Bo Yang
- Chongqing Engineering Research Center for Rapeseed, College of Agronomy and Biotechnology, Southwest University, Academy of Agricultural Sciences, Chongqing, 400715, China
| | - Lan Shuan Shuang
- Plant Genome Mapping Laboratory, University of Georgia, Athens, GA, 30605, USA
| | - Min Liu
- Plant Genome Mapping Laboratory, University of Georgia, Athens, GA, 30605, USA
| | - Jiana Li
- Chongqing Engineering Research Center for Rapeseed, College of Agronomy and Biotechnology, Southwest University, Academy of Agricultural Sciences, Chongqing, 400715, China
| | - Xinfu Xu
- Chongqing Engineering Research Center for Rapeseed, College of Agronomy and Biotechnology, Southwest University, Academy of Agricultural Sciences, Chongqing, 400715, China
| | - Andrew H Paterson
- Plant Genome Mapping Laboratory, University of Georgia, Athens, GA, 30605, USA.
| | - Liezhao Liu
- Chongqing Engineering Research Center for Rapeseed, College of Agronomy and Biotechnology, Southwest University, Academy of Agricultural Sciences, Chongqing, 400715, China.
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Song GQ, Walworth A, Lin T, Chen Q, Han X, Irina Zaharia L, Zhong GY. VcFT-induced mobile florigenic signals in transgenic and transgrafted blueberries. HORTICULTURE RESEARCH 2019; 6:105. [PMID: 31645960 PMCID: PMC6804590 DOI: 10.1038/s41438-019-0188-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 07/26/2019] [Accepted: 07/29/2019] [Indexed: 05/03/2023]
Abstract
FLOWERING LOCUS T (FT) can promote early flowering in annual species, but such role has not been well demonstrated in woody species. We produced self and reciprocal grafts involving non-transgenic blueberry (NT) and transgenic blueberry (T) carrying a 35S-driven blueberry FT (VcFT-OX). We demonstrated that the transgenic VcFT-OX rootstock promoted flowering of non-transgenic blueberry scions in the NT (scion):T (rootstock) grafts. We further analyzed RNA-Seq profiles and six groups of phytohormones in both NT:T and NT:NT plants. We observed content changes of several hormone metabolites, in a descending order, in the transgenic NT:T, non-transgenic NT:T, and non-transgenic NT:NT leaves. By comparing differential expression transcripts (DETs) of these tissues in relative to their control, we found that the non-transgenic NT:T leaves had many DETs shared with the transgenic NT:T leaves, but very few with the transgenic NT:T roots. Interestingly, a number of these shared DETs belong to hormone pathway genes, concurring with the content changes of hormone metabolites in both transgenic and non-transgenic leaves of the NT:T plants. These results suggest that phytohormones induced by VcFT-OX in the transgenic leaves might serve as part of the signals that resulted in early flowering in both transgenic plants and the non-transgenic NT:T scions.
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Affiliation(s)
- Guo-qing Song
- Plant Biotechnology Resource and Outreach Center, Department of Horticulture, Michigan State University, East Lansing, MI 48824 USA
| | - Aaron Walworth
- Plant Biotechnology Resource and Outreach Center, Department of Horticulture, Michigan State University, East Lansing, MI 48824 USA
| | - Tianyi Lin
- Plant Biotechnology Resource and Outreach Center, Department of Horticulture, Michigan State University, East Lansing, MI 48824 USA
| | - Qiuxia Chen
- Plant Biotechnology Resource and Outreach Center, Department of Horticulture, Michigan State University, East Lansing, MI 48824 USA
| | - Xiumei Han
- Aquatic and Crop Resource Development, National Research Council of Canada, Saskatoon, SK S7N 0W9 Canada
| | - L. Irina Zaharia
- Aquatic and Crop Resource Development, National Research Council of Canada, Saskatoon, SK S7N 0W9 Canada
| | - Gan-yuan Zhong
- Grape Genetics Research Unit, USDA-ARS, Geneva, NY 14456 USA
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216
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Jiang Y, Peng J, Zhu Y, Su W, Zhang L, Jing Y, Lin S, Gao Y. The Role of EjSOC1s in Flower Initiation in Eriobotrya japonica. FRONTIERS IN PLANT SCIENCE 2019. [PMID: 30930912 DOI: 10.3389/fpls.2019.0025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The MADS-box transcription factor SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1) integrates environmental and endogenous signals to promote flowering in Arabidopsis. However, the role of SOC1 homologs in regulating flowering time in fruit trees remains unclear. To better understand the molecular mechanism of flowering regulation in loquat (Eriobotrya japonica Lindl.), two SOC1 homologs (EjSOC1-1 and EjSOC1-2) were identified and characterized in this work. Sequence analysis showed that EjSOC1-1 and EjSOC1-2 have conserved MADS-box and K-box domains. EjSOC1-1 and EjSOC1-2 were clearly expressed in vegetative organs, and high expression was detected in flower buds. As observed in paraffin-embedded sections, expression of the downstream flowering genes EjAP1s and EjLFYs started to increase at the end of June, a time when flower bud differentiation occurs. Additionally, high expression of EjSOC1-1 and EjSOC1-2 began 10 days earlier than that of EjAP1s and EjLFYs in shoot apical meristem (SAM). EjSOC1-1 and EjSOC1-2 were inhibited by short-day (SD) conditions and exogenous GA3, and flower bud differentiation did not occur after these treatments. EjSOC1-1 and EjSOC1-2 were found to be localized to the nucleus. Moreover, ectopic overexpression of EjSOC1-1 and EjSOC1-2 in wild-type Arabidopsis promoted early flowering, and overexpression of both was able to rescue the late flowering phenotype of the soc1-2 mutant. In conclusion, the results suggest that cultivated loquat flower bud differentiation in southern China begins in late June to early July and that EjSOC1-1 and EjSOC1-2 participate in the induction of flower initiation. These findings provide new insight into the artificial regulation of flowering time in fruit trees.
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Affiliation(s)
- Yuanyuan Jiang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Jiangrong Peng
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Yunmei Zhu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Wenbing Su
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Ling Zhang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Yi Jing
- BGI Genomics, BGI-Shenzhen, Shenzhen, China
| | - Shunquan Lin
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Yongshun Gao
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
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Jiang Y, Peng J, Zhu Y, Su W, Zhang L, Jing Y, Lin S, Gao Y. The Role of EjSOC1s in Flower Initiation in Eriobotrya japonica. FRONTIERS IN PLANT SCIENCE 2019; 10:253. [PMID: 30930912 PMCID: PMC6409497 DOI: 10.3389/fpls.2019.00253] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 02/15/2019] [Indexed: 05/07/2023]
Abstract
The MADS-box transcription factor SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1) integrates environmental and endogenous signals to promote flowering in Arabidopsis. However, the role of SOC1 homologs in regulating flowering time in fruit trees remains unclear. To better understand the molecular mechanism of flowering regulation in loquat (Eriobotrya japonica Lindl.), two SOC1 homologs (EjSOC1-1 and EjSOC1-2) were identified and characterized in this work. Sequence analysis showed that EjSOC1-1 and EjSOC1-2 have conserved MADS-box and K-box domains. EjSOC1-1 and EjSOC1-2 were clearly expressed in vegetative organs, and high expression was detected in flower buds. As observed in paraffin-embedded sections, expression of the downstream flowering genes EjAP1s and EjLFYs started to increase at the end of June, a time when flower bud differentiation occurs. Additionally, high expression of EjSOC1-1 and EjSOC1-2 began 10 days earlier than that of EjAP1s and EjLFYs in shoot apical meristem (SAM). EjSOC1-1 and EjSOC1-2 were inhibited by short-day (SD) conditions and exogenous GA3, and flower bud differentiation did not occur after these treatments. EjSOC1-1 and EjSOC1-2 were found to be localized to the nucleus. Moreover, ectopic overexpression of EjSOC1-1 and EjSOC1-2 in wild-type Arabidopsis promoted early flowering, and overexpression of both was able to rescue the late flowering phenotype of the soc1-2 mutant. In conclusion, the results suggest that cultivated loquat flower bud differentiation in southern China begins in late June to early July and that EjSOC1-1 and EjSOC1-2 participate in the induction of flower initiation. These findings provide new insight into the artificial regulation of flowering time in fruit trees.
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Affiliation(s)
- Yuanyuan Jiang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Jiangrong Peng
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Yunmei Zhu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Wenbing Su
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Ling Zhang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Yi Jing
- BGI Genomics, BGI-Shenzhen, Shenzhen, China
| | - Shunquan Lin
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
- *Correspondence: Shunquan Lin, Yongshun Gao,
| | - Yongshun Gao
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou, China
- *Correspondence: Shunquan Lin, Yongshun Gao,
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218
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Xing L, Zhang D, Qi S, Chen X, An N, Li Y, Zhao C, Han M, Zhao J. Transcription profiles reveal the regulatory mechanisms of spur bud changes and flower induction in response to shoot bending in apple (Malus domestica Borkh.). PLANT MOLECULAR BIOLOGY 2019; 99:45-66. [PMID: 30519825 DOI: 10.1007/s11103-018-0801-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 11/25/2018] [Indexed: 05/27/2023]
Abstract
Shoot bending, as an effective agronomic measure, has been widely used to promote flowering in 'Fuji' apple trees. Here, we examined the transcriptional responses of genes in 'Fuji' apple buds at different flowering stages under a shoot-bending treatment using RNA sequencing. A complex genetic crosstalk-regulated network, involving abscisic acid-related genes, starch metabolism and circadian rhythm-related genes, as well as stress response-related genes, was up-regulated by shoot bending, in which were contrbuted to apple flower bud formation in response to shoot-bending conditions. Flower induction plays an important role in the apple tree life cycle, but young trees produce fewer and inferior flower buds. Shoot bending, as an effective agronomic measure, has been widely used to promote flowering in 'Fuji' apple trees. However, little is known about the gene expression network patterns and molecular regulatory mechanisms caused by shoot bending during the induced flowering. Here, we examined the transcriptional responses of genes in 'Fuji' apple buds at different flowering stages under a shoot-bending treatment using RNA sequencing. A steady up-regulation of carbon metabolism-related genes led to relatively high levels of sucrose in early induced flowering stages and starch accumulation during shoot bending. Additionally, global gene expression profiling determined that cytokinin, indole-3-acetic acid, gibberellin synthesis and signalling-related genes were significantly regulated by shoot bending, contributing to cell division and differentiation, bud growth and flower induction. A complex genetic crosstalk-regulated network, involving abscisic acid-related genes, starch metabolism- and circadian rhythm-related genes, as well as stress response-related genes, was up-regulated by shoot bending. Additionally, some transcription factor family genes that were involved in sugar, abscisic acid and stress response signalling were significantly induced by shoot bending. These important flowering genes, which were mainly involved in photoperiod, age and autonomous pathways, were up-regulated by shoot bending. Thus, a complex genetic network of regulatory mechanisms involved in sugar, hormone and stress response signalling pathways may mediate the induction of apple tree flowering in response to shoot-bending conditions.
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Affiliation(s)
- Libo Xing
- College of Horticulture, Northwest A & F University, Yangling, 712100, Shaanxi, China
| | - Dong Zhang
- College of Horticulture, Northwest A & F University, Yangling, 712100, Shaanxi, China
| | - Siyan Qi
- College of Horticulture, Northwest A & F University, Yangling, 712100, Shaanxi, China
| | - Xilong Chen
- College of Horticulture, Northwest A & F University, Yangling, 712100, Shaanxi, China
| | - Na An
- College of Horticulture, Northwest A & F University, Yangling, 712100, Shaanxi, China
| | - Youmei Li
- College of Horticulture, Northwest A & F University, Yangling, 712100, Shaanxi, China
| | - Caiping Zhao
- College of Horticulture, Northwest A & F University, Yangling, 712100, Shaanxi, China
| | - Mingyu Han
- College of Horticulture, Northwest A & F University, Yangling, 712100, Shaanxi, China
| | - Juan Zhao
- College of Mechaincal and Electronic Engineering, Northwest A & F University, Yangling, 712100, Shaanxi, China.
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Salentijn EMJ, Petit J, Trindade LM. The Complex Interactions Between Flowering Behavior and Fiber Quality in Hemp. FRONTIERS IN PLANT SCIENCE 2019; 10:614. [PMID: 31156677 PMCID: PMC6532435 DOI: 10.3389/fpls.2019.00614] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 04/25/2019] [Indexed: 05/05/2023]
Abstract
Hemp, Cannabis sativa L., is a sustainable multipurpose fiber crop with high nutrient and water use efficiency and with biomass of excellent quality for textile fibers and construction materials. The yield and quality of hemp biomass are largely determined by the genetic background of the hemp cultivar but are also strongly affected by environmental factors, such as temperature and photoperiod. Hemp is a facultative short-day plant, characterized by a strong adaptation to photoperiod and a great influence of environmental factors on important agronomic traits such as "flowering-time" and "sex determination." This sensitivity of hemp can cause a considerable degree of heterogeneity, leading to unforeseen yield reductions. Fiber quality for instance is influenced by the developmental stage of hemp at harvest. Also, male and female plants differ in stature and produce fibers with different properties and quality. Next to these causes, there is evidence for specific genotypic variation in fiber quality among hemp accessions. Before improved hemp cultivars can be developed, with specific flowering-times and fiber qualities, and adapted to different geographical regions, a better understanding of the molecular mechanisms controlling important phenological traits such as "flowering-time" and "sex determination" in relation to fiber quality in hemp is required. It is well known that genetic factors play a major role in the outcome of both phenological traits, but the major molecular factors involved in this mechanism are not characterized in hemp. Genome sequences and transcriptome data are available but their analysis mainly focused on the cannabinoid pathway for medical purposes. Herein, we review the current knowledge of phenotypic and genetic data available for "flowering-time," "sex determination," and "fiber quality" in short-day and dioecious crops, respectively, and compare them with the situation in hemp. A picture emerges for several controlling key genes, for which natural genetic variation may lead to desired flowering behavior, including examples of pleiotropic effects on yield quality and on carbon partitioning. Finally, we discuss the prospects for using this knowledge for the molecular breeding of this sustainable crop via a candidate gene approach.
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Chen X, Qi S, Zhang D, Li Y, An N, Zhao C, Zhao J, Shah K, Han M, Xing L. Comparative RNA-sequencing-based transcriptome profiling of buds from profusely flowering 'Qinguan' and weakly flowering 'Nagafu no. 2' apple varieties reveals novel insights into the regulatory mechanisms underlying floral induction. BMC PLANT BIOLOGY 2018; 18:370. [PMID: 30577771 PMCID: PMC6303880 DOI: 10.1186/s12870-018-1555-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 11/21/2018] [Indexed: 05/23/2023]
Abstract
BACKGROUND Floral induction is an important stage in the apple tree life cycle. In 'Nagafu No. 2', which was derived from a 'Fuji' bud sport, flower bud formation is associated with serious problems, such as fewer and inferior flower buds, a long juvenile phase, and an alternate bearing phenotype. Moreover, the molecular regulatory mechanisms underlying apple floral induction remain unknown. To characterize these mechanisms, we compared the RNA-sequencing-based transcriptome profiles of buds during floral induction in profusely flowering 'Qinguan' and weakly flowering 'Nagafu No. 2' apple varieties. RESULTS Genes differentially expressed between the buds of the two varieties were mainly related to carbohydrate, fatty acid, and lipid pathways. Additionally, the steady up-regulated expression of genes related to the fatty acid and lipid pathways and the down-regulated expression of starch synthesis-related genes in the carbon metabolic pathway of 'Qinguan' relative to 'Nagafu No. 2' were observed to contribute to the higher flowering rate of 'Qinguan'. Additionally, global gene expression profiling revealed that genes related to cytokinin, indole-3-acetic acid, and gibberellin synthesis, signalling, and responses (i.e., factors contributing to cell division and differentiation and bud growth) were significantly differentially expressed between the two varieties. The up-regulated expression of genes involved in abscisic acid and salicylic acid biosynthesis via shikimate pathways as well as jasmonic acid production through fatty acid pathways in 'Qinguan' buds were also revealed to contribute to the floral induction and relatively high flowering rate of this variety. The differential expression of transcription factor genes (i.e., SPL, bZIP, IDD, and MYB genes) involved in multiple biological processes was also observed to play key roles in floral induction. Finally, important flowering genes (i.e., FT, FD, and AFL) were significantly more highly expressed in 'Qinguan' buds than in 'Nagafu No. 2' buds during floral induction. CONCLUSIONS A complex genetic network of regulatory mechanisms involving carbohydrate, fatty acid, lipid, and hormone pathways may mediate the induction of apple tree flowering.
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Affiliation(s)
- Xilong Chen
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
| | - Siyan Qi
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
| | - Dong Zhang
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
| | - Youmei Li
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
| | - Na An
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
| | - Caiping Zhao
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
| | - Juan Zhao
- College of Mechanical and Electronic Engineering, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
| | - Kamran Shah
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
| | - Mingyu Han
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
| | - Libo Xing
- College of Horticulture, Northwest Agriculture & Forestry University, Yangling, 712100 Shaanxi China
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Tyagi S, Mazumdar PA, Mayee P, Shivaraj SM, Anand S, Singh A, Madhurantakam C, Sharma P, Das S, Kumar A, Singh A. Natural variation in Brassica FT homeologs influences multiple agronomic traits including flowering time, silique shape, oil profile, stomatal morphology and plant height in B. juncea. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2018; 277:251-266. [PMID: 30466591 DOI: 10.1016/j.plantsci.2018.09.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 09/17/2018] [Accepted: 09/21/2018] [Indexed: 06/09/2023]
Abstract
Natural structural variants of regulatory proteins causing quantitative phenotypic consequences have not been reported in plants. Herein, we show that 28 natural structural variants of FT homeologs, isolated from 6 species of Brassica, differ with respect to amino-acid substitutions in regions critical for interactions with FD and represent two evolutionarily distinct categories. Analysis of structural models of selected candidates from Brassica juncea (BjuFT_AAMF1) and Brassica napus (BnaFT_CCLF) predicted stronger binding between BjuFT and Arabidopsis thaliana FD. Over-expression of BjuFT and BnaFT in wild type and ft-10 mutant backgrounds of Arabidopsis validated higher potency of BjuFT in triggering floral transition. Analysis of gain-of-function and artificial miRNA mediated silenced lines of B. juncea implicated Brassica FT in multiple agronomic traits beyond flowering, consistent with a pleiotropic effect. Several dependent and independent traits such as lateral branching, silique shape, seed size, oil-profile, stomatal morphology and plant height were found altered in mutant lines. Enhanced FT levels caused early flowering, which in turn was positively correlated to a higher proportion of desirable fatty acids (PUFA). However, higher FT levels also resulted in altered silique shape and reduced seed size, suggesting trait trade-offs. Modulation of FT levels for achieving optimal balance of trait values and parsing pair-wise interactions among a reportoire of regulatory protein homeologs in polyploid genomes are indeed future areas of crop research.
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Affiliation(s)
- Shikha Tyagi
- Department of Biotechnology, TERI School of Advanced Studies, 10, Institutional Area, Vasant Kunj, New Delhi, 110070, India
| | | | - Pratiksha Mayee
- Department of Biotechnology, TERI School of Advanced Studies, 10, Institutional Area, Vasant Kunj, New Delhi, 110070, India; Department of Research, Ankur Seeds Pvt. Ltd., 27, Nagpur, Maharashtra, 440018, India
| | - S M Shivaraj
- Department of Biotechnology, TERI School of Advanced Studies, 10, Institutional Area, Vasant Kunj, New Delhi, 110070, India; Departement de Phytologie, Université Laval, Quebec City, Quebec, G1V 0A6, Canada
| | - Saurabh Anand
- Department of Botany, University of Delhi, New Delhi, 110007, India
| | - Anupama Singh
- Department of Biotechnology, TERI School of Advanced Studies, 10, Institutional Area, Vasant Kunj, New Delhi, 110070, India
| | - Chaithanya Madhurantakam
- Department of Biotechnology, TERI School of Advanced Studies, 10, Institutional Area, Vasant Kunj, New Delhi, 110070, India
| | - Prateek Sharma
- Department of Energy and Environment, TERI School of Advanced Studies, 10, Institutional Area, Vasant Kunj, New Delhi, 110070, India
| | - Sandip Das
- Department of Botany, University of Delhi, New Delhi, 110007, India
| | - Arun Kumar
- National Phytotron Facility, IARI, New Delhi, 110012, India
| | - Anandita Singh
- Department of Biotechnology, TERI School of Advanced Studies, 10, Institutional Area, Vasant Kunj, New Delhi, 110070, India.
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Song Y, Gan Y, Liu L, Corlett RT. The floral transcriptome of Machilus yunnanensis, a tree in the magnoliid family Lauraceae. Comput Biol Chem 2018; 77:456-465. [DOI: 10.1016/j.compbiolchem.2018.05.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 05/08/2018] [Accepted: 05/09/2018] [Indexed: 01/25/2023]
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Song GQ, Chen Q. Overexpression of the MADS-box gene K-domain increases the yield potential of blueberry. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2018; 276:22-31. [PMID: 30348321 DOI: 10.1016/j.plantsci.2018.07.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 07/18/2018] [Accepted: 07/29/2018] [Indexed: 05/27/2023]
Abstract
MADS-box genes play a significant role for plant flowering. Keratin-like (K) domains are involved in protein-to-protein interactions in the formation of the MIKC-type MADS-box domain proteins. In this study, the potential of utilizing the K domain of a Vaccinium corymbosum SOC1-like gene (VcSOC1K) was investigated to modulate expression of other blueberry MADS-box genes for increasing blueberry productivity. Chilled transgenic blueberry plants overexpressing the VcSOC1K showed a significant increase in the number of canes, floral buds, and flower and fruit clusters compared to chilled non-transgenic plants. Additionally, nonchilled transgenic plants flowered whereas nonchilled non-transgenic plants did not. Transgenic plants showed an increase in tolerance to high soil pH. Comparative transcriptome analysis of transgenic and non-transgenic leaves showed differential expression of 17% of the MADS-box genes identified in blueberry. These differentially expressed (DE) MADS-box genes were associated with genes related to plant flowering, phytohormones, and response to various biotic and abiotic stimuli. The phenotypic changes and the DE MADS-box genes caused by the overexpression of VcSOC1K not only reveal that the MADS-box genes are involved in chilling/vernalization-mediated flowering in blueberry but also demonstrated that the overexpression of the K domain can effectively modulate plant reproductive processes.
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Affiliation(s)
- Guo-Qing Song
- Plant Biotechnology Resource and Outreach Center, Department of Horticulture, Michigan State University, East Lansing, MI 48824, USA.
| | - Qiuxia Chen
- Plant Biotechnology Resource and Outreach Center, Department of Horticulture, Michigan State University, East Lansing, MI 48824, USA
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224
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Rinne PLH, Paul LK, van der Schoot C. Decoupling photo- and thermoperiod by projected climate change perturbs bud development, dormancy establishment and vernalization in the model tree Populus. BMC PLANT BIOLOGY 2018; 18:220. [PMID: 30290771 PMCID: PMC6173867 DOI: 10.1186/s12870-018-1432-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 09/19/2018] [Indexed: 05/20/2023]
Abstract
BACKGROUND The performance and survival of deciduous trees depends on their innate ability to anticipate seasonal change. A key event is the timely production of short photoperiod-induced terminal and axillary buds that are dormant and freezing-tolerant. Some observations suggest that low temperature contributes to terminal bud initiation and dormancy. This is puzzling because low temperatures in the chilling range universally release dormancy. It also raises the broader question if the projected climate instabilities, as well as the northward migration of trees, will affect winter preparations and survival of trees. RESULTS To gauge the response capacity of trees, we exposed juvenile hybrid aspens to a 10-h short photoperiod in combination with different day/night temperature regimes: high (24/24 °C), moderate (18/18 °C), moderate-low (18/12 °C) and low (12/12 °C), and analysed bud development, dormancy establishment, and marker gene expression. We found that low temperature during the bud formation period (pre-dormancy) upregulated dormancy-release genes of the gibberellin (GA) pathway, including the key GA biosynthesis genes GA20oxidase and GA3oxidase, the GA-receptor gene GID1, as well as GA-inducible enzymes of the 1,3-β-glucanase family that degrade callose at plasmodesmal Dormancy Sphincter Complexes. Simultaneously, this pre-dormancy low temperature perturbed the expression of flowering pathway genes, including CO, FT, CENL1, AGL14, LFY and AP1. In brief, pre-dormancy low temperature compromised bud development, dormancy establishment, and potentially vernalization. On the other hand, a high pre-dormancy temperature prevented dormancy establishment and resulted in flushing. CONCLUSIONS The results show that pre-dormancy low temperature represents a form of chilling that antagonizes dormancy establishment. Combined with available field data, this indicates that natural Populus ecotypes have evolved to avoid the adverse effects of high and low temperatures by initiating and completing dormant buds within an approximate temperature-window of 24-12 °C. Global warming and erratic temperature patterns outside this range can therefore endanger the successful propagation of deciduous perennials.
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Affiliation(s)
- Päivi L. H. Rinne
- Faculty of Biosciences, Department of Plant Sciences, Norwegian University of Life Sciences, Christian Magnus Falsens vei 18, 1432 Aas, Norway
| | - Laju K. Paul
- Faculty of Biosciences, Department of Plant Sciences, Norwegian University of Life Sciences, Christian Magnus Falsens vei 18, 1432 Aas, Norway
| | - Christiaan van der Schoot
- Faculty of Biosciences, Department of Plant Sciences, Norwegian University of Life Sciences, Christian Magnus Falsens vei 18, 1432 Aas, Norway
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225
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Hao JH, Zhang LL, Li PP, Sun YC, Li JK, Qin XX, Wang L, Qi ZY, Xiao S, Han YY, Liu CJ, Fan SX. Quantitative Proteomics Analysis of Lettuce ( Lactuca sativa L.) Reveals Molecular Basis-Associated Auxin and Photosynthesis with Bolting Induced by High Temperature. Int J Mol Sci 2018; 19:E2967. [PMID: 30274198 PMCID: PMC6213495 DOI: 10.3390/ijms19102967] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 09/25/2018] [Accepted: 09/26/2018] [Indexed: 12/18/2022] Open
Abstract
Bolting is a key process in the growth and development of lettuce (Lactuca sativa L.). A high temperature can induce early bolting, which decreases both the quality and production of lettuce. However, knowledge of underlying lettuce bolting is still lacking. To better understand the molecular basis of bolting, a comparative proteomics analysis was conducted on lettuce stems, during the bolting period induced by a high temperature (33 °C) and a control temperature (20 °C) using iTRAQ-based proteomics, phenotypic measures, and biological verifications using qRT-PCR and Western blot. The high temperature induced lettuce bolting, while the control temperature did not. Of the 5454 identified proteins, 619 proteins presented differential abundance induced by high-temperature relative to the control group, of which 345 had an increased abundance and 274 had a decreased abundance. Proteins with an abundance level change were mainly enriched in pathways associated with photosynthesis and tryptophan metabolism involved in auxin (IAA) biosynthesis. Moreover, among the proteins with differential abundance, proteins associated with photosynthesis and tryptophan metabolism were increased. These findings indicate that a high temperature enhances the function of photosynthesis and IAA biosynthesis to promote the process of bolting, which is in line with the physiology and transcription level of IAA metabolism. Our data provide a first comprehensive dataset for gaining novel understanding of the molecular basis underlying lettuce bolting induced by high temperature. It is potentially important for further functional analysis and genetic manipulation for molecular breeding to breed new cultivars of lettuce to restrain early bolting, which is vital for improving vegetable quality.
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Affiliation(s)
- Jing-Hong Hao
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Li-Li Zhang
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Pan-Pan Li
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Yan-Chuan Sun
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Jian-Ke Li
- Institute of Apicultural Research, Chinese Academy of Agricultural Science, No. 1 Beigou Xiangshan, Beijing 100093, China.
| | - Xiao-Xiao Qin
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Lu Wang
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Zheng-Yang Qi
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Shuang Xiao
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Ying-Yan Han
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Chao-Jie Liu
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
| | - Shuang-Xi Fan
- Beijing Key Laboratory of New Technology in Agricultural Application, National Demonstration Center for Experimental Plant Production Education, Plant Science and Technology College, Beijing University of Agriculture, Beijing 102206, China.
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226
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Hu T, Wei Q, Wang W, Hu H, Mao W, Zhu Q, Bao C. Genome-wide identification and characterization of CONSTANS-like gene family in radish (Raphanus sativus). PLoS One 2018; 13:e0204137. [PMID: 30248137 PMCID: PMC6152963 DOI: 10.1371/journal.pone.0204137] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 09/04/2018] [Indexed: 12/21/2022] Open
Abstract
Floral induction that initiates bolting and flowering is crucial for reproductive fitness in radishes. CONSTANS-like (CO-like, COL) genes play an important role in the circadian clock, which ensures regular development through complicated time-keeping mechanisms. However, the specific biological and functional roles of each COL transcription factor gene in the radish remain unknown. In this study, we performed a genome-wide identification of COL genes in the radish genome of three cultivars including ‘Aokubi’, ‘kazusa’ and ‘WK10039’, and we analyzed their exon-intron structure, gene phylogeny and synteny, and expression levels in different tissues. The bioinformatics analysis identified 20 COL transcription factors in the radish genome, which were divided into three subgroups (Group I to Group III). RsaCOL-09 and RsaCOL-12 might be tandem duplicated genes, whereas the others may have resulted from segmental duplication. The Ka/Ks ratio indicated that all the COL genes in radish, Arabidopsis, Brassica rapa, Brassica oleracea, Capsella rubella and rice were under purifying selection. We identified 6 orthologous and 19 co-orthologous COL gene pairs between the radish and Arabidopsis, and we constructed an interaction network among these gene pairs. The expression values for each COL gene during vegetable and flower development showed that the majority of Group I members had similar expression patterns. In general, the expression of radish COL genes in Groups I and III decreased during development, whereas the expression of radish COL genes in Group II first increased and then decreased. Substantial numbers of radish COL genes were differentially expressed after vernalization treatment. The expression levels of RsaCOL-02 and RsaCOL-04 were significantly increased during vernalization treatment, while the expression of RsaCOL-10 was significantly decreased. These outcomes provide insights for improving the genetic control of bolting and flowering in radish and other root vegetable crops, and they facilitate genetic improvements to radish yields and quality.
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Affiliation(s)
- Tianhua Hu
- Institute of Vegetable, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Qingzhen Wei
- Institute of Vegetable, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Wuhong Wang
- Institute of Vegetable, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Haijiao Hu
- Institute of Vegetable, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Weihai Mao
- Institute of Vegetable, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Qinmei Zhu
- Institute of Vegetable, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Chonglai Bao
- Institute of Vegetable, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
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227
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Wang Z, Zhu T, Ma W, Wang N, Qu G, Zhang S, Wang J. Genome-wide analysis of long non-coding RNAs in Catalpa bungei and their potential function in floral transition using high-throughput sequencing. BMC Genet 2018; 19:86. [PMID: 30236060 PMCID: PMC6149005 DOI: 10.1186/s12863-018-0671-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 09/10/2018] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Long non-coding RNAs (lncRNAs) have crucial roles in various biological regulatory processes. However, the study of lncRNAs is limited in woody plants. Catalpa bungei is a valuable ornamental tree with a long cultivation history in China, and a deeper understanding of the floral transition mechanism in C. bungei would be interesting from both economic and scientific perspectives. RESULTS In this study, we categorized C. bungei buds from early flowering (EF) and normal flowering (NF) varieties into three consecutive developmental stages. These buds were used to systematically study lncRNAs during floral transition using high-throughput sequencing to identify molecular regulatory networks. Quantitative real-time PCR was performed to study RNA expression changes in different stages. In total, 12,532 lncRNAs and 26,936 messenger RNAs (mRNAs) were detected. Moreover, 680 differentially expressed genes and 817 differentially expressed lncRNAs were detected during the initiation of floral transition. The results highlight the mRNAs and lncRNAs that may be involved in floral transition, as well as the many lncRNAs serving as microRNA precursors. We predicted the functions of lncRNAs by analysing the relationships between lncRNAs and mRNAs. Seven lncRNA-mRNA interaction pairs may participate in floral transition. CONCLUSIONS This study is the first to identify lncRNAs and their potential functions in floral transition, providing a starting point for detailed determination of the functions of lncRNAs in C. bungei.
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Affiliation(s)
- Zhi Wang
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Haidian District, Dongxiaofu 1#, Beijing, 100091 People’s Republic of China
| | - Tianqing Zhu
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Haidian District, Dongxiaofu 1#, Beijing, 100091 People’s Republic of China
| | - Wenjun Ma
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Haidian District, Dongxiaofu 1#, Beijing, 100091 People’s Republic of China
| | - Nan Wang
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Haidian District, Dongxiaofu 1#, Beijing, 100091 People’s Republic of China
| | - Guanzheng Qu
- State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), 26 Hexing Road, Harbin, 150040 People’s Republic of China
| | - Shougong Zhang
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Haidian District, Dongxiaofu 1#, Beijing, 100091 People’s Republic of China
| | - Junhui Wang
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Haidian District, Dongxiaofu 1#, Beijing, 100091 People’s Republic of China
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Wu M, Upreti S, Yan A, Wakeel A, Wu J, Ge S, Liu Y, Liu B, Gan Y. SPATULA regulates floral transition and photomorphogenesis in a PHYTOCHROME B-dependent manner in Arabidopsis. Biochem Biophys Res Commun 2018; 503:2380-2385. [PMID: 29966653 DOI: 10.1016/j.bbrc.2018.06.165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 06/28/2018] [Indexed: 11/16/2022]
Abstract
Light is the most important exogenous stimulus regulating plant growth and various developmental processes. Phytochromes, especially PHYTOCHROME B (PHYB) mediates the various light-mediated processes in Arabidopsis. SPATULA (SPT) is an important transcription factor, which has been reported previously to participate in temperature-mediated transition from seed dormancy to germination. Here we investigate the function of SPT in the floral transition under long day conditions and photomorphogenesis in Arabidopsis. In this study, spt-2 shows significantly delayed flowering time. But mutation of SPT in the background of phyb-1 rescues the phenotype of spt-2. The flowering time of double mutant of spt-2/phyb-1 is similar with the wild type. These results indicate that SPT promotes the transition from vegetative stage to floral stage and it regulates this transition in a PHYB-dependent manner. With qRT-PCR analysis, it is found that SPT regulates flowering time via FLC, SVP, FT and SOC1. Furthermore, SPT also controls photomorphogenesis. spt-2 displays shortened hypocotyls and increased chlorophylls contents compared with the wild type. These phenotypes are also rescued in the double mutant of spt-2/phyb-1. These results indicate that SPT is also involved in photomorphogenic development in Arabidopsis and SPT regulates photomorphogenesis in a PHYB-dependent manner. Collectively, SPT is not only a temperature responder but it is also an important light regulator during plant growth and development.
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Affiliation(s)
- Minjie Wu
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Sakila Upreti
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - An Yan
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore, 637616, Singapore
| | - Abdul Wakeel
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Junyu Wu
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Song Ge
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Yihua Liu
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Bohan Liu
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China
| | - Yinbo Gan
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China.
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229
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Ding F, Zhang S, Chen H, Peng H, Lu J, He X, Pan J. Functional analysis of a homologue of the FLORICAULA/LEAFY gene in litchi (Litchi chinensis Sonn.) revealing its significance in early flowering process. Genes Genomics 2018; 40:10.1007/s13258-018-0739-4. [PMID: 30218346 DOI: 10.1007/s13258-018-0739-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 05/30/2017] [Indexed: 10/28/2022]
Abstract
Litchi (Litchi chinensis Sonn.) is an important subtropical fruit crop with high commercial value due to its high nutritional values and favorable tastes. However, irregular bearing attributed to unstable flowering is a major ongoing problem for litchi producers. Previous studies indicate that low-temperature is a key factor in litchi floral induction. In order to reveal the genetic and molecular mechanisms underlying the reproductive process in litchi, we had analyzed the transcriptome of buds before and after low-temperature induction using RNA-seq technology. A key flower bud differentiation associated gene, a homologue of FLORICAULA/LEAFY, was identified and named LcLFY (GenBank Accession No. KF008435). The cDNA sequence of LcLFY encodes a putative protein of 388 amino acids. To gain insight into the role of LcLFY, the temporal expression level of this gene was measured by real-time RT-PCR. LcLFY was highly expressed in flower buds and its expression correlated with the floral developmental stage. Heterologous expression of LcLFY in transgenic tobacco plants induced precocious flowering. Meantime, we investigated the sub-cellular localization of LcLFY. The LcLFY-Green fluorescent protein (GFP) fusion protein was found in the nucleus. The results suggest that LcLFY plays a pivotal role as a transcription factor in controlling the transition to flowering and in the development of floral organs in litchi.
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Affiliation(s)
- Feng Ding
- Horticultural Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, 530007, Guangxi, People's Republic of China
- Agricultural College, Guangxi University, Nanning, 530004, Guangxi, People's Republic of China
| | - Shuwei Zhang
- Horticultural Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, 530007, Guangxi, People's Republic of China
| | - Houbin Chen
- Horticulture College, South China Agricultural University, Guangzhou, 510642, Guangdong, People's Republic of China.
| | - Hongxiang Peng
- Horticultural Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, 530007, Guangxi, People's Republic of China
| | - Jiang Lu
- Guangxi Crop Genetic Improvement and Biotechnology Laboratory, Guangxi Academy of Agricultural Sciences, Nanning, 530007, Guangxi, People's Republic of China.
| | - Xinhua He
- Agricultural College, Guangxi University, Nanning, 530004, Guangxi, People's Republic of China
| | - Jiechun Pan
- Agricultural College, Guangxi University, Nanning, 530004, Guangxi, People's Republic of China
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230
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Jaudal M, Zhang L, Che C, Li G, Tang Y, Wen J, Mysore KS, Putterill J. A SOC1-like gene MtSOC1a promotes flowering and primary stem elongation in Medicago. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:4867-4880. [PMID: 30295903 PMCID: PMC6137972 DOI: 10.1093/jxb/ery284] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 07/10/2018] [Indexed: 05/19/2023]
Abstract
Medicago flowering, like that of Arabidopsis, is promoted by vernalization and long days, but alternative mechanisms are predicted because Medicago lacks the key regulators CO and FLC. Three Medicago SOC1-like genes, including MtSOC1a, were previously implicated in flowering control, but no legume soc1 mutants with altered flowering were reported. Here, reverse transciption-quantitative PCR (RT-qPCR) indicated that the timing and magnitude of MtSOC1a expression was regulated by the flowering promoter FTa1, while in situ hybridization indicated that MtSOC1a expression increased in the shoot apical meristem during the floral transition. A Mtsoc1a mutant showed delayed flowering and short primary stems. Overexpression of MtSOC1a partially rescued the flowering of Mtsoc1a, but caused a dramatic increase in primary stem height, well before the transition to flowering. Internode cell length correlated with stem height, indicating that MtSOC1a promotes cell elongation in the primary stem. However, application of gibberellin (GA3) caused stem elongation in both the wild type and Mtsoc1a, indicating that the mutant was not defective in gibberellin responsiveness. These results indicate that MtSOC1a may function as a floral integrator gene and promotes primary stem elongation. Overall, this study suggests that apart from some conservation with the Arabidopsis flowering network, MtSOC1a has a novel role in regulating aspects of shoot architecture.
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Affiliation(s)
- Mauren Jaudal
- Flowering Lab, School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Lulu Zhang
- Flowering Lab, School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Chong Che
- Flowering Lab, School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Guifen Li
- Noble Research Institute, LLC, Ardmore, OK, USA
| | - Yuhong Tang
- Noble Research Institute, LLC, Ardmore, OK, USA
| | - Jiangqi Wen
- Noble Research Institute, LLC, Ardmore, OK, USA
| | | | - Joanna Putterill
- Flowering Lab, School of Biological Sciences, University of Auckland, Auckland, New Zealand
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231
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Song J, Zhang Y, Song S, Su W, Chen R, Sun G, Hao Y, Liu H. Comparative RNA-Seq analysis on the regulation of cucumber sex differentiation under different ratios of blue and red light. BOTANICAL STUDIES 2018; 59:21. [PMID: 30203294 PMCID: PMC6131680 DOI: 10.1186/s40529-018-0237-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 08/27/2018] [Indexed: 05/13/2023]
Abstract
Cucumber (Cucumis sativus L.) is a typical monoecism vegetable with individual male and female flowers, which has been used as a plant model for sex determination. It is well known that light is one of the most important environmental stimuli, which control the timing of the transition from vegetative growth to reproductive development. However, whether light controls sex determination remains elusive. To unravel this problem, we performed high-throughput RNA-Seq analyses, which compared the transcriptomes of shoot apices between R2B1(Red light:Blue light = 2:1)-treated and R4B1(Red light:Blue light = 4:1)-treated cucumber seedlings. Results showed that the higher proportion of blue light in the R2B1 treatment significantly induced the formation of female flowers and accelerated female flowering time in this whole study. The genes related to flowering time, such as flowering locus T (FT) and SUPPRESSOR OF OVEREXPRESSION OF CO1 (SOC1), were up-regulated after R2B1 treatment. Furthermore, the transcriptome analysis showed that up-regulation and down-regulation of specific DEGs (the differentially expressed genes) were primarily the result of plant hormone signal transduction after treatments. The specific DEGs related with auxin formed the highest percentage of DEGs in the plant hormone signal transduction. In addition, the expression levels of transcription factors also changed after R2B1 treatment. Thus, sex differentiation affected by light quality might be induced by plant hormone signal transduction and transcription factors. These results provide a theoretical basis for further investigation of the regulatory mechanism of female flower formation under different light qualities in cucumber seedlings.
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Affiliation(s)
- Jiali Song
- College of Horticulture, South China Agricultural University, Guangzhou, 510642 China
| | - Yiting Zhang
- College of Horticulture, South China Agricultural University, Guangzhou, 510642 China
| | - Shiwei Song
- College of Horticulture, South China Agricultural University, Guangzhou, 510642 China
| | - Wei Su
- College of Horticulture, South China Agricultural University, Guangzhou, 510642 China
| | - Riyuan Chen
- College of Horticulture, South China Agricultural University, Guangzhou, 510642 China
| | - Guangwen Sun
- College of Horticulture, South China Agricultural University, Guangzhou, 510642 China
| | - Yanwei Hao
- College of Horticulture, South China Agricultural University, Guangzhou, 510642 China
| | - Houcheng Liu
- College of Horticulture, South China Agricultural University, Guangzhou, 510642 China
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232
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An N, Fan S, Yang Y, Chen X, Dong F, Wang Y, Xing L, Zhao C, Han M. Identification and Characterization of miRNAs in Self-Rooted and Grafted Malus Reveals Critical Networks Associated with Flowering. Int J Mol Sci 2018; 19:E2384. [PMID: 30104536 PMCID: PMC6121270 DOI: 10.3390/ijms19082384] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/03/2018] [Accepted: 08/09/2018] [Indexed: 11/24/2022] Open
Abstract
Grafting can improve the agricultural traits of crop plants, especially fruit trees. However, the regulatory networks and differentially expressed microRNAs (miRNAs) related to grafting in apple remain unclear. Herein, we conducted high-throughput sequencing and identified differentially expressed miRNAs among self-rooted Fuji, self-rooted M9, and grafted Fuji/M9. We analyzed the flowering rate, leaf morphology, and nutrient and carbohydrate contents in the three materials. The flowering rate, element and carbohydrate contents, and expression levels of flowering genes were higher in Fuji/M9 than in Fuji. We detected 206 known miRNAs and 976 novel miRNAs in the three materials, and identified those that were up- or downregulated in response to grafting. miR156 was most abundant in Fuji, followed by Fuji/M9, and then self-rooted M9, while miR172 was most abundant in M9, followed by Fuji/M9, and then Fuji. These expression patterns suggest that that these miRNAs were related to grafting. A Gene Ontology (GO) analysis showed that the differentially expressed miRNAs controlled genes involved in various biological processes, including cellular biosynthesis and metabolism. The expression of differentially expressed miRNAs and flowering-related genes was verified by qRT-PCR. Altogether, this comprehensive analysis of miRNAs related to grafting provides valuable information for breeding and grafting of apple and other fruit trees.
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Affiliation(s)
- Na An
- College of Horticulture, Northwest A&F University, Yangling 712100, Shannxi, China.
- College of Life Science, Northwest A&F University, Yangling 712100, Shaanxi, China.
| | - Sheng Fan
- College of Horticulture, Northwest A&F University, Yangling 712100, Shannxi, China.
| | - Yang Yang
- Innovation Experimental College, Northwest A&F University, Yangling 712100, Shaanxi, China.
| | - Xilong Chen
- College of Horticulture, Northwest A&F University, Yangling 712100, Shannxi, China.
| | - Feng Dong
- College of Horticulture, Northwest A&F University, Yangling 712100, Shannxi, China.
| | - Yibin Wang
- College of Horticulture, Northwest A&F University, Yangling 712100, Shannxi, China.
| | - Libo Xing
- College of Horticulture, Northwest A&F University, Yangling 712100, Shannxi, China.
| | - Caiping Zhao
- College of Horticulture, Northwest A&F University, Yangling 712100, Shannxi, China.
| | - Mingyu Han
- College of Horticulture, Northwest A&F University, Yangling 712100, Shannxi, China.
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233
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Chen Z, Zhao W, Ge D, Han Y, Ning K, Luo C, Wang S, Liu R, Zhang X, Wang Q. LCM-seq reveals the crucial role of LsSOC1 in heat-promoted bolting of lettuce (Lactuca sativa L.). THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2018; 95:516-528. [PMID: 29772090 DOI: 10.1111/tpj.13968] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 04/26/2018] [Accepted: 05/02/2018] [Indexed: 05/08/2023]
Abstract
Lettuce (Lactuca sativa L.) is one of the most economically important vegetables. The floral transition in lettuce is accelerated under high temperatures, which can significantly decrease yields. However, the molecular mechanism underlying the floral transition in lettuce is poorly known. Using laser capture microdissection coupled with RNA sequencing, we isolated shoot apical meristem cells from the bolting-sensitive lettuce line S39 at four critical stages of development. Subsequently, we screened specifically for the flowering-related gene LsSOC1 during the floral transition through comparative transcriptomic analysis. Molecular biology, developmental biology, and biochemical tools were combined to investigate the biological function of LsSOC1 in lettuce. LsSOC1 knockdown by RNA interference resulted in a significant delay in the timing of bolting and insensitivity to high temperature, which indicated that LsSOC1 functions as an activator during heat-promoted bolting in lettuce. We determined that two heat shock transcription factors, HsfA1e and HsfA4c, bound to the promoter of LsSOC1 to confirm that LsSOC1 played an important role in heat-promoted bolting. This study indicates that LsSOC1 plays a crucial role in the heat-promoted bolting process in lettuce. Further investigation of LsSOC1 may be useful for clarification of the bolting mechanism in lettuce.
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Affiliation(s)
- Zijing Chen
- Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing, 100193, China
| | - Wensheng Zhao
- Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing, 100193, China
| | - Danfeng Ge
- Shanghai Center for Plant Stress Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
- University of Chinese Academy of Sciences, Beijing, 100094, China
| | - Yingyan Han
- Plant Science and Technology College, Beijing University of Agriculture/New Technological Laboratory in Agriculture Application in Beijing, Beijing, 102206, China
| | - Kang Ning
- Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing, 100193, China
| | - Chen Luo
- Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing, 100193, China
| | - Shenglin Wang
- Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing, 100193, China
| | - Renyi Liu
- College of Horticulture and FAFU-UCR Joint Center for Horticultural Biology and Metabolomics, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Xiaolan Zhang
- Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing, 100193, China
| | - Qian Wang
- Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing, 100193, China
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234
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Anderson JV, Horvath DP, Doğramaci M, Dorn KM, Chao WS, Watkin EE, Hernandez AG, Marks MD, Gesch R. Expression of FLOWERING LOCUS C and a frameshift mutation of this gene on chromosome 20 differentiate a summer and winter annual biotype of Camelina sativa. PLANT DIRECT 2018; 2:e00060. [PMID: 31245730 PMCID: PMC6508819 DOI: 10.1002/pld3.60] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 04/04/2018] [Accepted: 04/30/2018] [Indexed: 06/09/2023]
Abstract
The nature of the vegetative to reproductive transition in the shoot apical meristem of Camelina sativa summer annual cultivar CO46 and winter annual cultivar Joelle was confirmed by treating seedlings with or without 8 weeks of vernalization. True to their life cycle classification, Joelle required a vernalization treatment to induce bolting and flowering, whereas CO46 did not. In this study, whole genome sequence, RNAseq, and resequencing of PCR-amplified transcripts for a key floral repressor were used to better understand factors involved in the flowering habit of summer and winter biotypes at the molecular level. Analysis of transcriptome data indicated that abundance for one of the three genes encoding the floral repressor FLOWERING LOCUS C (FLC; Csa20 g015400) was 16-fold greater in Joelle compared to CO46 prior to vernalization. Abundance of this transcript decreased only slightly in CO46 postvernalization, compared to a substantial decrease in Joelle. The results observed in the winter annual biotype Joelle are consistent with repression of FLC by vernalization. Further characterization of FLC at both the genome and transcriptome levels identified a one base deletion in the 5th exon coding for a keratin-binding domain in chromosome 20 of CO46 and Joelle. The one base deletion detected in chromosome 20 FLC is predicted to result in a frameshift that would produce a nonfunctional protein. Analysis of whole genome sequence indicated that the one base deletion in chromosome 20 FLC occurred at a greater ratio in the summer biotype CO46 (2:1) compared to the winter biotype Joelle (1:4); similar trends were also observed for RNAseq and cDNA transcripts mapping to chromosome 20 FLC of CO46 and Joelle.
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Affiliation(s)
- James V. Anderson
- Sunflower and Plant Biology Research UnitUSDA‐ARS, Red River Valley Agricultural Research CenterFargoNorth Dakota
| | - David P. Horvath
- Sunflower and Plant Biology Research UnitUSDA‐ARS, Red River Valley Agricultural Research CenterFargoNorth Dakota
| | - Münevver Doğramaci
- Sunflower and Plant Biology Research UnitUSDA‐ARS, Red River Valley Agricultural Research CenterFargoNorth Dakota
- Sanford School of MedicineInternal Medicine DepartmentUniversity of South DakotaSioux FallsSouth Dakota
| | - Kevin M. Dorn
- Department of Plant PathologyKansas State UniversityManhattanKansas
| | - Wun S. Chao
- Sunflower and Plant Biology Research UnitUSDA‐ARS, Red River Valley Agricultural Research CenterFargoNorth Dakota
| | - Erin E. Watkin
- Sunflower and Plant Biology Research UnitUSDA‐ARS, Red River Valley Agricultural Research CenterFargoNorth Dakota
| | - Alvaro G. Hernandez
- Department of Crop Sciences2608 Institute for Genomic Biology, and Roy J. Carver Biotechnology CenterUniversity of IllinoisUrbanaIllinois
| | - M. David Marks
- Department of Plant BiologyUniversity of MinnesotaSt. PaulMinnesota
| | - Russ Gesch
- USDA‐ARS, North Central Soil Conservation Research LaboratoryMorrisMinnesota
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235
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Tyagi S, Sri T, Singh A, Mayee P, Shivaraj SM, Sharma P, Singh A. SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 influences flowering time, lateral branching, oil quality, and seed yield in Brassica juncea cv. Varuna. Funct Integr Genomics 2018; 19:43-60. [DOI: 10.1007/s10142-018-0626-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 06/15/2018] [Accepted: 06/18/2018] [Indexed: 01/18/2023]
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236
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Nardeli SM, Artico S, Aoyagi GM, de Moura SM, da Franca Silva T, Grossi-de-Sa MF, Romanel E, Alves-Ferreira M. Genome-wide analysis of the MADS-box gene family in polyploid cotton (Gossypium hirsutum) and in its diploid parental species (Gossypium arboreum and Gossypium raimondii). PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2018; 127:169-184. [PMID: 29604523 DOI: 10.1016/j.plaphy.2018.03.019] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 02/27/2018] [Accepted: 03/18/2018] [Indexed: 06/08/2023]
Abstract
The MADS-box gene family encodes transcription factors that share a highly conserved domain known to bind to DNA. Members of this family control various processes of development in plants, from root formation to fruit ripening. In this work, a survey of diploid (Gossypium raimondii and Gossypium arboreum) and tetraploid (Gossypium hirsutum) cotton genomes found a total of 147, 133 and 207 MADS-box genes, respectively, distributed in the MIKC, Mα, Mβ, Mγ, and Mδ subclades. A comparative phylogenetic analysis among cotton species, Arabidopsis, poplar and grapevine MADS-box homologous genes allowed us to evaluate the evolution of each MADS-box lineage in cotton plants and identify sequences within well-established subfamilies. Chromosomal localization and phylogenetic analysis revealed that G. raimondii and G. arboreum showed a conserved evolution of the MIKC subclade and a distinct pattern of duplication events in the Mα, Mγ and Mδ subclades. Additionally, G. hirsutum showed a combination of its parental subgenomes followed by a distinct evolutionary history including gene gain and loss in each subclade. qPCR analysis revealed the expression patterns of putative homologs in the AP1, AP3, AGL6, SEP4, AGL15, AG, AGL17, TM8, SVP, SOC and TT16 subfamilies of G. hirsutum. The identification of putative cotton orthologs is discussed in the light of evolution and gene expression data from other plants. This analysis of the MADS-box genes in Gossypium species opens an avenue to understanding the origin and evolution of each gene subfamily within diploid and polyploid species and paves the way for functional studies in cotton species.
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Affiliation(s)
- Sarah Muniz Nardeli
- Laboratório de Genética Molecular Vegetal, Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro (UFRJ), CEP 21941-617, Rio de Janeiro, RJ, Brazil.
| | - Sinara Artico
- Laboratório de Genética Molecular Vegetal, Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro (UFRJ), CEP 21941-617, Rio de Janeiro, RJ, Brazil.
| | - Gustavo Mitsunori Aoyagi
- Departamento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo (EEL-USP), CEP 12602-810, Lorena, SP, Brazil.
| | - Stéfanie Menezes de Moura
- Laboratório de Genética Molecular Vegetal, Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro (UFRJ), CEP 21941-617, Rio de Janeiro, RJ, Brazil.
| | - Tatiane da Franca Silva
- Departamento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo (EEL-USP), CEP 12602-810, Lorena, SP, Brazil.
| | | | - Elisson Romanel
- Departamento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo (EEL-USP), CEP 12602-810, Lorena, SP, Brazil.
| | - Marcio Alves-Ferreira
- Laboratório de Genética Molecular Vegetal, Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro (UFRJ), CEP 21941-617, Rio de Janeiro, RJ, Brazil.
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237
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Wu M, Liu D, Abdul W, Upreti S, Liu Y, Song G, Wu J, Liu B, Gan Y. PIL5 represses floral transition in Arabidopsis under long day conditions. Biochem Biophys Res Commun 2018; 499:513-518. [PMID: 29588173 DOI: 10.1016/j.bbrc.2018.03.179] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 03/23/2018] [Indexed: 11/17/2022]
Abstract
PHYTOCHROME INTERACING FACTOR 3 LIKE 5 (PIL5), also named PHYTOCHROME INTERACTING FACTOR 1 (PIF1) is an important b-HLH transcription factor in Arabidopsis thaliana. Here we show that mutant of pil5-1 displays early flowering phenotype. We demonstrate that the expressions of the major flowering promoter genes [FLOWERING LOCUS T (FT), SUPPRESOR OF OVEREXPRESSION OF CO 1 (SOC1), and LEAFY (LFY)] are upregulated in the mutant of pil5-1. There is a significant increase of the mRNA of PIL5 in the mutants of co2-1, ft-10, soc1-2, and lfy-4. These changes provide the molecular evidence that PIL5 interacts with the flowering regulators to control flowering time. Moreover, it is shown in our results that PIL5 mutation mediates the increased contents of gibberellic acid (GA). Which is further supported by the qRT-PCR analysis, an increased transcriptome level of the GA biosynthesis genes (GA3ox1, GA3ox2, GA20ox1, GA20ox2, and GA20ox3) has been observed in the pil5-1 mutants as compared to the wild type. Collectively, PIL5 is involved in floral transition interacting with flowering integrators and GA.
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Affiliation(s)
- Minjie Wu
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Dongdong Liu
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Wakeel Abdul
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Sakila Upreti
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Yihua Liu
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Ge Song
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Junyu Wu
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Bohan Liu
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Yinbo Gan
- Zhejiang Key Lab of Crop Germplasm, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China.
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238
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Laricchia KM, Johnson MG, Ragone D, Williams EW, Zerega NJC, Wickett NJ. A transcriptome screen for positive selection in domesticated breadfruit and its wild relatives (Artocarpus spp.). AMERICAN JOURNAL OF BOTANY 2018; 105:915-926. [PMID: 29882953 DOI: 10.1002/ajb2.1095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Accepted: 03/12/2018] [Indexed: 06/08/2023]
Abstract
PREMISE OF THE STUDY Underutilized crops, such as breadfruit (Artocarpus altilis, Moraceae) have the potential to improve global food security. Humans have artificially selected many cultivars of breadfruit since its domestication began approximately 3500 years ago. The goal of this research was to identify transcriptomic signals of positive selection and to develop genomic resources that may facilitate the development of improved breadfruit cultivars in the future. METHODS A reference transcriptome of breadfruit was assembled de novo and annotated. Twenty-four transcriptomes of breadfruit and its wild relatives were generated and analyzed to reveal signals of positive selection that may have resulted from local adaptation or natural selection. Emphasis was placed on MADS-box genes, which are important because they often regulate fruiting timing and structures, and on carotenoid biosynthesis genes, which can impact the nutritional quality of the fruit. KEY RESULTS Over 1000 genes showed signals of positive selection, and these genes were enriched for localization to plastids. Nucleotide sites and individuals under positive selection were discovered in MADS-box genes and carotenoid biosynthesis genes, with several sites located in cofactor or DNA-binding domains. A McDonald-Kreitman test comparing wild to cultivated samples revealed selection in one of the carotenoid biosynthesis genes, abscisic acid 8'-hydroxylase 3. CONCLUSIONS This research highlights some of the many genes that may have been intentionally or unintentionally selected for during the human-mediated dispersal of breadfruit and stresses the importance of conserving a varied germplasm collection. It has revealed candidate genes for further study and produced new genomic resources for breadfruit.
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Affiliation(s)
- Kristen M Laricchia
- Program in Plant Biology and Conservation, Northwestern University, Evanston, IL, 60208, USA
- Department of Plant Science, Chicago Botanic Garden, Glencoe, IL, 60022, USA
| | - Matthew G Johnson
- Department of Plant Science, Chicago Botanic Garden, Glencoe, IL, 60022, USA
| | - Diane Ragone
- Breadfruit Institute, National Tropical Botanical Garden, Kalaheo, HI, 96741, USA
| | - Evelyn W Williams
- Department of Plant Science, Chicago Botanic Garden, Glencoe, IL, 60022, USA
| | - Nyree J C Zerega
- Program in Plant Biology and Conservation, Northwestern University, Evanston, IL, 60208, USA
- Department of Plant Science, Chicago Botanic Garden, Glencoe, IL, 60022, USA
| | - Norman J Wickett
- Program in Plant Biology and Conservation, Northwestern University, Evanston, IL, 60208, USA
- Department of Plant Science, Chicago Botanic Garden, Glencoe, IL, 60022, USA
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239
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Transcriptomic Analysis of Flower Bud Differentiation in Magnolia sinostellata. Genes (Basel) 2018; 9:genes9040212. [PMID: 29659525 PMCID: PMC5924554 DOI: 10.3390/genes9040212] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 04/08/2018] [Accepted: 04/11/2018] [Indexed: 01/21/2023] Open
Abstract
Magnolias are widely cultivated for their beautiful flowers, but despite their popularity, the molecular mechanisms regulating flower bud differentiation have not been elucidated. Here, we used paraffin sections and RNA-seq to study the process of flower bud differentiation in Magnolia sinostellata. Flower bud development occurred between 28 April and 30 May 2017 and was divided into five stages: undifferentiated, early flower bud differentiation, petal primordium differentiation, stamen primordium differentiation, and pistil primordium differentiation. A total of 52,441 expressed genes were identified, of which 11,592 were significantly differentially expressed in the five bud development stages. Of these, 82 genes were involved in the flowering. In addition, MADS-box and AP2 family genes play critical roles in the formation of flower organs and 20 differentially expressed genes associated with flower bud differentiation were identified in M. sinostellata. A qRT-PCR analysis verified that the MADS-box and AP2 family genes were expressed at high levels during flower bud differentiation. Consequently, this study provides a theoretical basis for the genetic regulation of flowering in M. sinostellata, which lays a foundation for further research into flowering genes and may facilitate the development of new cultivars.
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240
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Identification and Characterization of the MADS-Box Genes and Their Contribution to Flower Organ in Carnation (Dianthus caryophyllus L.). Genes (Basel) 2018; 9:genes9040193. [PMID: 29617274 PMCID: PMC5924535 DOI: 10.3390/genes9040193] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 03/22/2018] [Accepted: 03/22/2018] [Indexed: 01/22/2023] Open
Abstract
Dianthus is a large genus containing many species with high ornamental economic value. Extensive breeding strategies permitted an exploration of an improvement in the quality of cultivated carnation, particularly in flowers. However, little is known on the molecular mechanisms of flower development in carnation. Here, we report the identification and description of MADS-box genes in carnation (DcaMADS) with a focus on those involved in flower development and organ identity determination. In this study, 39 MADS-box genes were identified from the carnation genome and transcriptome by the phylogenetic analysis. These genes were categorized into four subgroups (30 MIKCc, two MIKC*, two Mα, and five Mγ). The MADS-box domain, gene structure, and conserved motif compositions of the carnation MADS genes were analysed. Meanwhile, the expression of DcaMADS genes were significantly different in stems, leaves, and flower buds. Further studies were carried out for exploring the expression of DcaMADS genes in individual flower organs, and some crucial DcaMADS genes correlated with their putative function were validated. Finally, a new expression pattern of DcaMADS genes in flower organs of carnation was provided: sepal (three class E genes and two class A genes), petal (two class B genes, two class E genes, and one SHORT VEGETATIVE PHASE (SVP)), stamen (two class B genes, two class E genes, and two class C), styles (two class E genes and two class C), and ovary (two class E genes, two class C, one AGAMOUS-LIKE 6 (AGL6), one SEEDSTICK (STK), one B sister, one SVP, and one Mα). This result proposes a model in floral organ identity of carnation and it may be helpful to further explore the molecular mechanism of flower organ identity in carnation.
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241
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Lee CR, Hsieh JW, Schranz ME, Mitchell-Olds T. The Functional Change and Deletion of FLC Homologs Contribute to the Evolution of Rapid Flowering in Boechera stricta. FRONTIERS IN PLANT SCIENCE 2018; 9:1078. [PMID: 30108602 PMCID: PMC6080596 DOI: 10.3389/fpls.2018.01078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 07/03/2018] [Indexed: 05/04/2023]
Abstract
Differences in the timing of vegetative-to-reproductive phase transition have evolved independently and repeatedly in different plant species. Due to their specific biological functions and positions in pathways, some genes are important targets of repeated evolution - independent mutations on these genes caused the evolution of similar phenotypes in distantly related organisms. While many studies have investigated these genes, it remains unclear how gene duplications influence repeated phenotypic evolution. Here we characterized the genetic architecture underlying a novel rapid-flowering phenotype in Boechera stricta and investigated the candidate genes BsFLC1 and BsFLC2. The expression patterns of BsFLC1 suggested its function in flowering time suppression, and the deletion of BsFLC1 is associated with rapid flowering and loss of vernalization requirement. In contrast, BsFLC2 did not appear to be associated with flowering and had accumulated multiple amino acid substitutions in the relatively short evolutionary timeframe after gene duplication. These non-synonymous substitutions greatly changed the physicochemical properties of the original amino acids, concentrated non-randomly near a protein-interacting domain, and had greater substitution rate than synonymous changes. Here we suggested that, after recent gene duplication of the FLC gene, the evolution of rapid phenology was made possible by the change of BsFLC2 expression pattern or protein sequences and the deletion of BsFLC1.
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Affiliation(s)
- Cheng-Ruei Lee
- Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei, Taiwan
- Institute of Plant Biology, National Taiwan University, Taipei, Taiwan
- Genome and Systems Biology Degree Program, National Taiwan University, Taipei, Taiwan
- *Correspondence: Cheng-Ruei Lee,
| | - Jo-Wei Hsieh
- Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei, Taiwan
| | - M. E. Schranz
- Biosystematics Group, Wageningen University & Research, Wageningen, Netherlands
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242
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Leeggangers HACF, Rosilio-Brami T, Bigas-Nadal J, Rubin N, van Dijk ADJ, Nunez de Caceres Gonzalez FF, Saadon-Shitrit S, Nijveen H, Hilhorst HWM, Immink RGH, Zaccai M. Tulipa gesneriana and Lilium longiflorum PEBP Genes and Their Putative Roles in Flowering Time Control. PLANT & CELL PHYSIOLOGY 2018; 59:90-106. [PMID: 29088399 DOI: 10.1093/pcp/pcx164] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 10/24/2017] [Indexed: 05/21/2023]
Abstract
Floral induction in Tulipa gesneriana and Lilium longiflorum is triggered by contrasting temperature conditions, high and low temperature, respectively. In Arabidopsis, the floral integrator FLOWERING LOCUS T (FT), a member of the PEBP (phosphatidyl ethanolamine-binding protein) gene family, is a key player in flowering time control. In this study, one PEBP gene was identified and characterized in lily (LlFT) and three PEBP genes were isolated from tulip (TgFT1, TgFT2 and TgFT3). Overexpression of these genes in Arabidopsis thaliana resulted in an early flowering phenotype for LlFT and TgFT2, but a late flowering phenotype for TgFT1 and TgFT3. Overexpression of LlFT in L. longiflorum also resulted in an early flowering phenotype, confirming its proposed role as a flowering time-controlling gene. The tulip PEBP genes TgFT2 and TgFT3 have a similar expression pattern in tulip, but show opposite effects on the timing of flowering in Arabidopsis. Therefore, the difference between these two proteins was further investigated by interchanging amino acids thought to be important for the FT function. This resulted in the conversion of phenotypes in Arabidopsis upon overexpressing the substituted TgFT2 and TgFT3 genes, revealing the importance of these interchanged amino acid residues. Based on all obtained results, we hypothesize that LlFT is involved in creating meristem competence to flowering-related cues in lily, and TgFT2 is considered to act as a florigen involved in the floral induction in tulip. The function of TgFT3 remains unclear, but, based on our observations and phylogenetic analysis, we propose a bulb-specific function for this gene.
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Affiliation(s)
- Hendrika A C F Leeggangers
- Wageningen Seed Lab (WSL), Laboratory of Plant Physiology, Wageningen University & Research, Wageningen, The Netherlands
| | - Tamar Rosilio-Brami
- Department of Life Sciences, Ben Gurion University of the Negev, Beersheva 84105, Israel
| | - Judit Bigas-Nadal
- Wageningen Seed Lab (WSL), Laboratory of Plant Physiology, Wageningen University & Research, Wageningen, The Netherlands
| | - Noam Rubin
- Department of Life Sciences, Ben Gurion University of the Negev, Beersheva 84105, Israel
| | - Aalt D J van Dijk
- Applied Bioinformatics, Bioscience, Plant Sciences Group, Wageningen University & Research, Wageningen, The Netherlands
| | | | - Shani Saadon-Shitrit
- Department of Life Sciences, Ben Gurion University of the Negev, Beersheva 84105, Israel
| | - Harm Nijveen
- Wageningen Seed Lab (WSL), Laboratory of Plant Physiology, Wageningen University & Research, Wageningen, The Netherlands
- Bioinformatics Group, Wageningen University & Research, Wageningen, The Netherlands
| | - Henk W M Hilhorst
- Wageningen Seed Lab (WSL), Laboratory of Plant Physiology, Wageningen University & Research, Wageningen, The Netherlands
| | - Richard G H Immink
- Wageningen Seed Lab (WSL), Laboratory of Plant Physiology, Wageningen University & Research, Wageningen, The Netherlands
| | - Michele Zaccai
- Department of Life Sciences, Ben Gurion University of the Negev, Beersheva 84105, Israel
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243
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Eom H, Park SJ, Kim MK, Kim H, Kang H, Lee I. TAF15b, involved in the autonomous pathway for flowering, represses transcription of FLOWERING LOCUS C. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2018; 93:79-91. [PMID: 29086456 DOI: 10.1111/tpj.13758] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 09/26/2017] [Accepted: 10/25/2017] [Indexed: 05/03/2023]
Abstract
TATA-binding protein-associated factors (TAFs) are general transcription factors within the transcription factor IID (TFIID) complex, which recognizes the core promoter of genes. In addition to their biochemical function, it is known that several TAFs are involved in the regulation of developmental processes. In this study, we found that TAF15b affects flowering time, especially through the autonomous pathway (AP) in Arabidopsis. The mutant taf15b shows late flowering compared with the wild type plant during both long and short days, and vernalization accelerates the flowering time of taf15b. In addition, taf15b shows strong upregulation of FLOWERING LOCUS C (FLC), a flowering repressor in Arabidopsis, and the flc taf15b double mutant completely offsets the late flowering of taf15b, indicating that TAF15b is a typical AP gene. The taf15b mutant also shows increased transcript levels of COOLAIR, an antisense transcript of FLC. Consistently, chromatin immunoprecipitation (ChIP) analyses showed that the TAF15b protein is enriched around both sense and antisense transcription start sites of the FLC locus. In addition, co-immunoprecipitation showed that TAF15b interacts with RNA polymerase II (Pol II), while ChIP showed increased enrichment of the phosphorylated forms, both serine 2 (Ser2) and Ser5, of the C-terminal domain of Pol II at the FLC locus, which is indicative of transcriptional elongation. Finally, taf15b showed higher enrichment of the active histone marker, H3K4me3, on FLC chromatin. Taken together, our results suggest that TAF15b affects flowering time through transcriptional repression of FLC in Arabidopsis.
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Affiliation(s)
- Hyunjoo Eom
- School of Biological Sciences, Seoul National University, Seoul, 08826, Korea
- Center for RNA Research, Institute for Basic Science, Seoul, 08826, Korea
| | - Su Jung Park
- Department of Plant Biotechnology, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, 61186, Korea
| | - Min Kyung Kim
- Department of Plant Biotechnology, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, 61186, Korea
| | - Hoyeun Kim
- School of Biological Sciences, Seoul National University, Seoul, 08826, Korea
| | - Hunseung Kang
- Department of Plant Biotechnology, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, 61186, Korea
| | - Ilha Lee
- School of Biological Sciences, Seoul National University, Seoul, 08826, Korea
- Plant Genomics and Breeding Institute, Seoul National University, Seoul, 08826, Korea
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244
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Yan Z, Jia J, Yan X, Shi H, Han Y. Arabidopsis KHZ1 and KHZ2, two novel non-tandem CCCH zinc-finger and K-homolog domain proteins, have redundant roles in the regulation of flowering and senescence. PLANT MOLECULAR BIOLOGY 2017; 95:549-565. [PMID: 29076025 DOI: 10.1007/s11103-017-0667-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 10/07/2017] [Indexed: 05/19/2023]
Abstract
The two novel CCCH zinc-finger and K-homolog (KH) proteins, KHZ1 and KHZ2, play important roles in regulating flowering and senescence redundantly in Arabidopsis. The CCCH zinc-finger proteins and K-homolog (KH) proteins play important roles in plant development and stress responses. However, the biological functions of many CCCH zinc-finger proteins and KH proteins remain uncharacterized. In Arabidopsis, KHZ1 and KHZ2 are characterized as two novel CCCH zinc-finger and KH domain proteins which belong to subfamily VII in CCCH family. We obtained khz1, khz2 mutants and khz1 khz2 double mutants, as well as overexpression (OE) lines of KHZ1 and KHZ2. Compared with the wild type (WT), the khz2 mutants displayed no defects in growth and development, and the khz1 mutants were slightly late flowering, whereas the khz1 khz2 double mutants showed a pronounced late flowering phenotype. In contrast, artificially overexpressing KHZ1 and KHZ2 led to the early flowering. Consistent with the late flowering phenotype, the expression of flowering repressor gene FLC was up-regulated, while the expression of flowering integrator and floral meristem identity (FMI) genes were down-regulated significantly in khz1 khz2. In addition, we also observed that the OE plants of KHZ1 and KHZ2 showed early leaf senescence significantly, whereas the khz1 khz2 double mutants showed delayed senescence of leaf and the whole plant. Both KHZ1 and KHZ2 were ubiquitously expressed throughout the tissues of Arabidopsis. KHZ1 and KHZ2 were localized to the nucleus, and possessed both transactivation activities and RNA-binding abilities. Taken together, we conclude that KHZ1 and KHZ2 have redundant roles in the regulation of flowering and senescence in Arabidopsis.
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Affiliation(s)
- Zongyun Yan
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Jianheng Jia
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Xiaoyuan Yan
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Huiying Shi
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Yuzhen Han
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China.
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245
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Jamge S, Stam M, Angenent GC, Immink RGH. A cautionary note on the use of chromosome conformation capture in plants. PLANT METHODS 2017; 13:101. [PMID: 29177001 PMCID: PMC5691870 DOI: 10.1186/s13007-017-0251-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 11/08/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND The chromosome conformation capture (3C) technique is a method to study chromatin interactions at specific genomic loci. Initially established for yeast the 3C technique has been adapted to plants in recent years in order to study chromatin interactions and their role in transcriptional gene regulation. As the plant scientific community continues to implement this technology, a discussion on critical controls, validations steps and interpretation of 3C data is essential to fully benefit from 3C in plants. RESULTS Here we assess the reliability and robustness of the 3C technique for the detection of chromatin interactions in Arabidopsis. As a case study, we applied this methodology to the genomic locus of a floral integrator gene SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1), and demonstrate the need of several controls and standard validation steps to allow a meaningful interpretation of 3C data. The intricacies of this promising but challenging technique are discussed in depth. CONCLUSIONS The 3C technique offers an interesting opportunity to study chromatin interactions at a resolution infeasible by microscopy. However, for interpretation of 3C interaction data and identification of true interactions, 3C technology demands a stringent experimental setup and extreme caution.
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Affiliation(s)
- Suraj Jamge
- Laboratory of Molecular Biology, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Maike Stam
- Swammerdam Institute for Life Sciences, Universiteit van Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Gerco C. Angenent
- Laboratory of Molecular Biology, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
- Wageningen Plant Research, Bioscience, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Richard G. H. Immink
- Laboratory of Molecular Biology, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
- Wageningen Plant Research, Bioscience, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
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246
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Bai S, Tuan PA, Saito T, Ito A, Ubi BE, Ban Y, Moriguchi T. Repression of TERMINAL FLOWER1 primarily mediates floral induction in pear (Pyrus pyrifolia Nakai) concomitant with change in gene expression of plant hormone-related genes and transcription factors. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:4899-4914. [PMID: 28992213 PMCID: PMC5853822 DOI: 10.1093/jxb/erx296] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 08/02/2017] [Indexed: 05/22/2023]
Abstract
Floral induction is an important event in the annual growth cycle of perennial fruit trees. For pear, this event directly affects fruit production in the following year. The flower buds in many species are induced by FLOWERING LOCUS T (FT), whose effect is repressed by the meristem-expressed gene TERMINAL FLOWER1 (TFL1). In this study, we investigated the functions of pear FT and TFL1 genes during floral development. Expression of pear FTs (PpFT1a and PpFT2a) in reproductive meristems was not obviously induced prior to floral initiation, while expression of TFL1s (PpTFL1-1a and PpTFL1-2a) rapidly decreased. The induction of the productive meristem identity MADS-box gene AP1 after repression of PpTFL1s suggested a primary role for PpTFL1 in floral induction. RNA-seq analysis suggested that plant hormone-related genes and several transcription factors that were coexpressed with PpTFL1 were potentially involved in the PpTFL1-mediated floral induction. Our data indicate the essential function of TFL1 in pear floral induction and add another species in the family Rosaceae in addition to strawberry and rose that shows a role for TFL1 in floral induction.
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Affiliation(s)
- Songling Bai
- Institute of Fruit Tree and Tea Science, NARO, Tsukuba, Ibaraki, Japan
- Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, Zhejiang University, Hangzhou, China
| | - Pham Anh Tuan
- Institute of Fruit Tree and Tea Science, NARO, Tsukuba, Ibaraki, Japan
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Takanori Saito
- Institute of Fruit Tree and Tea Science, NARO, Tsukuba, Ibaraki, Japan
- Graduate School of Horticulture, Chiba University, Matsudo-shi, Chiba, Japan
| | - Akiko Ito
- Institute of Fruit Tree and Tea Science, NARO, Tsukuba, Ibaraki, Japan
| | - Benjamin Ewa Ubi
- Institute of Fruit Tree and Tea Science, NARO, Tsukuba, Ibaraki, Japan
- Department of Biotechnology, Ebonyi State University, Abakaliki, Nigeria
| | - Yusuke Ban
- Institute of Fruit Tree and Tea Science, NARO, Tsukuba, Ibaraki, Japan
- Western Region Agricultural Research Center, NARO, Division of Lowland Crop Research, Fukuyama-shi, Hiroshima, Japan
| | - Takaya Moriguchi
- Institute of Fruit Tree and Tea Science, NARO, Tsukuba, Ibaraki, Japan
- Institute of Fruit Tree and Tea Science, NARO, Division of Citrus Research, Okitsu-Nakacho Shimizu, Shizuoka, Japan
- Correspondence:
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247
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Control of chrysanthemum flowering through integration with an aging pathway. Nat Commun 2017; 8:829. [PMID: 29018260 PMCID: PMC5635119 DOI: 10.1038/s41467-017-00812-0] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 07/24/2017] [Indexed: 12/04/2022] Open
Abstract
Age, as a threshold of floral competence acquisition, prevents precocious flowering when there is insufficient biomass, and ensures flowering independent of environmental conditions; however, the underlying regulatory mechanisms are largely unknown. In this study, silencing the expression of a nuclear factor gene, CmNF-YB8, from the short day plant chrysanthemum (Chrysanthemum morifolium), results in precocious transition from juvenile to adult, as well as early flowering, regardless of day length conditions. The expression of SQUAMOSA PROMOTER BINDING-LIKE (SPL) family members, SPL3, SPL5, and SPL9, is upregulated in CmNF-YB8-RNAi plants, while expression of the microRNA, cmo-MIR156, is downregulated. In addition, CmNF-YB8 is shown to bind to the promoter of the cmo-MIR156 gene. Ectopic expression of cmo-miR156, using a virus-based microRNA expression system, restores the early flowering phenotype caused by CmNF-YB8 silencing. These results show that CmNF-YB8 influences flowering time through directly regulating the expression of cmo-MIR156 in the aging pathway. The mechanisms by which plant age regulates flowering remain incompletely understood. Here the authors show that age dependent regulation of SPL transcription factors by miR156 influence flowering via control of NF-YB8 expression in Chrysanthemum.
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248
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He R, Li X, Zhong M, Yan J, Ji R, Li X, Wang Q, Wu D, Sun M, Tang D, Lin J, Li H, Liu B, Liu H, Liu X, Zhao X, Lin C. A photo-responsive F-box protein FOF2 regulates floral initiation by promoting FLC expression in Arabidopsis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2017; 91:788-801. [PMID: 28608936 DOI: 10.1111/tpj.13607] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 04/08/2017] [Accepted: 05/13/2017] [Indexed: 05/09/2023]
Abstract
Floral initiation is regulated by various genetic pathways in response to light, temperature, hormones and developmental status; however, the molecular mechanisms underlying the interactions between different genetic pathways are not fully understood. Here, we show that the photoresponsive gene FOF2 (F-box of flowering 2) negatively regulates flowering. FOF2 encodes a putative F-box protein that interacts specifically with ASK14, and its overexpression results in later flowering under both long-day and short-day photoperiods. Conversely, transgenic plants expressing the F-box domain deletion mutant of FOF2 (FOF2ΔF), or double loss of function mutant of FOF2 and FOL1 (FOF2-LIKE 1) present early flowering phenotypes. The late flowering phenotype of the FOF2 overexpression lines is suppressed by the flc-3 loss-of-function mutation. Furthermore, FOF2 mRNA expression is regulated by autonomous pathway gene FCA, and the repressive effect of FOF2 in flowering can be overcome by vernalization. Interestingly, FOF2 expression is regulated by light. The protein level of FOF2 accumulates in response to light, whereas it is degraded under dark conditions via the 26S proteasome pathway. Our findings suggest a possible mechanistic link between light conditions and the autonomous floral promotion pathway in Arabidopsis.
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Affiliation(s)
- Reqing He
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Xinmei Li
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Ming Zhong
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Jindong Yan
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Ronghuan Ji
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Xu Li
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Qin Wang
- Department of Molecular, Cell & Developmental Biology, University of California, Los Angeles, CA, 90095, USA
| | - Dan Wu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Mengsi Sun
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Dongying Tang
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Jianzhong Lin
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Hongyu Li
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Bin Liu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Hongtao Liu
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Xuanming Liu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Xiaoying Zhao
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha, 410082, China
| | - Chentao Lin
- Department of Molecular, Cell & Developmental Biology, University of California, Los Angeles, CA, 90095, USA
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249
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Zhu C, Wang L, Chen J, Liu C, Zeng H, Wang H. Over-expression of KdSOC1 gene affected plantlet morphogenesis in Kalanchoe daigremontiana. Sci Rep 2017; 7:5629. [PMID: 28717174 PMCID: PMC5514138 DOI: 10.1038/s41598-017-04387-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 05/15/2017] [Indexed: 11/19/2022] Open
Abstract
Kalanchoe daigremontiana reproduces asexually by producing plantlets along the leaf margin. The aim of this study was to identify the function of the SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 gene in Kalanchoe daigremontiana (KdSOC1) during plantlet morphogenesis. In this study, KdSOC1 gene expression was detected at stem cell niche during in vitro somatic embryogenesis and plantlet morphogenesis. Disrupting endogenous auxin transportation suppressed the KdSOC1 gene response. Knockdown of the KdSOC1 gene caused a defect in cotyledon formation during the early heart stage of somatic embryogenesis. Over-expression (OE) of the KdSOC1 gene resulted in asymmetric plantlet distribution, a reduced number of plantlets, thicker leaves, and thicker vascular fibers. Higher KdPIN1 gene expression and auxin content were found in OE plant compared to those of wild-type plant leaves, which indicated possible KdSOC1 gene role in affecting auxin distribution and accumulation. KdSOC1 gene OE in DR5-GUS Arabidopsis reporting lines resulted in an abnormal auxin response pattern during different stages of somatic embryogenesis. In summary, the KdSOC1 gene OE might alter auxin distribution and accumulation along leaf margin to initiate plantlet formation and distribution, which is crucial for plasticity during plantlet formation under various environmental conditions.
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Affiliation(s)
- Chen Zhu
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
| | - Li Wang
- Sivilculture Forestry department, College of Forestry, Beijing Forestry University, Beijing, China
| | - Jinhua Chen
- Turfgrass Management department, College of Forestry, Beijing forestry university, Beijing, China
| | - Chenglan Liu
- Turfgrass Management department, College of Forestry, Beijing forestry university, Beijing, China
| | - Huiming Zeng
- Turfgrass Management department, College of Forestry, Beijing forestry university, Beijing, China.
| | - Huafang Wang
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.
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250
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Farhi J, Tian G, Fang H, Maxwell D, Xing T, Tian L. Histone deacetylase HD2D is involved in regulating plant development and flowering time in Arabidopsis. PLANT SIGNALING & BEHAVIOR 2017; 12:e1300742. [PMID: 28737472 PMCID: PMC5586354 DOI: 10.1080/15592324.2017.1300742] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
HD2D is one of the 4 plant specific HD2 family histone deacetylases (HDAC) identified in Arabidopsis and it is distantly related to the other HD2 members. At this time, little is known about the function of HD2D in plants. Here we provide evidence that HD2D is involved in the control of flowering time. Flowering was delayed in transgenic plants overexpressing HD2D and hd2d mutant plants flowered earlier compared with wild-type in both long day and short day conditions. Expression of several floral identity genes was altered in these plants. Taken together, our findings suggest that HD2D is a negative regulator of flowering that modulates the transition of vegetative to reproductive growth in a photoperiod independent manner.
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Affiliation(s)
- Joshua Farhi
- Department of Biology, University of Western Ontario, London, ON, Canada
| | - Gang Tian
- London Research and Development Centre, Agriculture and Agri-Food Canada, London, ON, Canada
| | - Hui Fang
- London Research and Development Centre, Agriculture and Agri-Food Canada, London, ON, Canada
| | - Denis Maxwell
- Department of Biology, University of Western Ontario, London, ON, Canada
| | - Tim Xing
- Department of Biology, Carleton University, Ottawa, ON, Canada
| | - Lining Tian
- Department of Biology, University of Western Ontario, London, ON, Canada
- London Research and Development Centre, Agriculture and Agri-Food Canada, London, ON, Canada
- CONTACT Lining Tian London Research and Development Center, Agriculture and Agri-Food Canada, 1391 Sanford Street, London, Ontario, Canada, N5V 4T3
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