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Zebosi B, Vollbrecht E, Best NB. Brassinosteroid biosynthesis and signaling: Conserved and diversified functions of core genes across multiple plant species. PLANT COMMUNICATIONS 2024; 5:100982. [PMID: 38816993 DOI: 10.1016/j.xplc.2024.100982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 05/13/2024] [Accepted: 05/28/2024] [Indexed: 06/01/2024]
Abstract
Brassinosteroids (BRs) are important regulators that control myriad aspects of plant growth and development, including biotic and abiotic stress responses, such that modulating BR homeostasis and signaling presents abundant opportunities for plant breeding and crop improvement. Enzymes and other proteins involved in the biosynthesis and signaling of BRs are well understood from molecular genetics and phenotypic analysis in Arabidopsis thaliana; however, knowledge of the molecular functions of these genes in other plant species, especially cereal crop plants, is minimal. In this manuscript, we comprehensively review functional studies of BR genes in Arabidopsis, maize, rice, Setaria, Brachypodium, and soybean to identify conserved and diversified functions across plant species and to highlight cases for which additional research is in order. We performed phylogenetic analysis of gene families involved in the biosynthesis and signaling of BRs and re-analyzed publicly available transcriptomic data. Gene trees coupled with expression data provide a valuable guide to supplement future research on BRs in these important crop species, enabling researchers to identify gene-editing targets for BR-related functional studies.
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Affiliation(s)
- Brian Zebosi
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA 50011, USA; Interdepartmental Genetics and Genomics Graduate Program, Iowa State University, Ames, IA 50011, USA
| | - Erik Vollbrecht
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA 50011, USA; Interdepartmental Genetics and Genomics Graduate Program, Iowa State University, Ames, IA 50011, USA.
| | - Norman B Best
- USDA-ARS, Plant Genetics Research Unit, Columbia, MO 65201, USA.
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2
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Ma Y, Ma C, Zhou P, Gao F, Tan W, Huang X, Bai Y, Li M, Wang Z, Hayat F, Shi T, Ni Z, Gao Z. PmLBD3 links auxin and brassinosteroid signalling pathways on dwarfism in Prunus mume. BMC Biol 2024; 22:184. [PMID: 39183294 PMCID: PMC11346286 DOI: 10.1186/s12915-024-01985-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Accepted: 08/15/2024] [Indexed: 08/27/2024] Open
Abstract
BACKGROUND Grafting with dwarf rootstock is an efficient method to control plant height in fruit production. However, the molecular mechanism remains unclear. Our previous study showed that plants with Prunus mume (mume) rootstock exhibited a considerable reduction in plant height, internode length, and number of nodes compared with Prunus persica (peach) rootstock. The present study aimed to investigate the mechanism behind the regulation of plant height by mume rootstocks through transcriptomic and metabolomic analyses with two grafting combinations, 'Longyan/Mume' and 'Longyan/Peach'. RESULTS There was a significant decrease in brassinolide levels in plants that were grafted onto mume rootstocks. Plant hormone signal transduction and brassinolide production metabolism gene expression also changed significantly. Flavonoid levels, amino acid and fatty acid metabolites, and energy metabolism in dwarf plants decreased. There was a notable upregulation of PmLBD3 gene expression in plant specimens that were subjected to grafting onto mume rootstocks. Auxin signalling cues promoted PmARF3 transcription, which directly controlled this upregulation. Through its binding to PmBAS1 and PmSAUR36a gene promoters, PmLBD3 promoted endogenous brassinolide inactivation and inhibited cell proliferation. CONCLUSIONS Auxin signalling and brassinolide levels are linked by PmLBD3. Our findings showed that PmLBD3 is a key transcription factor that regulates the balance of hormones through the auxin and brassinolide signalling pathways and causes dwarf plants in stone fruits.
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Affiliation(s)
- Yufan Ma
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Chengdong Ma
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Pengyu Zhou
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Feng Gao
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Wei Tan
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Xiao Huang
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Yang Bai
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Minglu Li
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Ziqi Wang
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Faisal Hayat
- College of Horticulture, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong, China
| | - Ting Shi
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Zhaojun Ni
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Zhihong Gao
- Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu, China.
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Zhang W, Huang H, Zhou Y, Zhu K, Wu Y, Xu Y, Wang W, Zhang H, Gu J, Xiong F, Wang Z, Liu L, Yang J. Brassinosteroids mediate moderate soil-drying to alleviate spikelet degeneration under high temperature during meiosis of rice. PLANT, CELL & ENVIRONMENT 2023; 46:1340-1362. [PMID: 36097648 DOI: 10.1111/pce.14436] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 08/31/2022] [Accepted: 09/08/2022] [Indexed: 06/15/2023]
Abstract
This study tested the hypothesis that brassinosteroids (BRs) mediate moderate soil-drying (MD) to alleviate spikelet degeneration under high temperature (HT) stress during meiosis of rice (Oryza sativa L.). A rice cultivar was pot-grown and subjected to normal temperature (NT) and HT treatments during meiosis, and two irrigation regimes including well-watered (WW) and MD were imposed to the plants simultaneously. The MD effectively alleviated the spikelet degeneration and yield loss under HT stress mainly via improving root activity and canopy and panicle traits including higher photosynthetic capacity, tricarboxylic acid cycle activity, and antioxidant capacity than WW. These parameters were regulated by BRs levels in plants. The decrease in BRs levels at HT was due mainly to the enhanced BRs decomposition, and the MD could rescue the BRs deficiency at HT via enhancing BRs biosynthesis and impeding decomposition. The connection between BRs and HT was verified by using rice BRs-deficient mutants, transgenic rice lines, and chemical regulators. Similar results were obtained in the open-air field experiment. The results suggest that BRs can mediate the MD to alleviate spikelet degeneration under HT stress during meiosis mainly via enhancing root activity, canopy traits, and young panicle traits of rice.
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Affiliation(s)
- Weiyang Zhang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China
| | - Hanghang Huang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China
| | - Yujiao Zhou
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China
| | - Kuanyu Zhu
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China
| | - Yunfei Wu
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, Jiangsu, China
| | - Yunji Xu
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou University, Yangzhou, Jiangsu, China
| | - Weilu Wang
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou University, Yangzhou, Jiangsu, China
| | - Hao Zhang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China
| | - Junfei Gu
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China
| | - Fei Xiong
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, Jiangsu, China
| | - Zhiqin Wang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China
| | - Lijun Liu
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China
| | - Jianchang Yang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou University, Yangzhou, Jiangsu, China
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Ishii H, Ishikawa A, Yumoto E, Kurokura T, Asahina M, Shimada Y, Nakamura A. Propiconazole-induced brassinosteroid deficiency reduces female fertility by inhibiting female gametophyte development in woodland strawberry. PLANT CELL REPORTS 2023; 42:587-598. [PMID: 36629883 DOI: 10.1007/s00299-023-02981-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
In woodland strawberry, a brassinosteroid biosynthesis inhibitor propiconazole induced typical brassinosteroid-deficient phenotypes and decreased female fertility due to attenuated female gametophyte development. Brassinosteroids (BRs) play roles in various aspects of plant development. We investigated the physiological roles of BRs in the woodland strawberry, Fragaria vesca. BR-level-dependent phenotypes were observed using a BR biosynthetic inhibitor, propiconazole (PCZ), and the most active natural BR, brassinolide (BL). Endogenous BL and castasterone, the active BRs, were below detectable levels in PCZ-treated woodland strawberry. The plants were typical BR-deficient phenotypes, and all phenotypes were restored by treatment with BL. These observations indicate that PCZ is an effective inhibitor of BR in woodland strawberry. Only one gene for each major step of BR biosynthesis in Arabidopsis is encoded in the woodland strawberry genome. BR biosynthetic genes are highly expressed during the early stage of fruit development. Emasculated flowers treated with BL failed to develop fruit, implying that BR is not involved in parthenocarpic fruit development. Similar to BR-deficient and BR-insensitive Arabidopsis mutants, female fertility was lower in PCZ-treated plants than in mock-treated plants due to failed attraction of the pollen tube to the ovule. In PCZ-treated plants, expression of FveMYB98, the homologous gene for Arabidopsis MYB98 (a marker for synergid cells), was downregulated. Ovules were smaller in PCZ-treated plants than in mock-treated plants, and histological analysis implied that the development of more than half of female gametophytes was arrested at the early stage in PCZ-treated plants. Our findings explain how BRs function during female gametophyte development in woodland strawberry.
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Affiliation(s)
- Hikari Ishii
- Yokohama City University, Kihara Institute for Biological Research, Maioka 641-12, Totsuka, Yokohama, Kanagawa, 244-0813, Japan
| | - Ami Ishikawa
- Yokohama City University, Kihara Institute for Biological Research, Maioka 641-12, Totsuka, Yokohama, Kanagawa, 244-0813, Japan
| | - Emi Yumoto
- Advanced Instrumental Analysis Center, Teikyo University, 1-1 Toyosatodai, Utsunomiya, Tochigi, 321-8505, Japan
| | - Takeshi Kurokura
- Faculty of Agriculture, Utsunomiya University, 350 Mine, Utsunomiya, Tochigi, 321-8505, Japan
| | - Masashi Asahina
- Advanced Instrumental Analysis Center, Teikyo University, 1-1 Toyosatodai, Utsunomiya, Tochigi, 321-8505, Japan
- Department of Biosciences, Teikyo University, 1-1 Toyosatodai, Utsunomiya, Tochigi, 320-8551, Japan
| | - Yukihisa Shimada
- Yokohama City University, Kihara Institute for Biological Research, Maioka 641-12, Totsuka, Yokohama, Kanagawa, 244-0813, Japan
| | - Ayako Nakamura
- Yokohama City University, Kihara Institute for Biological Research, Maioka 641-12, Totsuka, Yokohama, Kanagawa, 244-0813, Japan.
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Zhang H, Yang D, Wang P, Zhang X, Ding Z, Zhao L. Feedback Inhibition Might Dominate the Accumulation Pattern of BR in the New Shoots of Tea Plants ( Camellia sinensis). Front Genet 2022; 12:809608. [PMID: 35273632 PMCID: PMC8902050 DOI: 10.3389/fgene.2021.809608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 12/28/2021] [Indexed: 11/15/2022] Open
Abstract
Brassinosteroid (BR), a kind of polyhydroxylated steroid hormone, plays an important role in physiological and biochemical processes in plants. Studies were mainly focused on BR signaling and its exogenous spraying to help enhance crop yields. Few research studies are centered on the accumulation pattern of BR and its mechanism. Yet, it is crucial to unlock the mystery of the function of BR and its cross action with other hormones. Tea (Camellia sinensis (L.) O. Kuntze) is one of the important economic crops in some countries, and new shoots are the raw materials for the preparation of various tea products. Different concentrations of exogenous BR were reported to have different effects on growth and development. New shoots of tea plants can thus be considered a valuable research object to study the accumulation pattern of BR. In this study, the quantity of five BR components (brassinolide, 28-norbrassinolide, 28-homobrassinolide, castasterone, and 28-norcastasterone) in different tissues of tea plants, including buds (Bud), different maturity of leaves (L1, L2), and stems (S1, S2) were determined by UPLC-MS/MS. A total of 15 cDNA libraries of the same tissue with three repetitions for each were constructed and sequenced. The BR-accumulation pattern and gene expression pattern were combined together for weighted gene co-expression network analysis (WGCNA). BR-accumulation-relative genes were then screened using two methods, based on the K.in value and BR biosynthetic pathway (ko00905), respectively. The result showed that photosynthesis-related genes and CYP450 family genes were actively involved and might play important roles in BR accumulation and/or its accumulation pattern. First and foremost, feedback inhibition was more likely to dominate the accumulation pattern of BR in the new shoots of tea plants. Moreover, three conserved miRNAs with their target transcriptional factors and target mRNAs had been figured out from negative correlation modules that might be strongly linked to the BR-accumulation pattern. Our study provided an experimental basis for the role of BR in tea plants. The excavation of genes related to the accumulation pattern of BR provided the possibility of cross-action studies on the regulation of BR biosynthesis and the study between BR and other hormones.
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Affiliation(s)
- Hanghang Zhang
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Dong Yang
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Peiqiang Wang
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Xinfu Zhang
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Zhaotang Ding
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
| | - Lei Zhao
- College of Horticulture, Qingdao Agricultural University, Qingdao, China
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6
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Liu L, Xie Z, Lu L, Qanmber G, Chen G, Li S, Guo M, Sun Z, Liu Z, Yang Z. Identification of BR biosynthesis genes in cotton reveals that GhCPD-3 restores BR biosynthesis and mediates plant growth and development. PLANTA 2021; 254:75. [PMID: 34533620 DOI: 10.1007/s00425-021-03727-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 09/08/2021] [Indexed: 06/13/2023]
Abstract
Brassinosteroid (BR) synthesis genes in different cotton species was comprehensively identified, and the participation of GhCPD-3 in the BR synthesis signaling pathway for regulating plant development was verified. Brassinosteroid is a natural steroidal phytohormone that plays fundamental roles in plant growth and development. In cotton, detailed characterization and functional validation of BR biosynthesis genes remain rare. Here, 16, 8 and 9 BR biosynthesis genes were identified in Gossypium hirsutum, Gossypium raimondii and Gossypium arboreum, respectively, and their phylogenetic relationships, gene structures, conserved motifs of the encoded proteins, chromosomal locations were determined and a synteny analysis was performed. Gossypium hirsutum and Arabidopsis BR biosynthesis genes closely clustered in the phylogenetic tree and fragment duplication was likely the primary cause promoting gene family expansion in G. hirsutum. Gene Ontology (GO) and KEGG (Kyoto Encyclopedia of Genes and Genomes) enrichment analysis showed their relevance as BR biosynthesis genes. GhCPD-3 was highly expressed in roots and stems and the loci of single nucleotide polymorphisms (SNPs) were significantly associated with these traits.Ectopic overexpression of GhCPD-3 in the cpd91 Arabidopsis mutant rescued the mutant phenotype by increasing plant height and leaf size in comparison to those of cpd91 and WT plants. Moreover, overexpressed GhCPD-3 in cpd91 mutants showed greater hypocotyl and root lengths than those of cpd91 and WT plants under light and dark conditions, respectively, indicating that BR actively promotes hypocotyl and root growth. Similar to CPD (CONSTITUTIVE PHOTOMORPHOGENIC DWARF), GhCPD-3 restores BR biosynthesis thereby mediating plant growth and development.
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Affiliation(s)
- Le Liu
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Zongming Xie
- Xinjiang Production and Construction Group Key Laboratory of Crop Germplasm Enhancement and Gene Resources Utilization, Biotechnology Research Institute of Xinjiang Academy of Agricultural and Reclamation Science, Shihezi, 832000, Xinjiang, China
| | - Lili Lu
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Ghulam Qanmber
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Guoquan Chen
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Shengdong Li
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Mengzhen Guo
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Zhuojing Sun
- Development Center for Science and Technology, Ministry of Agriculture and Rural Affairs, Beijing, 100122, China
| | - Zhao Liu
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China.
| | - Zuoren Yang
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China.
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China.
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Xie D, Tarin MWK, Chen L, Ren K, Yang D, Zhou C, Wan J, He T, Rong J, Zheng Y. Consequences of LED Lights on Root Morphological Traits and Compounds Accumulation in Sarcandra glabra Seedlings. Int J Mol Sci 2021; 22:7179. [PMID: 34281238 PMCID: PMC8268991 DOI: 10.3390/ijms22137179] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/21/2021] [Accepted: 06/28/2021] [Indexed: 01/26/2023] Open
Abstract
This study evaluated the effects of different light spectra (white light; WL, blue light; BL and red light; RL) on the root morphological traits and metabolites accumulation and biosynthesis in Sarcandra glabra. We performed transcriptomic and metabolomic profiling by RNA-seq and ultra-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (UPLC-ESI-MS/MS), respectively. When morphological features were compared to WL, BL substantially increased under-ground fresh weight, root length, root surface area, and root volume, while RL inhibited these indices. A total of 433 metabolites were identified, of which 40, 18, and 68 compounds differentially accumulated in roots under WL (WG) vs. roots under BL (BG), WG vs. roots under RL (RG), and RG vs. BG, respectively. In addition, the contents of sinapyl alcohol, sinapic acid, fraxetin, and 6-methylcoumarin decreased significantly in BG and RG. In contrast, chlorogenic acid, rosmarinyl glucoside, quercitrin and quercetin were increased considerably in BG. Furthermore, the contents of eight terpenoids compounds significantly reduced in BG. Following transcriptomic profiling, several key genes related to biosynthesis of phenylpropanoid-derived and terpenoids metabolites were differentially expressed, such as caffeic acid 3-O-methyltransferase) (COMT), hydroxycinnamoyl-CoA shikimate hydroxycinnamoyl transferase (HCT), O-methyltransferase (OMT), and 1-deoxy-D-xylulose-5-phosphate synthetase (DXS). In summary, our findings showed that BL was suitable for growth and accumulation of bioactive metabolites in root tissue of S. glabra. Exposure to a higher ratio of BL might have the potential to improve the production and quality of S. glabra seedlings, but this needs to be confirmed further.
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Affiliation(s)
- Dejin Xie
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (D.X.); (K.R.); (D.Y.); (J.W.); (J.R.)
| | - Muhammad Waqqas Khan Tarin
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (M.W.K.T.); (L.C.); (C.Z.); (T.H.)
| | - Lingyan Chen
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (M.W.K.T.); (L.C.); (C.Z.); (T.H.)
| | - Ke Ren
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (D.X.); (K.R.); (D.Y.); (J.W.); (J.R.)
| | - Deming Yang
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (D.X.); (K.R.); (D.Y.); (J.W.); (J.R.)
| | - Chengcheng Zhou
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (M.W.K.T.); (L.C.); (C.Z.); (T.H.)
| | - Jiayi Wan
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (D.X.); (K.R.); (D.Y.); (J.W.); (J.R.)
| | - Tianyou He
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (M.W.K.T.); (L.C.); (C.Z.); (T.H.)
| | - Jundong Rong
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (D.X.); (K.R.); (D.Y.); (J.W.); (J.R.)
| | - Yushan Zheng
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (D.X.); (K.R.); (D.Y.); (J.W.); (J.R.)
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (M.W.K.T.); (L.C.); (C.Z.); (T.H.)
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8
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Jin Y, Yu C, Jiang C, Guo X, Li B, Wang C, Kong F, Zhang H, Wang H. PtiCYP85A3, a BR C-6 Oxidase Gene, Plays a Critical Role in Brassinosteroid-Mediated Tension Wood Formation in Poplar. FRONTIERS IN PLANT SCIENCE 2020; 11:468. [PMID: 32391036 PMCID: PMC7193022 DOI: 10.3389/fpls.2020.00468] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 03/30/2020] [Indexed: 05/21/2023]
Abstract
In angiosperm trees, the gelatinous layer (G-layer) takes a great part of the fiber cell wall in the tension wood (TW). However, the mechanism underlying G-layer formation in poplar is largely unknown. In this work, we demonstrate that G-layer formation in poplar TW cells is regulated by brassinosteroid (BR) and its signaling. PtiCYP85A3, a key BR biosynthesis gene, was predominantly expressed in the xylem of TW, accompanied with a relatively higher castasterone (CS) accumulation, than in the xylem of opposite wood (OW). A wider expression zone of BZR1, a key transcriptional factor in BR singling pathway, was also observed in G-fiber cells on TW side than in wood fiber cells on the OW side, as indicated by immunohistochemistry assays. Transgenic poplar plants overexpressing PtiCYP85A3 produced thicker G-layer with higher cellulose proportion, and accumulated more BZR1 protein in the xylem of TW than did the wild type (WT) plants. Expression of most TW-associated CesAs, which were induced by 2, 4-epibrassinolide, an active BR, and inhibited by brassinazole, a BR biosynthesis inhibitor, were also up-regulated in the xylem of TW in transgenic plants compared to that in WT plants. Further studies with dual-luciferase assays demonstrated that the promoters of PtiCesAs were activated by PtiMYB128, a TW specific transcription factor, which was then regulated by BZR1. All these results indicate that BR plays a crucial role in the G-layer formation of TW fiber cells by regulating the expression of BZR1, PtiMYB128, and PtiCesAs in poplar.
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Affiliation(s)
- Yanli Jin
- College of Agriculture, Ludong University, Yantai, China
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in the Universities of Shandong, Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
| | - Chunyan Yu
- College of Agriculture, Ludong University, Yantai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in the Universities of Shandong, Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
| | - Chunmei Jiang
- College of Agriculture, Ludong University, Yantai, China
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, College of Life Sciences, Hubei University, Wuhan, China
| | - Xiaotong Guo
- College of Agriculture, Ludong University, Yantai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in the Universities of Shandong, Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
| | - Bei Li
- College of Agriculture, Ludong University, Yantai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in the Universities of Shandong, Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
| | - Cuiting Wang
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Fanjing Kong
- Ministry of Natural Resources Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, China
| | - Hongxia Zhang
- College of Agriculture, Ludong University, Yantai, China
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in the Universities of Shandong, Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
| | - Haihai Wang
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
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9
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Roh J, Moon J, Youn JH, Seo C, Park YJ, Kim SK. Establishment of Biosynthetic Pathways To Generate Castasterone as the Biologically Active Brassinosteroid in Brachypodium distachyon. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:3912-3923. [PMID: 32146811 DOI: 10.1021/acs.jafc.9b07963] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Gas chromatography-mass spectrometry (GC-MS) analysis revealed that castasterone and its biosynthetic precursors are found in Brachypodium distachyon. In vitro conversion experiments with crude enzyme solutions prepared from B. distachyon demonstrated the presence of the following biosynthetic sequences: campesterol → campesta-4-en-3-one → campesta-3-one → campestanol → 6-deoxocathasterone → 6-deoxoteasterone → teasterone ↔ 3-dehydroteasterone ↔ typhasterol → castasterone. campesterol → 22-hydroxycampesterol → 22-hydroxy-campesta-4-en-3-one → 22-hydroxy-campesta-3-one → 6-deoxo-3-dehydroteasterone → 3-dehydroteasterone. 6-deoxoteasterone ↔ 6-deoxo-3-dehydroteasterone ↔ 6-deoxotyphasterol → 6-deoxocastasterone → castasterone. This shows that there are campestanol-dependent and campestanol-independent pathway in B. distachyon that synthesize 24-methylated brassinosteroids (BRs). Biochemical analysis of BRs biosynthetic enzymes confirmed that BdDET2, BdCYP90B1, BdCYP90A1, BdCYP90D2, and BdCYP85A1 are orthologous to BR 5α-reductase, BR C-22 hydroxylase, BR C-3 oxidase, BR C-23 hydroxylase, and BR C-6 oxidase, respectively. Brassinolide was not identified in B. distachyon. Additionally, B. distachyon crude enzyme solutions could not catalyze the conversion of castasterone to brassinolide, and the gene encoding an ortholog of CYP85A2 (a brassinolide synthase) was not found in B. distachyon. These results strongly suggest that the end product for brassinosteroid biosynthesis which controls the growth and development of B. distachyon is not brassinolide but rather castasterone.
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Affiliation(s)
- Jeehee Roh
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Jinyoung Moon
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Ji-Hyun Youn
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Chaiweon Seo
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Yeon Ju Park
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Seong-Ki Kim
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
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10
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Wei Z, Li J. Regulation of Brassinosteroid Homeostasis in Higher Plants. FRONTIERS IN PLANT SCIENCE 2020; 11:583622. [PMID: 33133120 PMCID: PMC7550685 DOI: 10.3389/fpls.2020.583622] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 09/09/2020] [Indexed: 05/03/2023]
Abstract
Brassinosteroids (BRs) are known as one of the major classes of phytohormones essential for various processes during normal plant growth, development, and adaptations to biotic and abiotic stresses. Significant progress has been achieved on revealing mechanisms regulating BR biosynthesis, catabolism, and signaling in many crops and in model plant Arabidopsis. It is known that BRs control plant growth and development in a dosage-dependent manner. Maintenance of BR homeostasis is therefore critical for optimal functions of BRs. In this review, updated discoveries on mechanisms controlling BR homeostasis in higher plants in response to internal and external cues are discussed.
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11
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Zheng L, Zhao C, Mao J, Song C, Ma J, Zhang D, Han M, An N. Genome-wide identification and expression analysis of brassinosteroid biosynthesis and metabolism genes regulating apple tree shoot and lateral root growth. JOURNAL OF PLANT PHYSIOLOGY 2018; 231:68-85. [PMID: 30223145 DOI: 10.1016/j.jplph.2018.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 09/04/2018] [Accepted: 09/05/2018] [Indexed: 05/21/2023]
Abstract
In plants, brassinosteroid biosynthesis and metabolism genes affect endogenous brassinosteroid metabolic processes as well as stem and root growth. However, there is little information available regarding these genes in apple. In this study, 22 brassinosteroid biosynthesis and metabolism genes were identified in apple (Malus domestica). These genes were named according to their chromosomal locations and the Arabidopsis thaliana homologs. Their conserved characteristic domains, evolutionary relationships, syntenic relationships, chemical characteristics, gene/protein structures, interactions among the encoded proteins, promoter sequences, and functions were investigated. These 22 genes were clustered with their A. thaliana homologs based on bioinformatics analyses, which suggested they are functionally similar in apple and A. thaliana. Tissue-specific expression levels revealed that most of these genes are important for stem growth and development, while several of these genes affect lateral root formation. The transcription patterns of these genes in shoot tips were investigated following diverse treatments [brassinosteroid (shoot tips and roots), brassinazole, auxin, and temperature]. Gene expression levels were also examined in different grafting combinations ('Nagafu No. 2'/Malling 9 and 'Nagafu No. 2'/'Nagafu No. 2') and shoot varieties ('Yanfu No. 6' and 'Nagafu No. 2'). The results indicated that these genes may be involved in apple stem and root growth. The comprehensive genome-wide analysis of brassinosteroid biosynthesis and metabolism genes presented herein may be useful for breeding new apple cultivars with increased vigor. The data also represent a rich genetic resource for future apple gene functional investigations that may have implications for the genetic improvement of apple tree species.
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Affiliation(s)
- Liwei Zheng
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Caide Zhao
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jiangping Mao
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Chunhui Song
- College of Horticulture, Henan Agricultural University, Zhengzhou, Henan 450002, China
| | - Juanjuan Ma
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Dong Zhang
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Mingyu Han
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Na An
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China; College of Life Science, Northwest A&F University, Yangling 712100, Shaanxi, China.
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12
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Jin Y, Tang R, Wang H, Jiang C, Bao Y, Yang Y, Liang M, Sun Z, Kong F, Li B, Zhang H. Overexpression of Populus trichocarpa CYP85A3 promotes growth and biomass production in transgenic trees. PLANT BIOTECHNOLOGY JOURNAL 2017; 15:1309-1321. [PMID: 28258966 PMCID: PMC5595715 DOI: 10.1111/pbi.12717] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 01/11/2017] [Accepted: 02/20/2017] [Indexed: 05/19/2023]
Abstract
Brassinosteroids (BRs) are essential hormones that play crucial roles in plant growth, reproduction and response to abiotic and biotic stress. In Arabidopsis, AtCYP85A2 works as a bifunctional cytochrome P450 monooxygenase to catalyse the conversion of castasterone to brassinolide, a final rate-limiting step in the BR-biosynthetic pathway. Here, we report the functional characterizations of PtCYP85A3, one of the three AtCYP85A2 homologous genes from Populus trichocarpa. PtCYP85A3 shares the highest similarity with AtCYP85A2 and can rescue the retarded-growth phenotype of the Arabidopsis cyp85a2-2 and tomato dx mutants. Constitutive expression of PtCYP85A3, driven by the cauliflower mosaic virus 35S promoter, increased the endogenous BR levels and significantly promoted the growth and biomass production in both transgenic tomato and poplar. Compared to the wild type, plant height, shoot fresh weight and fruit yield increased 50%, 56% and 43%, respectively, in transgenic tomato plants. Similarly, plant height and stem diameter increased 15% and 25%, respectively, in transgenic poplar plants. Further study revealed that overexpression of PtCYP85A3 enhanced xylem formation without affecting the composition of cellulose and lignin, as well as the cell wall thickness in transgenic poplar. Our finding suggests that PtCYP85A3 could be used as a potential candidate gene for engineering fast-growing trees with improved wood production.
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Affiliation(s)
- Yan‐Li Jin
- College of AgricultureLudong UniversityYantaiChina
- National Key Laboratory of Plant Molecular GeneticsShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina
- University of Chinese Academy of sciencesBeijingChina
| | - Ren‐Jie Tang
- National Key Laboratory of Plant Molecular GeneticsShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina
| | - Hai‐Hai Wang
- College of AgricultureLudong UniversityYantaiChina
- National Key Laboratory of Plant Molecular GeneticsShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina
| | - Chun‐Mei Jiang
- National Key Laboratory of Plant Molecular GeneticsShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina
| | - Yan Bao
- National Key Laboratory of Plant Molecular GeneticsShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina
| | - Yang Yang
- National Key Laboratory of Plant Molecular GeneticsShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina
| | | | - Zhen‐Cang Sun
- National Key Laboratory of Plant Molecular GeneticsShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina
| | - Fan‐Jing Kong
- MLR Key Laboratory of Saline Lake Resources and EnvironmentsInstitute of Mineral ResourcesCAGSBeijingChina
| | - Bei Li
- College of AgricultureLudong UniversityYantaiChina
| | - Hong‐Xia Zhang
- College of AgricultureLudong UniversityYantaiChina
- National Key Laboratory of Plant Molecular GeneticsShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina
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13
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Abstract
Oxidative cyclizations are important transformations that occur widely during natural product biosynthesis. The transformations from acyclic precursors to cyclized products can afford morphed scaffolds, structural rigidity, and biological activities. Some of the most dramatic structural alterations in natural product biosynthesis occur through oxidative cyclization. In this Review, we examine the different strategies used by nature to create new intra(inter)molecular bonds via redox chemistry. This Review will cover both oxidation- and reduction-enabled cyclization mechanisms, with an emphasis on the former. Radical cyclizations catalyzed by P450, nonheme iron, α-KG-dependent oxygenases, and radical SAM enzymes are discussed to illustrate the use of molecular oxygen and S-adenosylmethionine to forge new bonds at unactivated sites via one-electron manifolds. Nonradical cyclizations catalyzed by flavin-dependent monooxygenases and NAD(P)H-dependent reductases are covered to show the use of two-electron manifolds in initiating cyclization reactions. The oxidative installations of epoxides and halogens into acyclic scaffolds to drive subsequent cyclizations are separately discussed as examples of "disappearing" reactive handles. Last, oxidative rearrangement of rings systems, including contractions and expansions, will be covered.
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Affiliation(s)
- Man-Cheng Tang
- Department of Chemical and Biomolecular Engineering, Department of Chemistry and Biochemistry, University of California, Los Angeles, 420 Westwood Plaza, Los Angeles, CA 90095, USA
| | - Yi Zou
- Department of Chemical and Biomolecular Engineering, Department of Chemistry and Biochemistry, University of California, Los Angeles, 420 Westwood Plaza, Los Angeles, CA 90095, USA
| | - Kenji Watanabe
- Department of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
| | - Christopher T. Walsh
- Stanford University Chemistry, Engineering, and Medicine for Human Health (ChEM-H), Stanford University, 443 Via Ortega, Stanford, CA 94305
| | - Yi Tang
- Department of Chemical and Biomolecular Engineering, Department of Chemistry and Biochemistry, University of California, Los Angeles, 420 Westwood Plaza, Los Angeles, CA 90095, USA
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14
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Wang H, Li W, Qin Y, Pan Y, Wang X, Weng Y, Chen P, Li Y. The Cytochrome P450 Gene CsCYP85A1 Is a Putative Candidate for Super Compact-1 ( Scp-1) Plant Architecture Mutation in Cucumber ( Cucumis sativus L.). FRONTIERS IN PLANT SCIENCE 2017; 8:266. [PMID: 28303144 PMCID: PMC5332357 DOI: 10.3389/fpls.2017.00266] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 02/13/2017] [Indexed: 05/20/2023]
Abstract
The dwarf or compact plant architecture is an important trait in plant breeding. A number of genes controlling plant height have been cloned and functionally characterized which often involve in biosynthesis or signaling of plant hormones such as brassinosteroids (BRs). No genes for plant height or vine length have been cloned in cucurbit crops (family Cucurbitaceae). From an EMS-induced mutagenesis population, we identified a super compact (SCP) mutant C257 which was extremely dwarf due to practically no internode elongation. Under dark growing condition, C257 did not undergo skotomorphogenesis and its mutant phenotype could be rescued with exogenous application of brassinolide (BL), suggesting SCP might be a BR-deficient mutant. Segregation analysis revealed a single recessive gene scp-1 that was responsible for the SCP mutation. Map-based cloning combined with a modified MutMap identified CsCYP85A1, a member of the plant cytochrome P450 monooxygenase gene family, as the most possible candidate gene for scp-1, which encodes a BR-C6-oxidase in the BR biosynthesis pathway. We show that a SNP within the second exon of scp-1 candidate gene caused the SCP phenotype. Three copies of the CsCYP85A gene are present in the cucumber genome, but only the scp-1/CsCYP85A1 gene seemed active. The expression of CsCYP85A1 was higher in flowers than in the leaves and stem; its expression in the wild type (WT) was feedback regulated by BL application. Its expression was reduced in C257 as compared with the WT. This was the first report of map-based cloning of a plant height gene in cucurbit crops. The research highlighted the combined use of linkage mapping, an improved MutMap method and allelic diversity analysis in natural populations in quick cloning of simply inherited genes in cucumber. The roles of CsCYP85A1 in regulation of internode elongation in cucumber was discussed.
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Affiliation(s)
- Hui Wang
- Horticulture College, Northwest A&F UniversityYangling, China
| | - Wanqing Li
- Horticulture College, Northwest A&F UniversityYangling, China
| | - Yaguang Qin
- Horticulture College, Northwest A&F UniversityYangling, China
| | - Yupeng Pan
- Horticulture College, Northwest A&F UniversityYangling, China
- Horticulture Department, University of Wisconsin, MadisonWI, USA
| | - Xiaofeng Wang
- Horticulture College, Northwest A&F UniversityYangling, China
| | - Yiqun Weng
- Horticulture Department, University of Wisconsin, MadisonWI, USA
- Vegetable Crops Research Unit, United States Department of Agriculture–Agricultural Research Service, MadisonWI, USA
| | - Peng Chen
- College of Life Science, Northwest A&F University, YanglingChina
- *Correspondence: Peng Chen, Yuhong Li,
| | - Yuhong Li
- Horticulture College, Northwest A&F UniversityYangling, China
- *Correspondence: Peng Chen, Yuhong Li,
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15
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Llanes A, Andrade A, Alemano S, Luna V. Alterations of Endogenous Hormonal Levels in Plants under Drought and Salinity. ACTA ACUST UNITED AC 2016. [DOI: 10.4236/ajps.2016.79129] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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Weller JL, Foo EM, Hecht V, Ridge S, Vander Schoor JK, Reid JB. Ethylene Signaling Influences Light-Regulated Development in Pea. PLANT PHYSIOLOGY 2015; 169:115-24. [PMID: 25792252 PMCID: PMC4577373 DOI: 10.1104/pp.15.00164] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 03/17/2015] [Indexed: 05/03/2023]
Abstract
Plant responses to light involve a complex network of interactions among multiple plant hormones. In a screen for mutants showing altered photomorphogenesis under red light, we identified a mutant with dramatically enhanced leaf expansion and delayed petal senescence. We show that this mutant exhibits reduced sensitivity to ethylene and carries a nonsense mutation in the single pea (Pisum sativum) ortholog of the ethylene signaling gene ETHYLENE INSENSITIVE2 (EIN2). Consistent with this observation, the ein2 mutation rescues the previously described effects of ethylene overproduction in mature phytochrome-deficient plants. In seedlings, ein2 confers a marked increase in leaf expansion under monochromatic red, far-red, or blue light, and interaction with phytochromeA, phytochromeB, and long1 mutants confirms that ein2 enhances both phytochrome- and cryptochrome-dependent responses in a LONG1-dependent manner. In contrast, minimal effects of ein2 on seedling development in darkness or high-irradiance white light show that ethylene is not limiting for development under these conditions. These results indicate that ethylene signaling constrains leaf expansion during deetiolation in pea and provide further evidence that down-regulation of ethylene production may be an important component mechanism in the broader control of photomorphogenic development by phytochrome and cryptochrome.
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Affiliation(s)
- James L Weller
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Eloise M Foo
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Valérie Hecht
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Stephen Ridge
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | | | - James B Reid
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
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17
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Lam HK, McAdam SAM, McAdam EL, Ross JJ. Evidence That Chlorinated Auxin Is Restricted to the Fabaceae But Not to the Fabeae. PLANT PHYSIOLOGY 2015; 168:798-803. [PMID: 25971549 PMCID: PMC4741347 DOI: 10.1104/pp.15.00410] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Accepted: 05/11/2015] [Indexed: 05/08/2023]
Abstract
Auxin is a pivotal plant hormone, usually occurring in the form of indole-3-acetic acid (IAA). However, in maturing pea (Pisum sativum) seeds, the level of the chlorinated auxin, 4-chloroindole-3-acetic acid (4-Cl-IAA), greatly exceeds that of IAA. A key issue is how plants produce halogenated compounds such as 4-Cl-IAA. To better understand this topic, we investigated the distribution of the chlorinated auxin. We show for the first time, to our knowledge, that 4-Cl-IAA is found in the seeds of Medicago truncatula, Melilotus indicus, and three species of Trifolium. Furthermore, we found no evidence that Pinus spp. synthesize 4-Cl-IAA in seeds, contrary to a previous report. The evidence indicates a single evolutionary origin of 4-Cl-IAA synthesis in the Fabaceae, which may provide an ideal model system to further investigate the action and activity of halogenating enzymes in plants.
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Affiliation(s)
- Hong Kiat Lam
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Scott A M McAdam
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Erin L McAdam
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - John J Ross
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia
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18
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Jöst M, Esfeld K, Burian A, Cannarozzi G, Chanyalew S, Kuhlemeier C, Assefa K, Tadele Z. Semi-dwarfism and lodging tolerance in tef (Eragrostis tef) is linked to a mutation in the α-Tubulin 1 gene. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:933-944. [PMID: 25399019 PMCID: PMC4321551 DOI: 10.1093/jxb/eru452] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Genetic improvement of native crops is a new and promising strategy to combat hunger in the developing world. Tef is the major staple food crop for approximately 50 million people in Ethiopia. As an indigenous cereal, it is well adapted to diverse climatic and soil conditions; however, its productivity is extremely low mainly due to susceptibility to lodging. Tef has a tall and weak stem, liable to lodge (or fall over), which is aggravated by wind, rain, or application of nitrogen fertilizer. To circumvent this problem, the first semi-dwarf lodging-tolerant tef line, called kegne, was developed from an ethyl methanesulphonate (EMS)-mutagenized population. The response of kegne to microtubule-depolymerizing and -stabilizing drugs, as well as subsequent gene sequencing and segregation analysis, suggests that a defect in the α-Tubulin gene is functionally and genetically tightly linked to the kegne phenotype. In diploid species such as rice, homozygous mutations in α-Tubulin genes result in extreme dwarfism and weak stems. In the allotetraploid tef, only one homeologue is mutated, and the presence of the second intact α-Tubulin gene copy confers the agriculturally beneficial semi-dwarf and lodging-tolerant phenotype. Introgression of kegne into locally adapted and popular tef cultivars in Ethiopia will increase the lodging tolerance in the tef germplasm and, as a result, will improve the productivity of this valuable crop.
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Affiliation(s)
- Moritz Jöst
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
| | - Korinna Esfeld
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
| | - Agata Burian
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
| | - Gina Cannarozzi
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
| | - Solomon Chanyalew
- Ethiopian Institute of Agricultural Research, Debre Zeit Agricultural Research Center, PO Box 32, Debre Zeit, Ethiopia
| | - Cris Kuhlemeier
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
| | - Kebebew Assefa
- Ethiopian Institute of Agricultural Research, Debre Zeit Agricultural Research Center, PO Box 32, Debre Zeit, Ethiopia
| | - Zerihun Tadele
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
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19
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Xu Y, Zhang X, Li Q, Cheng Z, Lou H, Ge L, An H. BdBRD1, a brassinosteroid C-6 oxidase homolog in Brachypodium distachyon L., is required for multiple organ development. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2015; 86:91-99. [PMID: 25438141 DOI: 10.1016/j.plaphy.2014.11.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Accepted: 11/20/2014] [Indexed: 05/07/2023]
Abstract
Brassinosteroids (BRs), known as a kind of phytohormones, play essential roles in plant growth and development. Although the studies on the BR biosynthesis and signaling are extensive in Arabidopsis, little is known in temperate cereals. In this study, bdbrd1-1, a T-DNA insertion mutant from Brachypodium distachyon, was isolated and characterized in details. The bdbrd1-1 mutant showed lots of cellular and morphogenetic defects, including shortened cell shapes, severe dwarfing, twisted leaves and sterile spikes. Sequencing the flanking fragment of the T-DNA and complementation by genomic DNA in the mutant, confirmed that the developmental defects are caused by the T-DNA insertion in BdBRD1, a possible brassinosteroid C-6 oxidase gene. Application of 24-epicastasterone could partly rescue the bdbrd1-1 dwarfing phenotype. Expression analysis of BdBRD1 suggested that bdbrd1-1 is probably a null mutant and its wild type transcript is expressed in various tissues and highest in the leaf sheaths. Meanwhile, measurements on leaf numbers of the main stems or days to the emergence of the inflorescences suggested that bdbrd1-1 is late-flowering. The late-flowering phenotype could be converted by vernalization treatment, although there lacks a typical FLC gene in B. distachyon. The current data provide an insight into the relationship between BRs biosynthesis and individual development in B. distachyon, an emerging model plant for the temperate cereals.
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Affiliation(s)
- Yi Xu
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, PR China
| | - Xia Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, PR China
| | - Qi Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, PR China
| | - Zhiyuan Cheng
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, PR China
| | - Haijuan Lou
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, PR China
| | - Lei Ge
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, PR China.
| | - Hailong An
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, PR China.
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20
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de Saint Germain A, Ligerot Y, Dun EA, Pillot JP, Ross JJ, Beveridge CA, Rameau C. Strigolactones stimulate internode elongation independently of gibberellins. PLANT PHYSIOLOGY 2013; 163:1012-25. [PMID: 23943865 PMCID: PMC3793021 DOI: 10.1104/pp.113.220541] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Accepted: 08/08/2013] [Indexed: 05/18/2023]
Abstract
Strigolactone (SL) mutants in diverse species show reduced stature in addition to their extensive branching. Here, we show that this dwarfism in pea (Pisum sativum) is not attributable to the strong branching of the mutants. The continuous supply of the synthetic SL GR24 via the root system using hydroponics can restore internode length of the SL-deficient rms1 mutant but not of the SL-response rms4 mutant, indicating that SLs stimulate internode elongation via RMS4. Cytological analysis of internode epidermal cells indicates that SLs control cell number but not cell length, suggesting that SL may affect stem elongation by stimulating cell division. Consequently, SLs can repress (in axillary buds) or promote (in the stem) cell division in a tissue-dependent manner. Because gibberellins (GAs) increase internode length by affecting both cell division and cell length, we tested if SLs stimulate internode elongation by affecting GA metabolism or signaling. Genetic analyses using SL-deficient and GA-deficient or DELLA-deficient double mutants, together with molecular and physiological approaches, suggest that SLs act independently from GAs to stimulate internode elongation.
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Affiliation(s)
| | | | - Elizabeth A. Dun
- Institut Jean-Pierre Bourgin, INRA UMR1318, INRA-AgroParisTech, F–78000 Versailles, France (A.d.S.G., Y.L., J-P.P., C.R.)
- University of Queensland, School of Biological Sciences, St. Lucia, Queensland 4072 Australia (E.A.D., C.A.B.); and
- School of Plant Science, University of Tasmania, Sandy Bay, Tasmania 7005 Australia (J.J.R.)
| | - Jean-Paul Pillot
- Institut Jean-Pierre Bourgin, INRA UMR1318, INRA-AgroParisTech, F–78000 Versailles, France (A.d.S.G., Y.L., J-P.P., C.R.)
- University of Queensland, School of Biological Sciences, St. Lucia, Queensland 4072 Australia (E.A.D., C.A.B.); and
- School of Plant Science, University of Tasmania, Sandy Bay, Tasmania 7005 Australia (J.J.R.)
| | - John J. Ross
- Institut Jean-Pierre Bourgin, INRA UMR1318, INRA-AgroParisTech, F–78000 Versailles, France (A.d.S.G., Y.L., J-P.P., C.R.)
- University of Queensland, School of Biological Sciences, St. Lucia, Queensland 4072 Australia (E.A.D., C.A.B.); and
- School of Plant Science, University of Tasmania, Sandy Bay, Tasmania 7005 Australia (J.J.R.)
| | - Christine A. Beveridge
- Institut Jean-Pierre Bourgin, INRA UMR1318, INRA-AgroParisTech, F–78000 Versailles, France (A.d.S.G., Y.L., J-P.P., C.R.)
- University of Queensland, School of Biological Sciences, St. Lucia, Queensland 4072 Australia (E.A.D., C.A.B.); and
- School of Plant Science, University of Tasmania, Sandy Bay, Tasmania 7005 Australia (J.J.R.)
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Zhao B, Li J. Regulation of brassinosteroid biosynthesis and inactivation. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2012; 54:746-59. [PMID: 22963251 DOI: 10.1111/j.1744-7909.2012.01168.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Brassinosteroids (BRs) are a group of naturally-occurring steroidal phytohormones playing fundamental roles during normal plant growth and development. Using a combination of experimental approaches, including analytical chemistry, genetics, and biochemistry, the major BR biosynthetic pathway has been largely elucidated. The least-understood knowledge in the BR research field is probably the molecular mechanisms controlling the bioactive levels of BRs in response to various developmental and environmental cues. In this review, we focus our discussion on a recently-proposed, 8-step predominant BR biosynthetic pathway, several newly-identified transcription factors regulating the expression of key enzymes that catalyze BR biosynthesis, and up-to-date information about the mechanisms that plants use to inactivate unnecessary BRs.
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Affiliation(s)
- Baolin Zhao
- Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
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Symons G, Chua YJ, Ross J, Quittenden L, Davies N, Reid J. Hormonal changes during non-climacteric ripening in strawberry. JOURNAL OF EXPERIMENTAL BOTANY 2012; 63:4741-50. [PMID: 22791823 PMCID: PMC3428006 DOI: 10.1093/jxb/ers147] [Citation(s) in RCA: 160] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
In contrast to climacteric fruits, where ethylene is known to be pivotal, the regulation of ripening in non-climacteric fruits is not well understood. In the non-climacteric strawberry (Fragaria anannassa), auxin and abscisic acid (ABA) are thought to be important, but the roles of other hormones suggested to be involved in fruit development and ripening are not clear. Here changes in the levels of indole-3-acetic acid (IAA), ABA, GA1, and castasterone from anthesis to fully ripened fruit are reported. The levels of IAA and GA1 rise early in fruit development before dropping to low levels prior to colour accumulation. Castasterone levels are highest at anthesis and drop to very low levels well before ripening commences, suggesting that brassinosteroids do not play an important role in ripening in strawberry. ABA levels are low at anthesis and gradually rise through development and ripening. The synthetic auxin, 1-naphthaleneacetic acid (NAA), can delay ripening, but the application of GA3, the gibberellin biosythesis inhibitor paclobutrazol, and ABA had no significant effect. IAA and ABA levels are higher in the developing achenes than in the receptacle tissue and may be important for receptacle enlargement and ripening, and seed maturation, respectively. Contrary to a recent report, the biologically active GA4 was not detected. The pattern of changes in the levels of the hormones are different from those reported in another well studied non-climateric fruit, grape, suggesting that a single consistent pattern of hormone changes does not occur in this group of fruit during ripening.
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Affiliation(s)
- G.M. Symons
- School of Plant Science, University of TasmaniaPrivate Bag 55, Hobart, Tasmania 7001, Australia
| | - Y.-J. Chua
- School of Plant Science, University of TasmaniaPrivate Bag 55, Hobart, Tasmania 7001, Australia
| | - J.J. Ross
- School of Plant Science, University of TasmaniaPrivate Bag 55, Hobart, Tasmania 7001, Australia
| | - L.J. Quittenden
- School of Plant Science, University of TasmaniaPrivate Bag 55, Hobart, Tasmania 7001, Australia
| | - N.W. Davies
- School of Plant Science, University of TasmaniaPrivate Bag 55, Hobart, Tasmania 7001, Australia
| | - J.B. Reid
- School of Plant Science, University of TasmaniaPrivate Bag 55, Hobart, Tasmania 7001, Australia
- To whom correspondence should be addressed. E-mail:
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Makarevitch I, Thompson A, Muehlbauer GJ, Springer NM. Brd1 gene in maize encodes a brassinosteroid C-6 oxidase. PLoS One 2012; 7:e30798. [PMID: 22292043 PMCID: PMC3266906 DOI: 10.1371/journal.pone.0030798] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Accepted: 12/29/2011] [Indexed: 11/18/2022] Open
Abstract
The role of brassinosteroids in plant growth and development has been well-characterized in a number of plant species. However, very little is known about the role of brassinosteroids in maize. Map-based cloning of a severe dwarf mutant in maize revealed a nonsense mutation in an ortholog of a brassinosteroid C-6 oxidase, termed brd1, the gene encoding the enzyme that catalyzes the final steps of brassinosteroid synthesis. Homozygous brd1–m1 maize plants have essentially no internode elongation and exhibit no etiolation response when germinated in the dark. These phenotypes could be rescued by exogenous application of brassinolide, confirming the molecular defect in the maize brd1-m1 mutant. The brd1-m1 mutant plants also display alterations in leaf and floral morphology. The meristem is not altered in size but there is evidence for differences in the cellular structure of several tissues. The isolation of a maize mutant defective in brassinosteroid synthesis will provide opportunities for the analysis of the role of brassinosteroids in this important crop system.
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Affiliation(s)
- Irina Makarevitch
- Department of Biology, Hamline University, Saint Paul, Minnesota, United States of America.
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Ross JJ, Weston DE, Davidson SE, Reid JB. Plant hormone interactions: how complex are they? PHYSIOLOGIA PLANTARUM 2011; 141:299-309. [PMID: 21214880 DOI: 10.1111/j.1399-3054.2011.01444.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Models describing plant hormone interactions are often complex and web-like. Here we assess several suggested interactions within one experimental system, elongating pea internodes. Results from this system indicate that at least some suggested interactions between auxin, gibberellins (GAs), brassinosteroids (BRs), abscisic acid (ABA) and ethylene do not occur in this system or occur in the reverse direction to that suggested. Furthermore, some of the interactions are relatively weak and may be of little physiological relevance. This is especially true if plant hormones are assumed to show a log-linear response curve as many empirical results suggest. Although there is strong evidence to support some interactions between hormones (e.g. auxin stimulating ethylene and bioactive GA levels), at least some of the web-like complexities do not appear to be justified or are overstated. Simpler and more targeted models may be developed by dissecting out key interactions with major physiological effects.
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Affiliation(s)
- John J Ross
- School of Plant Science, University of Tasmania, Private Bag 55, Hobart, Tasmania 7001, Australia
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Tivendale ND, Davies NW, Molesworth PP, Davidson SE, Smith JA, Lowe EK, Reid JB, Ross JJ. Reassessing the role of N-hydroxytryptamine in auxin biosynthesis. PLANT PHYSIOLOGY 2010; 154:1957-65. [PMID: 20974893 PMCID: PMC2996026 DOI: 10.1104/pp.110.165803] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Accepted: 10/22/2010] [Indexed: 05/18/2023]
Abstract
The tryptamine pathway is one of five proposed pathways for the biosynthesis of indole-3-acetic acid (IAA), the primary auxin in plants. The enzymes AtYUC1 (Arabidopsis thaliana), FZY (Solanum lycopersicum), and ZmYUC (Zea mays) are reported to catalyze the conversion of tryptamine to N-hydroxytryptamine, putatively a rate-limiting step of the tryptamine pathway for IAA biosynthesis. This conclusion was based on in vitro assays followed by mass spectrometry or HPLC analyses. However, there are major inconsistencies between the mass spectra reported for the reaction products. Here, we present mass spectral data for authentic N-hydroxytryptamine, 5-hydroxytryptamine (serotonin), and tryptamine to demonstrate that at least some of the published mass spectral data for the YUC in vitro product are not consistent with N-hydroxytryptamine. We also show that tryptamine is not metabolized to IAA in pea (Pisum sativum) seeds, even though a PsYUC-like gene is strongly expressed in these organs. Combining these findings, we propose that at present there is insufficient evidence to consider N-hydroxytryptamine an intermediate for IAA biosynthesis.
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Quittenden LJ, Davies NW, Smith JA, Molesworth PP, Tivendale ND, Ross JJ. Auxin biosynthesis in pea: characterization of the tryptamine pathway. PLANT PHYSIOLOGY 2009; 151:1130-8. [PMID: 19710233 PMCID: PMC2773097 DOI: 10.1104/pp.109.141507] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2009] [Accepted: 08/24/2009] [Indexed: 05/18/2023]
Abstract
One pathway leading to the bioactive auxin, indole-3-acetic acid (IAA), is known as the tryptamine pathway, which is suggested to proceed in the sequence: tryptophan (Trp), tryptamine, N-hydroxytryptamine, indole-3-acetaldoxime, indole-3-acetaldehyde (IAAld), IAA. Recently, this pathway has been characterized by the YUCCA genes in Arabidopsis (Arabidopsis thaliana) and their homologs in other species. YUCCA is thought to be responsible for the conversion of tryptamine to N-hydroxytryptamine. Here we complement the genetic findings with a compound-based approach in pea (Pisum sativum), detecting potential precursors by gas chromatography/tandem-mass spectrometry. In addition, we have synthesized deuterated forms of many of the intermediates involved, and have used them to quantify the endogenous compounds, and to investigate their metabolic fates. Trp, tryptamine, IAAld, indole-3-ethanol, and IAA were detected as endogenous constituents, whereas indole-3-acetaldoxime and one of its products, indole-3-acetonitrile, were not detected. Metabolism experiments indicated that the tryptamine pathway to IAA in pea roots proceeds in the sequence: Trp, tryptamine, IAAld, IAA, with indole-3-ethanol as a side-branch product of IAAld. N-hydroxytryptamine was not detected, but we cannot exclude that it is an intermediate between tryptamine and IAAld, nor can we rule out the possibility of a Trp-independent pathway operating in pea roots.
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Affiliation(s)
| | | | | | | | | | - John J. Ross
- School of Plant Science (L.J.Q., N.D.T., J.J.R.), School of Chemistry (J.A.S., P.P.M.), and Central Science Laboratory (N.W.D.), University of Tasmania, Hobart, Tasmania 7001, Australia
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Kim BK, Fujioka S, Takatsuto S, Tsujimoto M, Choe S. Castasterone is a likely end product of brassinosteroid biosynthetic pathway in rice. Biochem Biophys Res Commun 2008; 374:614-9. [DOI: 10.1016/j.bbrc.2008.07.073] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2008] [Accepted: 07/10/2008] [Indexed: 10/21/2022]
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Symons GM, Reid JB. Brassinosteroids, de-etiolation and the re-emerging art of plant hormone quantification. PLANT SIGNALING & BEHAVIOR 2008; 3:868-70. [PMID: 19704525 PMCID: PMC2634400 DOI: 10.4161/psb.3.10.6063] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2008] [Accepted: 04/08/2008] [Indexed: 05/23/2023]
Abstract
An increase in the use of molecular techniques has provided a significant insight into the function of genes, and how they are regulated and interact. However, in the field of plant hormone physiology, the increased use of these techniques has been accompanied by a reduction in the direct measurement of plant hormone levels by physiochemical methods. Instead, the transcript (mRNA) levels of genes involved in hormone metabolism are often used to predict endogenous hormone levels. The validity of this approach was recently tested by comparing the expression of a range of genes involved in BR synthesis, catabolism and perception, with the actual endogenous BR levels in pea seedlings grown under different light conditions.1,2 Based on this comparison, we now argue that gene expression analysis alone is not always a reliable indicator of endogenous hormone levels.
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Affiliation(s)
- Gregory M Symons
- School of Plant Science; University of Tasmania; Hobart, Tasmania Australia
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Symons GM, Smith JJ, Nomura T, Davies NW, Yokota T, Reid JB. The hormonal regulation of de-etiolation. PLANTA 2008; 227:1115-25. [PMID: 18214530 DOI: 10.1007/s00425-007-0685-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2007] [Accepted: 12/13/2007] [Indexed: 05/25/2023]
Abstract
De-etiolation involves a number of phenotypic changes as the plants shift from a dark-grown (etiolated) to a light-grown (de-etiolated) morphology. Whilst these light-induced, morphological changes are thought to be mediated by plant hormones, the precise mechanism/s are not yet fully understood. Here we provide further direct evidence that gibberellins (GAs) may play an important role in de-etiolation, because a similar light-induced reduction in bioactive GA levels was detected in barley (Hordeum vulgare L.), Arabidopsis (Arabidopsis thaliana L.), and pea (Pisum sativum L.). This is indicative of a highly conserved, negative-regulatory role for GAs in de-etiolation, in a range of taxonomically diverse species. In contrast, we found no direct evidence of a reduction in brassinosteroid (BR) levels during de-etiolation in any of these species.
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Affiliation(s)
- Gregory M Symons
- School of Plant Science, University of Tasmania, Hobart, Tasmania, Australia.
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Nomura T, Ueno M, Yamada Y, Takatsuto S, Takeuchi Y, Yokota T. Roles of brassinosteroids and related mRNAs in pea seed growth and germination. PLANT PHYSIOLOGY 2007; 143:1680-8. [PMID: 17322340 PMCID: PMC1851827 DOI: 10.1104/pp.106.093096] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2006] [Accepted: 02/16/2007] [Indexed: 05/14/2023]
Abstract
The levels of endogenous brassinosteroids (BRs) and the expression of the biosynthesis/metabolism/perception genes involved have been investigated during the development and germination of pea (Pisum sativum) seeds. When seeds were rapidly growing, the level of biologically active BRs (brassinolide [BL] and castasterone [CS]) and the transcript levels of two BR C-6 oxidases (CYP85A1 and CYP85A6) reached a maximum, suggesting the significance of BL and CS in seed development. In the early stages of germination, CS, but not BL, appeared and its level increased in the growing tissues in which the transcript level of CYP85A1 and CYP85A6 was high, suggesting the significance of CS in seed germination and early seedling growth of pea. 6-Deoxocathasterone (6-deoxoCT) was the quantitatively major BR in mature seeds. At the early stage of germination, the level of 6-deoxoCT was specifically decreased, whereas the levels of downstream intermediates were increased. It seems that 6-deoxoCT is the major storage BR and is utilized during germination and early growth stages. The level of the mRNAs of BR biosynthesis and perception genes fluctuated during seed development. In mature seeds, most of mRNAs were present, but the level was generally lower compared with immature seeds. However, CYP90A9 mRNA rapidly increased during seed development and reached the maximum in mature seeds. The mRNAs stored in mature pea seeds seem to be utilized when seeds germinate. However, it was found that de novo transcription of mRNAs also starts as early as during seed imbibition.
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Affiliation(s)
- Takahito Nomura
- Department of Biosciences, Teikyo University, Utsunomiya 320-8551, Japan
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