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Jing XQ, Shi PT, Zhang R, Zhou MR, Shalmani A, Wang GF, Liu WT, Li WQ, Chen KM. Rice kinase OsMRLK63 contributes to drought tolerance by regulating reactive oxygen species production. PLANT PHYSIOLOGY 2024; 194:2679-2696. [PMID: 38146904 DOI: 10.1093/plphys/kiad684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 10/16/2023] [Accepted: 11/10/2023] [Indexed: 12/27/2023]
Abstract
Drought is a major adverse environmental factor that plants face in nature but the molecular mechanism by which plants transduce stress signals and further endow themselves with tolerance remains unclear. Malectin/malectin-like domains containing receptor-like kinases (MRLKs) have been proposed to act as receptors in multiple biological signaling pathways, but limited studies show their roles in drought-stress signaling and tolerance. In this study, we demonstrate OsMRLK63 in rice (Oryza sativa L.) functions in drought tolerance by acting as the receptor of 2 rapid alkalization factors, OsRALF45 and OsRALF46. We show OsMRLK63 is a typical receptor-like kinase that positively regulates drought tolerance and reactive oxygen species (ROS) production. OsMRLK63 interacts with and phosphorylates several nicotinamide adenine dinucleotide phosphate (NADPH) oxidases with the primarily phosphorylated site at Ser26 in the N-terminal of RESPIRATORY BURST OXIDASE HOMOLOGUE A (OsRbohA). The application of the 2 small signal peptides (OsRALF45/46) on rice can greatly alleviate the dehydration of plants induced by mimic drought. This function depends on the existence of OsMRLK63 and the NADPH oxidase-dependent ROS production. The 2 RALFs interact with OsMRLK63 by binding to its extracellular domain, suggesting they may act as drought/dehydration signal sensors for the OsMRLK63-mediated process. Our study reveals a OsRALF45/46-OsMRLK63-OsRbohs module which contributes to drought-stress signaling and tolerance in rice.
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Affiliation(s)
- Xiu-Qing Jing
- National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
- College of Biological Sciences and Technology, Taiyuan Normal University, Taiyuan, Shanxi 030619, China
| | - Peng-Tao Shi
- National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Ran Zhang
- National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Meng-Ru Zhou
- National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Abdullah Shalmani
- National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Gang-Feng Wang
- National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Wen-Ting Liu
- National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Wen-Qiang Li
- National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Kun-Ming Chen
- National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
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Chen J, Liu Y, Liu M, Guo W, Wang Y, He Q, Chen W, Liao Y, Zhang W, Gao Y, Dong K, Ren R, Yang T, Zhang L, Qi M, Li Z, Zhao M, Wang H, Wang J, Qiao Z, Li H, Jiang Y, Liu G, Song X, Deng Y, Li H, Yan F, Dong Y, Li Q, Li T, Yang W, Cui J, Wang H, Zhou Y, Zhang X, Jia G, Lu P, Zhi H, Tang S, Diao X. Pangenome analysis reveals genomic variations associated with domestication traits in broomcorn millet. Nat Genet 2023; 55:2243-2254. [PMID: 38036791 PMCID: PMC10703678 DOI: 10.1038/s41588-023-01571-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 10/17/2023] [Indexed: 12/02/2023]
Abstract
Broomcorn millet (Panicum miliaceum L.) is an orphan crop with the potential to improve cereal production and quality, and ensure food security. Here we present the genetic variations, population structure and diversity of a diverse worldwide collection of 516 broomcorn millet genomes. Population analysis indicated that the domesticated broomcorn millet originated from its wild progenitor in China. We then constructed a graph-based pangenome of broomcorn millet based on long-read de novo genome assemblies of 32 representative accessions. Our analysis revealed that the structural variations were highly associated with transposable elements, which influenced gene expression when located in the coding or regulatory regions. We also identified 139 loci associated with 31 key domestication and agronomic traits, including candidate genes and superior haplotypes, such as LG1, for panicle architecture. Thus, the study's findings provide foundational resources for developing genomics-assisted breeding programs in broomcorn millet.
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Affiliation(s)
- Jinfeng Chen
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
| | - Yang Liu
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Minxuan Liu
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Wenlei Guo
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yongqiang Wang
- Institute of Cotton, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, China
| | - Qiang He
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Weiyao Chen
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yi Liao
- College of Horticulture, South China Agricultural University, Guangzhou, China
| | - Wei Zhang
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yuanzhu Gao
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Kongjun Dong
- Crop Research Institute, Gansu Academy of Agricultural Sciences, Lanzhou, China
| | - Ruiyu Ren
- Crop Research Institute, Gansu Academy of Agricultural Sciences, Lanzhou, China
| | - Tianyu Yang
- Crop Research Institute, Gansu Academy of Agricultural Sciences, Lanzhou, China
| | - Liyuan Zhang
- Chifeng Academy of Agricultural and Animal Husbandry Sciences, Chifeng, China
| | - Mingyu Qi
- Chifeng Academy of Agricultural and Animal Husbandry Sciences, Chifeng, China
| | - Zhiguang Li
- Chifeng Academy of Agricultural and Animal Husbandry Sciences, Chifeng, China
| | - Min Zhao
- Chifeng Academy of Agricultural and Animal Husbandry Sciences, Chifeng, China
| | - Haigang Wang
- Center for Agricultural Genetic Resources Research, Shanxi Agricultural University, Taiyuan, China
| | - Junjie Wang
- Center for Agricultural Genetic Resources Research, Shanxi Agricultural University, Taiyuan, China
| | - Zhijun Qiao
- Center for Agricultural Genetic Resources Research, Shanxi Agricultural University, Taiyuan, China
| | - Haiquan Li
- Institute of Millet Crops, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, China
| | - Yanmiao Jiang
- Institute of Millet Crops, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, China
| | - Guoqing Liu
- Institute of Millet Crops, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, China
| | - Xiaoqiang Song
- High Latitude Crops Institute to Shanxi Academy, Shanxi Agricultural University (Shanxi Academy of Agricultural Sciences), Datong, China
| | - Yarui Deng
- High Latitude Crops Institute to Shanxi Academy, Shanxi Agricultural University (Shanxi Academy of Agricultural Sciences), Datong, China
| | - Hai Li
- High Latitude Crops Institute to Shanxi Academy, Shanxi Agricultural University (Shanxi Academy of Agricultural Sciences), Datong, China
| | - Feng Yan
- Qiqihar Sub-academy of Heilongjiang Academy of Agricultural Sciences, Qiqihar, China
| | - Yang Dong
- Qiqihar Sub-academy of Heilongjiang Academy of Agricultural Sciences, Qiqihar, China
| | - Qingquan Li
- Qiqihar Sub-academy of Heilongjiang Academy of Agricultural Sciences, Qiqihar, China
| | - Tao Li
- Institute of Crop Sciences, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot, China
| | - Wenyao Yang
- Institute of Crop Sciences, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot, China
| | - Jianghui Cui
- College of Agronomy, Hebei Agricultural University, Baoding, China
| | - Hongru Wang
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Yongfeng Zhou
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Xiaoming Zhang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Guanqing Jia
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Ping Lu
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Hui Zhi
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Sha Tang
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
| | - Xianmin Diao
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
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Cheng Y, Li Y, Yang J, He H, Zhang X, Liu J, Yang X. Multiplex CRISPR-Cas9 knockout of EIL3, EIL4, and EIN2L advances soybean flowering time and pod set. BMC PLANT BIOLOGY 2023; 23:519. [PMID: 37884905 PMCID: PMC10604859 DOI: 10.1186/s12870-023-04543-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 10/18/2023] [Indexed: 10/28/2023]
Abstract
BACKGROUND Ethylene inhibitor treatment of soybean promotes flower bud differentiation and early flowering, suggested that there is a close relationship between ethylene signaling and soybean growth and development. The short-lived ETHYLENE INSENSITIVE2 (EIN2) and ETHYLENE INSENSITIVE3 (EIN3) proteins play central roles in plant development. The objective of this study was carried out gene editing of EIL family members in soybeans and to examine the effects on soybean yield and other markers of growth. METHODS AND RESULTS By editing key-node genes in the ethylene signaling pathway using a multi-sgRNA-in-one strategy, we obtained a series of gene edited lines with variable edit combinations among 15 target genes. EIL3, EIL4, and EIN2L were editable genes favored by the T0 soybean lines. Pot experiments also show that the early flowering stage R1 of the EIL3, EIL4, and EIN2L triple mutant was 7.05 d earlier than that of the wild-type control. The yield of the triple mutant was also increased, being 1.65-fold higher than that of the control. Comparative RNA-seq revealed that sucrose synthase, AUX28, MADS3, type-III polyketide synthase A/B, ABC transporter G family member 26, tetraketide alpha-pyrone reductase, and fatty acyl-CoA reductase 2 may be involved in regulating early flowering and high-yield phenotypes in triple mutant soybean plants. CONCLUSION Our results provide a scientific basis for genetic modification to promote the development of earlier-flowering and higher-yielding soybean cultivars.
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Affiliation(s)
- Yunqing Cheng
- Jilin Provincial Key Laboratory of Plant Resource Science and Green Production, Jilin Normal University, Siping, Jilin Province, 136000, China
| | - Yujie Li
- Jilin Provincial Key Laboratory of Plant Resource Science and Green Production, Jilin Normal University, Siping, Jilin Province, 136000, China
| | - Jing Yang
- Jilin Provincial Key Laboratory of Agricultural Biotechnology, Jilin Academy of Agricultural Sciences, Changchun, 130024, China
| | - Hongli He
- Jilin Provincial Key Laboratory of Plant Resource Science and Green Production, Jilin Normal University, Siping, Jilin Province, 136000, China
| | - Xingzheng Zhang
- Jilin Provincial Key Laboratory of Plant Resource Science and Green Production, Jilin Normal University, Siping, Jilin Province, 136000, China
| | - Jianfeng Liu
- Jilin Provincial Key Laboratory of Plant Resource Science and Green Production, Jilin Normal University, Siping, Jilin Province, 136000, China.
| | - Xiangdong Yang
- Jilin Provincial Key Laboratory of Agricultural Biotechnology, Jilin Academy of Agricultural Sciences, Changchun, 130024, China.
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Jing X, Deng N, Shalmani A. Characterization of Malectin/Malectin-like Receptor-like Kinase Family Members in Foxtail Millet ( Setaria italica L.). Life (Basel) 2023; 13:1302. [PMID: 37374087 DOI: 10.3390/life13061302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 05/26/2023] [Accepted: 05/29/2023] [Indexed: 06/29/2023] Open
Abstract
Plant malectin/malectin-like receptor-like kinases (MRLKs) play crucial roles throughout the life course of plants. Here, we identified 23 SiMRLK genes from foxtail millet. All the SiMRLK genes were named according to the chromosomal distribution of the SiMRLKs in the foxtail millet genome and grouped into five subfamilies based on phylogenetic relationships and structural features. Synteny analysis indicated that gene duplication events may take part in the evolution of SiMRLK genes in foxtail millet. The expression profiles of 23 SiMRLK genes under abiotic stresses and hormonal applications were evaluated through qRT-PCR. The expression of SiMRLK1, SiMRLK3, SiMRLK7 and SiMRLK19 were significantly affected by drought, salt and cold stresses. Exogenous ABA, SA, GA and MeJA also obviously changed the transcription levels of SiMRLK1, SiMRLK3, SiMRLK7 and SiMRLK19. These results signified that the transcriptional patterns of SiMRLKs showed diversity and complexity in response to abiotic stresses and hormonal applications in foxtail millet.
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Affiliation(s)
- Xiuqing Jing
- Department of Biology, Taiyuan Normal University, Jinzhong 030619, China
- College of Life Science, Shanxi University, Taiyuan 030006, China
| | - Ning Deng
- Department of Biology, Taiyuan Normal University, Jinzhong 030619, China
| | - Abdullah Shalmani
- National Key Laboratory for Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
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5
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Verma A, Lin M, Smith D, Walker JC, Hewezi T, Davis EL, Hussey RS, Baum TJ, Mitchum MG. A novel sugar beet cyst nematode effector 2D01 targets the Arabidopsis HAESA receptor-like kinase. MOLECULAR PLANT PATHOLOGY 2022; 23:1765-1782. [PMID: 36069343 PMCID: PMC9644282 DOI: 10.1111/mpp.13263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/10/2022] [Accepted: 08/11/2022] [Indexed: 06/15/2023]
Abstract
Plant-parasitic cyst nematodes use a stylet to deliver effector proteins produced in oesophageal gland cells into root cells to cause disease in plants. These effectors are deployed to modulate plant defence responses and developmental programmes for the formation of a specialized feeding site called a syncytium. The Hg2D01 effector gene, coding for a novel 185-amino-acid secreted protein, was previously shown to be up-regulated in the dorsal gland of parasitic juveniles of the soybean cyst nematode Heterodera glycines, but its function has remained unknown. Genome analyses revealed that Hg2D01 belongs to a highly diversified effector gene family in the genomes of H. glycines and the sugar beet cyst nematode Heterodera schachtii. For functional studies using the model Arabidopsis thaliana-H. schachtii pathosystem, we cloned the orthologous Hs2D01 sequence from H. schachtii. We demonstrate that Hs2D01 is a cytoplasmic effector that interacts with the intracellular kinase domain of HAESA (HAE), a cell surface-associated leucine-rich repeat (LRR) receptor-like kinase (RLK) involved in signalling the activation of cell wall-remodelling enzymes important for cell separation during abscission and lateral root emergence. Furthermore, we show that AtHAE is expressed in the syncytium and, therefore, could serve as a viable host target for Hs2D01. Infective juveniles effectively penetrated the roots of HAE and HAESA-LIKE2 (HSL2) double mutant plants; however, fewer nematodes developed on the roots, consistent with a role for this receptor family in nematode infection. Taken together, our results suggest that the Hs2D01-AtHAE interaction may play an important role in sugar beet cyst nematode parasitism.
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Affiliation(s)
- Anju Verma
- Department of Plant Pathology and Institute of Plant Breeding, Genetics, and GenomicsUniversity of GeorgiaAthensGeorgiaUSA
- Division of Plant Sciences and Bond Life Sciences CenterUniversity of MissouriColumbiaMissouriUSA
| | - Marriam Lin
- Division of Plant Sciences and Bond Life Sciences CenterUniversity of MissouriColumbiaMissouriUSA
- Boyle Frederickson Intellectual Property LawMilwaukeeWisconsinUSA
| | - Dante Smith
- Division of Plant Sciences and Bond Life Sciences CenterUniversity of MissouriColumbiaMissouriUSA
- Conagra Brands, Inc., Corporate Microbiology, Research and DevelopmentOmahaNebraskaUSA
| | - John C. Walker
- Division of Biological SciencesUniversity of MissouriColumbiaMissouriUSA
| | - Tarek Hewezi
- Department of Plant SciencesUniversity of TennesseeKnoxvilleTennesseeUSA
| | - Eric L. Davis
- Department of Entomology and Plant PathologyNorth Carolina State UniversityRaleighNorth CarolinaUSA
| | - Richard S. Hussey
- Department of Plant Pathology and Institute of Plant Breeding, Genetics, and GenomicsUniversity of GeorgiaAthensGeorgiaUSA
| | - Thomas J. Baum
- Department of Plant Pathology and MicrobiologyIowa State UniversityAmesIowaUSA
| | - Melissa G. Mitchum
- Department of Plant Pathology and Institute of Plant Breeding, Genetics, and GenomicsUniversity of GeorgiaAthensGeorgiaUSA
- Division of Plant Sciences and Bond Life Sciences CenterUniversity of MissouriColumbiaMissouriUSA
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Xu YY, Liu SR, Gan ZM, Zeng RF, Zhang JZ, Hu CG. High-Density Genetic Map Construction and Identification of QTLs Controlling Leaf Abscission Trait in Poncirus trifoliata. Int J Mol Sci 2021; 22:ijms22115723. [PMID: 34072027 PMCID: PMC8198561 DOI: 10.3390/ijms22115723] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 05/06/2021] [Accepted: 05/24/2021] [Indexed: 11/16/2022] Open
Abstract
A high-density genetic linkage map is essential for genetic and genomic studies including QTL mapping, genome assembly, and comparative genomic analysis. Here, we constructed a citrus high-density linkage map using SSR and SNP markers, which are evenly distributed across the citrus genome. The integrated linkage map contains 4163 markers with an average distance of 1.12 cM. The female and male linkage maps contain 1478 and 2976 markers with genetic lengths of 1093.90 cM and 1227.03 cM, respectively. Meanwhile, a genetic map comparison demonstrates that the linear order of common markers is highly conserved between the clementine mandarin and Poncirus trifoliata. Based on this high-density integrated citrus genetic map and two years of deciduous phenotypic data, two loci conferring leaf abscission phenotypic variation were detected on scaffold 1 (including 36 genes) and scaffold 8 (including 107 genes) using association analysis. Moreover, the expression patterns of 30 candidate genes were investigated under cold stress conditions because cold temperature is closely linked with the deciduous trait. The developed high-density genetic map will facilitate QTL mapping and genomic studies, and the localization of the leaf abscission deciduous trait will be valuable for understanding the mechanism of this deciduous trait and citrus breeding.
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Affiliation(s)
| | | | | | | | - Jin-Zhi Zhang
- Correspondence: (J.-Z.Z.); (C.-G.H.); Tel.: +86-27-8728-2010 (J.-Z.Z. & C.-G.H.)
| | - Chun-Gen Hu
- Correspondence: (J.-Z.Z.); (C.-G.H.); Tel.: +86-27-8728-2010 (J.-Z.Z. & C.-G.H.)
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Characterization of Two Ethephon-Induced IDA-Like Genes from Mango, and Elucidation of Their Involvement in Regulating Organ Abscission. Genes (Basel) 2021; 12:genes12030439. [PMID: 33808710 PMCID: PMC8003476 DOI: 10.3390/genes12030439] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 03/12/2021] [Accepted: 03/15/2021] [Indexed: 11/17/2022] Open
Abstract
In mango (Mangifera indica L.), fruitlet abscission limits productivity. The INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) peptide acts as a key component controlling abscission events in Arabidopsis. IDA-like peptides may assume similar roles in fruit trees. In this study, we isolated two mango IDA-like encoding-genes, MiIDA1 and MiIDA2. We used mango fruitlet-bearing explants and fruitlet-bearing trees, in which fruitlets abscission was induced using ethephon. We monitored the expression profiles of the two MiIDA-like genes in control and treated fruitlet abscission zones (AZs). In both systems, qRT-PCR showed that, within 24 h, both MiIDA-like genes were induced by ethephon, and that changes in their expression profiles were associated with upregulation of different ethylene signaling-related and cell-wall modifying genes. Furthermore, ectopic expression of both genes in Arabidopsis promoted floral-organ abscission, and was accompanied by an early increase in the cytosolic pH of floral AZ cells-a phenomenon known to be linked with abscission, and by activation of cell separation in vestigial AZs. Finally, overexpression of both genes in an Atida mutant restored its abscission ability. Our results suggest roles for MiIDA1 and MiIDA2 in affecting mango fruitlet abscission. Based on our results, we propose new possible modes of action for IDA-like proteins in regulating organ abscission.
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Parra R, Gomez-Jimenez MC. Spatio-temporal immunolocalization of extensin protein and hemicellulose polysaccharides during olive fruit abscission. PLANTA 2020; 252:32. [PMID: 32757074 DOI: 10.1007/s00425-020-03439-6] [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: 05/27/2020] [Accepted: 07/29/2020] [Indexed: 06/11/2023]
Abstract
Immunocytochemical and molecular analyses reveal that the disassembly of the cell wall may be mediated by changes in the level and subcellular location of extensin protein and hemicelluloses during olive-fruit abscission. Although cell-wall modification is believed to underlie the changes in organ abscission, information concerning the changes in cell-wall proteins and hemicellulose polysaccharides is still limited. The aim of this work was to analyze the spatio-temporal patterns of the distribution of different extensin proteins and hemicelluloses in the abscission zone (AZ) during natural ripe-fruit abscission in olive (Olea europaea L.). In this study, we employed immunogold labeling in the ripe-fruit AZ during olive AZ cell separation, using an expanded set of monoclonal antibodies that recognize different types of hemicelluloses (LM11, LM15, and LM21), callose (anti-(1,3)-β-D-glucan) and extensin (JIM19) epitopes, and transmission electron microscopy imaging. Our data demonstrate that AZ cell separation was accompanied by a loss of the JIM19 extensin epitopes and a reduction in the detection of the LM15 xyloglucan epitopes in AZ cell walls, whereas AZ cells were found to be enriched with respect to the xylan and callose levels of the cell wall during olive ripe-fruit abscission. By contrast, AZ cell-wall polysaccharide remodeling did not involve mannans. Moreover, in ripe-fruit AZ, quantitative RT-PCR analysis revealed that OeEXT1, OeEXT2, OeXTH9, and OeXTH13 genes were downregulated during abscission, whereas the expression of OeXTH1, OeXTH5, and OeXTH14 genes increased during abscission. Taken together, the results indicate that AZ cell-wall dynamics during olive ripe-fruit abscission involves extensin protein and hemicellulose modifications, as well as related expressed genes. This is the first study available demonstrating temporal degradation of extensin protein and hemicelluloses in the AZ at the subcellular level.
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Affiliation(s)
- Ruben Parra
- Department of Plant Physiology, Faculty of Science, University of Extremadura, Avda de Elvas s/n, 06006, Badajoz, Spain
| | - Maria C Gomez-Jimenez
- Department of Plant Physiology, Faculty of Science, University of Extremadura, Avda de Elvas s/n, 06006, Badajoz, Spain.
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9
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Parra R, Paredes MA, Labrador J, Nunes C, Coimbra MA, Fernandez-Garcia N, Olmos E, Gallardo M, Gomez-Jimenez MC. Cell Wall Composition and Ultrastructural Immunolocalization of Pectin and Arabinogalactan Protein during Olea europaea L. Fruit Abscission. PLANT & CELL PHYSIOLOGY 2020; 61:814-825. [PMID: 32016408 DOI: 10.1093/pcp/pcaa009] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 01/24/2020] [Indexed: 06/10/2023]
Abstract
Cell wall modification is integral to many plant developmental processes where cells need to separate, such as abscission. However, changes in cell wall composition during natural fruit abscission are poorly understood. In olive (Olea europaea L.), some cultivars such as 'Picual' undergo massive natural fruit abscission after fruit ripening. This study investigates the differences in cell wall polysaccharide composition and the localization of pectins and arabinogalactan protein (AGP) in the abscission zone (AZ) during cell separation to understand fruit abscission control in 'Picual' olive. To this end, immunogold labeling employing a suite of monoclonal antibodies to cell wall components (JIM13, LM5, LM6, LM19 and LM20) was investigated in olive fruit AZ. Cell wall polysaccharide extraction revealed that the AZ cell separation is related to the de-esterification and degradation of pectic polysaccharides. Moreover, ultrastructural localization showed that both esterified and unesterified homogalacturonans (HGs) localize mainly in the AZ cell walls, including the middle lamella and tricellular junction zones. Our results indicate that unesterified HGs are likely to contribute to cell separation in the olive fruit AZ. Similarly, immunogold labeling demonstrated a decrease in both galactose-rich and arabinose-rich pectins in AZ cell walls during ripe fruit abscission. In addition, AGPs were localized in the cell wall, plasma membrane and cytoplasm of AZ cells with lower levels of AGPs during ripe fruit abscission. This detailed temporal profile of the cell wall polysaccharide composition, and the pectins and AGP immunolocalization in the olive fruit AZ, offers new insights into cell wall remodeling during ripe fruit abscission.
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Affiliation(s)
- Ruben Parra
- Department of Plant Physiology, Faculty of Science, University of Extremadura, Avda de Elvas s/n, 06006 Badajoz, Spain
| | - Miguel A Paredes
- Department of Plant Physiology, Faculty of Science, University of Extremadura, Avda de Elvas s/n, 06006 Badajoz, Spain
| | - Juana Labrador
- Department of Plant Physiology, Faculty of Science, University of Extremadura, Avda de Elvas s/n, 06006 Badajoz, Spain
| | - Cláudia Nunes
- Department of Chemistry, University of Aveiro, Aveiro P-3810-193, Portugal
| | - Manuel A Coimbra
- Department of Chemistry, University of Aveiro, Aveiro P-3810-193, Portugal
| | - Nieves Fernandez-Garcia
- Department of Abiotic Stress and Plant Pathology, Centro de Edafología y Biología Aplicada del Segura (CSIC), Murcia, Spain
| | - Enrique Olmos
- Department of Abiotic Stress and Plant Pathology, Centro de Edafología y Biología Aplicada del Segura (CSIC), Murcia, Spain
| | - Mercedes Gallardo
- Department of Plant Physiology, University of Vigo, Campus Lagoas-Marcosende, s/n, Vigo 36310, Spain
| | - Maria C Gomez-Jimenez
- Department of Plant Physiology, Faculty of Science, University of Extremadura, Avda de Elvas s/n, 06006 Badajoz, Spain
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10
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Identification and Characterization of HAESA-Like Genes Involved in the Fruitlet Abscission in Litchi. Int J Mol Sci 2019; 20:ijms20235945. [PMID: 31779183 PMCID: PMC6928639 DOI: 10.3390/ijms20235945] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/05/2019] [Accepted: 11/07/2019] [Indexed: 11/24/2022] Open
Abstract
Regulation of abscission is an important agricultural concern since precocious abscission can reduce crop yield. INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) peptide and its receptors the HAESA (HAE) and HAESA-like2 (HSL2) kinases have been revealed to be core components controlling floral organ abscission in the model plant Arabidopsis. However, it is still unclear whether the homologs of IDA-HAE/HSL2 in non-model plants are correlated to abscission. Previously, we found LcIDL1, a homolog of IDA from litchi, has a similar role to AtIDA in control of floral organ abscission in Arabidopsis. Here, we further isolated an HAESA-like homolog, LcHSL2, which is likely involved in the fruitlet abscission in litchi. Ectopic expression of LcHSL2 in wild type Arabidopsis has no effect on the floral organ abscission. However, its presence in the hae hsl2 mutant background completely rescued the floral organ abscission deficiency. LcHSL2 is localized in the cell membrane and the LcHSL2 gene is expressed at the pedicel abscission zone (AZ) of litchi and floral AZ of Arabidopsis. Real-time PCR analysis showed that the expression level of LcHSL2 was increased during ethephon-induced fruitlet abscission in litchi. Taken together, our findings suggest that HSL2 homologs have functional conservation in Arabidopsis and litchi, and LcHSL2 might play a critical role in regulation of fruitlet abscission in litchi.
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11
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Generoso Ferreira M, Madureira Barroso G, da Costa VAM, de Castro E Castro BM, Cola Zanuncio J, Marinho Pereira I, Ferreira EA, Teodoro Francino DM, Barbosa Dos Santos J. Development of native forest species of the Atlantic forest in soil contaminated with hormonal herbicides. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2019; 21:921-927. [PMID: 31179716 DOI: 10.1080/15226514.2019.1583636] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hormonal herbicides, used in pastures, can suffer drift and reach forests. The sensitivity and potential phytoremediation of native species to herbicide residues should be evaluated. The objective of this study is to evaluate the initial development of native Atlantic Forest tree species in soil contaminated with hormonal herbicides. The experiment was conducted in a greenhouse in a 4 x 8 factorial scheme. The first factor had the control and the herbicide Tordon® in three doses (0.166, 0.333 and 0.666 L ha-1) and the second consisted of the forest species Anadenanthera colubrina (Vell.), Cassia ferruginea (Schrad.) Schrad. ex DC., Dalbergia villosa (Benth.) Benth., Machaerium nyctitans (Vell.) Benth., Machaerium opacum Vogel, Piptadenia gonoacantha (Mart.) JF Macbr., Senegalia polyphylla (DC.) Britton and Rose, Senna macranthera (DC Collad.) HS Irwin and Barnaby. The emergence, height, survival, emergence speed index, intoxication, root volume, stem diameter, root and shoot dry mass, leaf area and leaf numbers of the forest species were evaluated. The A. colubrina, D. villosa and M. opacum initial development was reduced by the herbicides 2.4-D plus picloram residues. S. macranthera and P. gonoacantha are tolerant to this mixture and, therefore, show potential for phytoremediation of degraded areas containing residues of these compounds.
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Affiliation(s)
- Mariana Generoso Ferreira
- a Departamento de Engenharia Florestal , Universidade Federal dos Vales do Jequitinhonha e Mucuri , Minas Gerais , Brasil
| | - Gabriela Madureira Barroso
- a Departamento de Engenharia Florestal , Universidade Federal dos Vales do Jequitinhonha e Mucuri , Minas Gerais , Brasil
| | - Vitor Antunes M da Costa
- a Departamento de Engenharia Florestal , Universidade Federal dos Vales do Jequitinhonha e Mucuri , Minas Gerais , Brasil
| | | | - José Cola Zanuncio
- c Departamento de Entomologia/BIOAGRO , Universidade Federal de Viçosa , Minas Gerais , Brasil
| | - Israel Marinho Pereira
- a Departamento de Engenharia Florestal , Universidade Federal dos Vales do Jequitinhonha e Mucuri , Minas Gerais , Brasil
| | - Evander Alves Ferreira
- d Departamento de Agronomia , Universidade Federal dos Vales do Jequitinhonha e Mucuri , Minas Gerais , Brasil
| | - Dayana Maria Teodoro Francino
- e Departamento de Ciências Biológicas , Universidade Federal dos Vales do Jequitinhonha e Mucuri , Minas Gerais , Brasil
| | - José Barbosa Dos Santos
- d Departamento de Agronomia , Universidade Federal dos Vales do Jequitinhonha e Mucuri , Minas Gerais , Brasil
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12
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Kim J, Chun JP, Tucker ML. Transcriptional Regulation of Abscission Zones. PLANTS 2019; 8:plants8060154. [PMID: 31174352 PMCID: PMC6631628 DOI: 10.3390/plants8060154] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 05/29/2019] [Accepted: 06/04/2019] [Indexed: 12/17/2022]
Abstract
Precise and timely regulation of organ separation from the parent plant (abscission) is consequential to improvement of crop productivity as it influences both the timing of harvest and fruit quality. Abscission is tightly associated with plant fitness as unwanted organs (petals, sepals, filaments) are shed after fertilization while seeds, fruits, and leaves are cast off as means of reproductive success or in response to abiotic/biotic stresses. Floral organ abscission in Arabidopsis has been a useful model to elucidate the molecular mechanisms that underlie the separation processes, and multiple abscission signals associated with the activation and downstream pathways have been uncovered. Concomitantly, large-scale analyses of omics studies in diverse abscission systems of various plants have added valuable insights into the abscission process. The results suggest that there are common molecular events linked to the biosynthesis of a new extracellular matrix as well as cell wall disassembly. Comparative analysis between Arabidopsis and soybean abscission systems has revealed shared and yet disparate regulatory modules that affect the separation processes. In this review, we discuss our current understanding of the transcriptional regulation of abscission in several different plants that has improved on the previously proposed four-phased model of organ separation.
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Affiliation(s)
- Joonyup Kim
- Department of Horticultural Science, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea.
| | - Jong-Pil Chun
- Department of Horticultural Science, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea.
| | - Mark L Tucker
- Soybean Genomics and Improvement Laboratory, Agricultural Research Service, USDA Bldg. 006, 10300 Baltimore Ave., Beltsville, MD 20705, USA.
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13
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Rau D, Murgia ML, Rodriguez M, Bitocchi E, Bellucci E, Fois D, Albani D, Nanni L, Gioia T, Santo D, Marcolungo L, Delledonne M, Attene G, Papa R. Genomic dissection of pod shattering in common bean: mutations at non-orthologous loci at the basis of convergent phenotypic evolution under domestication of leguminous species. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2019; 97:693-714. [PMID: 30422331 DOI: 10.1111/tpj.14155] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 10/14/2018] [Accepted: 10/30/2018] [Indexed: 05/05/2023]
Abstract
The complete or partial loss of shattering ability occurred independently during the domestication of several crops. Therefore, the study of this trait can provide an understanding of the link between phenotypic and molecular convergent evolution. The genetic dissection of 'pod shattering' in Phaseolus vulgaris is achieved here using a population of introgression lines and next-generation sequencing techniques. The 'occurrence' of the indehiscent phenotype (indehiscent versus dehiscent) depends on a major locus on chromosome 5. Furthermore, at least two additional genes are associated with the 'level' of shattering (number of shattering pods per plant: low versus high) and the 'mode' of shattering (non-twisting versus twisting pods), with all of these loci contributing to the phenotype by epistatic interactions. Comparative mapping indicates that the major gene identified on common bean chromosome 5 corresponds to one of the four quantitative trait loci for pod shattering in Vigna unguiculata. None of the loci identified comprised genes that are homologs of the known shattering genes in Glycine max. Therefore, although convergent domestication can be determined by mutations at orthologous loci, this was only partially true for P. vulgaris and V. unguiculata, which are two phylogenetically closely related crop species, and this was not the case for the more distant P. vulgaris and G. max. Conversely, comparative mapping suggests that the convergent evolution of the indehiscent phenotype arose through mutations in different genes from the same underlying gene networks that are involved in secondary cell-wall biosynthesis and lignin deposition patterning at the pod level.
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Affiliation(s)
- Domenico Rau
- Dipartimento di Agraria, Università degli Studi di Sassari, Via E. De Nicola, 07100, Sassari, Italy
| | - Maria L Murgia
- Dipartimento di Agraria, Università degli Studi di Sassari, Via E. De Nicola, 07100, Sassari, Italy
| | - Monica Rodriguez
- Dipartimento di Agraria, Università degli Studi di Sassari, Via E. De Nicola, 07100, Sassari, Italy
| | - Elena Bitocchi
- Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università Politecnica delle Marche, via Brecce Bianche, 60131, Ancona, Italy
| | - Elisa Bellucci
- Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università Politecnica delle Marche, via Brecce Bianche, 60131, Ancona, Italy
| | - Davide Fois
- Dipartimento di Agraria, Università degli Studi di Sassari, Via E. De Nicola, 07100, Sassari, Italy
| | - Diego Albani
- Dipartimento di Agraria, Università degli Studi di Sassari, Via E. De Nicola, 07100, Sassari, Italy
| | - Laura Nanni
- Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università Politecnica delle Marche, via Brecce Bianche, 60131, Ancona, Italy
| | - Tania Gioia
- Scuola di Scienze Agrarie, Forestali, Alimentari e Ambientali, Università degli Studi della Basilicata, viale dell'Ateneo Lucano 10, 85100, Potenza, Italy
| | - Debora Santo
- Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università Politecnica delle Marche, via Brecce Bianche, 60131, Ancona, Italy
| | - Luca Marcolungo
- Dipartimento di Biotecnologie, Università degli Studi di Verona, Cà Vignal 1, Strada Le Grazie 15, 37134, Verona, Italy
| | - Massimo Delledonne
- Dipartimento di Biotecnologie, Università degli Studi di Verona, Cà Vignal 1, Strada Le Grazie 15, 37134, Verona, Italy
| | - Giovanna Attene
- Dipartimento di Agraria, Università degli Studi di Sassari, Via E. De Nicola, 07100, Sassari, Italy
| | - Roberto Papa
- Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università Politecnica delle Marche, via Brecce Bianche, 60131, Ancona, Italy
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14
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Taylor I, Walker JC. Transcriptomic evidence for distinct mechanisms underlying abscission deficiency in the Arabidopsis mutants haesa/haesa-like 2 and nevershed. BMC Res Notes 2018; 11:754. [PMID: 30352616 PMCID: PMC6199728 DOI: 10.1186/s13104-018-3864-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 10/17/2018] [Indexed: 12/19/2022] Open
Abstract
Objective In Arabidopsis, the abscission of floral organs is regulated by two related receptor-like protein kinases, HAESA and HAESA–like 2 (HAE/HSL2). Signaling by HAE/HSL2 leads to expression of genes encoding secreted cell wall remodeling and hydrolase enzymes. hae hsl2 mutants fail to induce expression of these genes and retain floral organs indefinitely. Mutants in the gene NEVERSHED (NEV) also fail to abscise floral organs and phenotypically resemble hae hsl2. NEV encodes an ADP-ribosylation factor GTPase-activating protein that localizes to the trans-Golgi network and early endosome. nev displays altered Golgi morphology and aberrations in vesicular trafficking. The mechanism by which nev fails to abscise is presently unknown. It has been hypothesized that nev fails to activate HAE/HSL2 signaling. In this study we use RNA-Sequencing to test this hypothesis. Results We show that the transcriptional alterations in hae hsl2 and nev are highly divergent. hae hsl2 displays a clear reduction in expression of genes associated with cell wall remodeling and pectin degradation, while nev displays vast transcriptional changes associated with response to pathogens. These results suggest that the mechanism of the defect between hae hsl2 and nev are distinct. Electronic supplementary material The online version of this article (10.1186/s13104-018-3864-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Isaiah Taylor
- Division of Biological Sciences, University of Missouri, Columbia, MO, 65211, USA.,Interdisciplinary Plant Group, University of Missouri, Columbia, MO, 65211, USA.,Department of Statistics, University of Missouri, Columbia, MO, 65211, USA.,Department of Biology and Howard Hughes Medical Institute, Duke University, Durham, NC, 27708, USA
| | - John C Walker
- Division of Biological Sciences, University of Missouri, Columbia, MO, 65211, USA. .,Interdisciplinary Plant Group, University of Missouri, Columbia, MO, 65211, USA.
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15
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Abstract
Abscission is a process in plants for shedding unwanted organs such as leaves, flowers, fruits, or floral organs. Shedding of leaves in the fall is the most visually obvious display of abscission in nature. The very shape plants take is forged by the processes of growth and abscission. Mankind manipulates abscission in modern agriculture to do things such as prevent pre-harvest fruit drop prior to mechanical harvesting in orchards. Abscission occurs specifically at abscission zones that are laid down as the organ that will one day abscise is developed. A sophisticated signaling network initiates abscission when it is time to shed the unwanted organ. In this article, we review recent advances in understanding the signaling mechanisms that activate abscission. Physiological advances and roles for hormones in abscission are also addressed. Finally, we discuss current avenues for basic abscission research and potentially lucrative future directions for its application to modern agriculture.
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Affiliation(s)
- O Rahul Patharkar
- Division of Biological Sciences and Interdisciplinary Plant Group, University of Missouri, Columbia, MO, USA
| | - John C Walker
- Division of Biological Sciences and Interdisciplinary Plant Group, University of Missouri, Columbia, MO, USA
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16
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Abstract
Receptor kinases play a central role in various biological processes, but due to their low abundance and highly hydrophobic and dynamic nature, only a few of them have been functionally characterized, and their partners and ligands remain unidentified. Receptor protein extraction and purification from plant tissues is one of the most challenging steps for the success of various biochemical analyses to characterize their function. Immunoprecipitation is a widely used and selective method for enriching or purifying a specific protein. Here we describe two different optimized protein purification protocols, batch and on-chip immunoprecipitation, which efficiently isolate plant membrane receptor kinases for functional analysis.
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Affiliation(s)
- Jin Suk Lee
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC, Canada, H4B 1R6.
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17
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Receptor kinase complex transmits RALF peptide signal to inhibit root growth in Arabidopsis. Proc Natl Acad Sci U S A 2016; 113:E8326-E8334. [PMID: 27930296 DOI: 10.1073/pnas.1609626113] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
A number of hormones work together to control plant cell growth. Rapid Alkalinization Factor 1 (RALF1), a plant-derived small regulatory peptide, inhibits cell elongation through suppression of rhizosphere acidification in plants. Although a receptor-like kinase, FERONIA (FER), has been shown to act as a receptor for RALF1, the signaling mechanism remains unknown. In this study, we identified a receptor-like cytoplasmic kinase (RPM1-induced protein kinase, RIPK), a plasma membrane-associated member of the RLCK-VII subfamily, that is recruited to the receptor complex through interacting with FER in response to RALF1. RALF1 triggers the phosphorylation of both FER and RIPK in a mutually dependent manner. Genetic analysis of the fer-4 and ripk mutants reveals RIPK, as well as FER, to be required for RALF1 response in roots. The RALF1-FER-RIPK interactions may thus represent a mechanism for peptide signaling in plants.
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18
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Baer J, Taylor I, Walker JC. Disrupting ER-associated protein degradation suppresses the abscission defect of a weak hae hsl2 mutant in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:5473-5484. [PMID: 27566817 PMCID: PMC5049395 DOI: 10.1093/jxb/erw313] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In Arabidopsis thaliana, the process of abscission, or the shedding of unwanted organs, is mediated by two genes, HAESA (HAE) and HAESA-LIKE 2 (HSL2), encoding receptor-like protein kinases (RLKs). The double loss-of-function mutant hae-3 hsl2-3 is completely deficient in floral abscission, but, interestingly, the hae-3 hsl2-9 mutant displays a less severe defect. This mutant was chosen for an ethyl methanesulfonate (EMS) screen to isolate enhancer and suppressor mutants, and two such suppressors are the focus of this study. Pooled DNA from the F2 generation of a parental backcross was analyzed by genome sequencing to reveal candidate genes, two of which complement the suppressor phenotype. These genes, EMS-MUTAGENIZED BRI1 SUPPRESSOR 3 (EBS3) and EBS4, both encode mannosyltransferases involved in endoplasmic reticulum (ER)-associated degradation (ERAD) of proteins. Further analysis of these suppressor lines revealed that suppressor mutations are acting solely on the partially functional hsl2-9 mutant receptor to modify the abscission phenotype. Expressing a hsl2-9-yellow fluorescent protein (YFP) transgene in ebs3 mutants yields a higher fluorescent signal than in EBS3/ebs3, suggesting that these mutants restore abscission by disrupting ERAD to allow accumulation of the hsl2-9 receptor, which probably escapes degradation to be trafficked to the plasma membrane to regain signaling.
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Affiliation(s)
- John Baer
- Division of Biological Science, University of Missouri, Columbia, MO 65211, USA Interdisciplinary Plant Group, University of Missouri, Columbia, MO 65211, USA
| | - Isaiah Taylor
- Division of Biological Science, University of Missouri, Columbia, MO 65211, USA Interdisciplinary Plant Group, University of Missouri, Columbia, MO 65211, USA
| | - John C Walker
- Division of Biological Science, University of Missouri, Columbia, MO 65211, USA Interdisciplinary Plant Group, University of Missouri, Columbia, MO 65211, USA
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19
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Patharkar OR, Macken TA, Walker JC. Serine 231 and 257 of Agamous-like 15 are phosphorylated in floral receptacles. PLANT SIGNALING & BEHAVIOR 2016; 11:e1199314. [PMID: 27322882 PMCID: PMC4991328 DOI: 10.1080/15592324.2016.1199314] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 05/31/2016] [Accepted: 06/03/2016] [Indexed: 05/23/2023]
Abstract
The large dynamic range of gene expression changes accompanying floral organ abscission can be explained by a molecular positive feedback loop that regulates the process. In short, a mitogen-activated protein kinase (MAPK) cascade, positioned genetically downstream from the abscission receptor HAESA (HAE), phosphorylates the transcription factor, AGAMOUS-like 15 (AGL15), allowing HAE to be expressed. However, it is unknown which residues of AGL15 are phosphorylated and precisely how phosphorylation alters AGL15 function. Here we report that serine 231 and 257 of AGL15 are phosphorylated in floral receptacles. Effects of phosphorylation on AGL15 are discussed.
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Affiliation(s)
- Osric Rahul Patharkar
- Division of Biological Sciences and Interdisciplinary Plant Group, University of Missouri, Columbia, MO, USA
| | - Terra A. Macken
- Division of Biological Sciences and Interdisciplinary Plant Group, University of Missouri, Columbia, MO, USA
| | - John C. Walker
- Division of Biological Sciences and Interdisciplinary Plant Group, University of Missouri, Columbia, MO, USA
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20
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Sharma A, Sahu S, Kumari P, Gopi SR, Malhotra R, Biswas S. Genome-wide identification and functional annotation of miRNAs in anti-inflammatory plant and their cross-kingdom regulation in Homo sapiens. J Biomol Struct Dyn 2016; 35:1389-1400. [DOI: 10.1080/07391102.2016.1185381] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Ankita Sharma
- Department of Genomics and Molecular Medicine, Institute of Genomics and Integrative Biology, Delhi, India
| | - Sarika Sahu
- School of Biotechnology, Shobhit University, Meerut, Uttar Pradesh, India
| | - Pooja Kumari
- Department of Genomics and Molecular Medicine, Institute of Genomics and Integrative Biology, Delhi, India
| | - Soundhara Rajan Gopi
- Department of Genomics and Molecular Medicine, Institute of Genomics and Integrative Biology, Delhi, India
| | - Rajesh Malhotra
- Department of Orthopaedics, All India Institute of Medical Science, New Delhi, India
| | - Sagarika Biswas
- Department of Genomics and Molecular Medicine, Institute of Genomics and Integrative Biology, Delhi, India
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21
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Hodge JG, Kellogg EA. Abscission zone development in Setaria viridis and its domesticated relative, Setaria italica. AMERICAN JOURNAL OF BOTANY 2016; 103:998-1005. [PMID: 27257006 DOI: 10.3732/ajb.1500499] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 04/27/2016] [Indexed: 05/26/2023]
Abstract
PREMISE OF THE STUDY Development of an abscission zone (AZ) is needed for dispersal of seeds, and AZ loss was a critical early step in plant domestication. The AZ forms in different tissues in different species of plants, but whether the AZ is developmentally similar wherever it occurs is unknown. AZ development in Setaria viridis was studied as a representative of the previously uncharacterized subfamily Panicoideae. METHODS One accession of the wild species S. viridis and two of its domesticate, S. italica, were studied. Strength of the AZ was measured with a force gauge. Anatomy of the AZ was studied throughout development using bright field and confocal microscopy. KEY RESULTS The force required to remove a spikelet of S. viridis from the parent plant dropped steadily during development, whereas that required to remove spikelets of S. italica increased initially before stabilizing at a high level. Despite the clear difference in tensile strength of the AZ, anatomical differences between S. viridis and S. italica were subtle, and the position of the AZ was not easy to determine in cross sections of pedicel apices. Staining with DAPI showed that nuclei were present up to and presumably through abscission in S. viridis, and acridine orange staining showed much less lignification than in other cereals. CONCLUSIONS The AZ in Setaria is developmentally and anatomically different from that characterized in rice, barley, and many eudicots. In particular, no set of small, densely cytoplasmic cells is obvious. This difference in anatomy could point to differential genetic control of the structure.
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Affiliation(s)
- John G Hodge
- University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, USA Donald Danforth Plant Science Center, 975 North Warson Road, St. Louis, Missouri 63132 USA
| | - Elizabeth A Kellogg
- Donald Danforth Plant Science Center, 975 North Warson Road, St. Louis, Missouri 63132 USA
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22
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Santiago J, Brandt B, Wildhagen M, Hohmann U, Hothorn LA, Butenko MA, Hothorn M. Mechanistic insight into a peptide hormone signaling complex mediating floral organ abscission. eLife 2016; 5:e15075. [PMID: 27058169 DOI: 10.7554/elife.15075.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 04/07/2016] [Indexed: 05/28/2023] Open
Abstract
Plants constantly renew during their life cycle and thus require to shed senescent and damaged organs. Floral abscission is controlled by the leucine-rich repeat receptor kinase (LRR-RK) HAESA and the peptide hormone IDA. It is unknown how expression of IDA in the abscission zone leads to HAESA activation. Here we show that IDA is sensed directly by the HAESA ectodomain. Crystal structures of HAESA in complex with IDA reveal a hormone binding pocket that accommodates an active dodecamer peptide. A central hydroxyproline residue anchors IDA to the receptor. The HAESA co-receptor SERK1, a positive regulator of the floral abscission pathway, allows for high-affinity sensing of the peptide hormone by binding to an Arg-His-Asn motif in IDA. This sequence pattern is conserved among diverse plant peptides, suggesting that plant peptide hormone receptors may share a common ligand binding mode and activation mechanism.
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Affiliation(s)
- Julia Santiago
- Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland
| | - Benjamin Brandt
- Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland
| | - Mari Wildhagen
- Department of Biosciences, Section for Genetic and Evolutionary Biology, University of Oslo, Oslo, Norway
| | - Ulrich Hohmann
- Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland
| | - Ludwig A Hothorn
- Institute of Biostatistics, Leibniz University, Hannover, Germany
| | - Melinka A Butenko
- Department of Biosciences, Section for Genetic and Evolutionary Biology, University of Oslo, Oslo, Norway
| | - Michael Hothorn
- Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland
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23
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Santiago J, Brandt B, Wildhagen M, Hohmann U, Hothorn LA, Butenko MA, Hothorn M. Mechanistic insight into a peptide hormone signaling complex mediating floral organ abscission. eLife 2016; 5. [PMID: 27058169 PMCID: PMC4848090 DOI: 10.7554/elife.15075] [Citation(s) in RCA: 140] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 04/07/2016] [Indexed: 01/26/2023] Open
Abstract
Plants constantly renew during their life cycle and thus require to shed senescent and damaged organs. Floral abscission is controlled by the leucine-rich repeat receptor kinase (LRR-RK) HAESA and the peptide hormone IDA. It is unknown how expression of IDA in the abscission zone leads to HAESA activation. Here we show that IDA is sensed directly by the HAESA ectodomain. Crystal structures of HAESA in complex with IDA reveal a hormone binding pocket that accommodates an active dodecamer peptide. A central hydroxyproline residue anchors IDA to the receptor. The HAESA co-receptor SERK1, a positive regulator of the floral abscission pathway, allows for high-affinity sensing of the peptide hormone by binding to an Arg-His-Asn motif in IDA. This sequence pattern is conserved among diverse plant peptides, suggesting that plant peptide hormone receptors may share a common ligand binding mode and activation mechanism. DOI:http://dx.doi.org/10.7554/eLife.15075.001 Plants can shed their leaves, flowers or other organs when they no longer need them. But how does a leaf or a flower know when to let go? A receptor protein called HAESA is found on the surface of the cells that surround a future break point on the plant. When its time to shed an organ, a hormone called IDA instructs HAESA to trigger the shedding process. However, the molecular details of how IDA triggers organ shedding are not clear. The shedding of floral organs (or leaves) can be easily studied in a model plant called Arabidopsis. Santiago et al. used protein biochemistry, structural biology and genetics to uncover how the IDA hormone activates HAESA. The experiments show that IDA binds directly to a canyon shaped pocket in HAESA that extends out from the surface of the cell. IDA binding to HAESA allows another receptor protein called SERK1 to bind to HAESA, which results in the release of signals inside the cell that trigger the shedding of organs. The next step following on from this work is to understand what signals are produced when IDA activates HAESA. Another challenge will be to find out where IDA is produced in the plant and what causes it to accumulate in specific places in preparation for organ shedding. DOI:http://dx.doi.org/10.7554/eLife.15075.002
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Affiliation(s)
- Julia Santiago
- Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland
| | - Benjamin Brandt
- Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland
| | - Mari Wildhagen
- Department of Biosciences, Section for Genetic and Evolutionary Biology, University of Oslo, Oslo, Norway
| | - Ulrich Hohmann
- Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland
| | - Ludwig A Hothorn
- Institute of Biostatistics, Leibniz University, Hannover, Germany
| | - Melinka A Butenko
- Department of Biosciences, Section for Genetic and Evolutionary Biology, University of Oslo, Oslo, Norway
| | - Michael Hothorn
- Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland
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Meng X, Zhou J, Tang J, Li B, de Oliveira MVV, Chai J, He P, Shan L. Ligand-Induced Receptor-like Kinase Complex Regulates Floral Organ Abscission in Arabidopsis. Cell Rep 2016; 14:1330-1338. [PMID: 26854226 DOI: 10.1016/j.celrep.2016.01.023] [Citation(s) in RCA: 121] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 11/30/2015] [Accepted: 01/04/2016] [Indexed: 01/09/2023] Open
Abstract
Abscission is a developmental process that enables plants to shed unwanted organs. In Arabidopsis, the floral organ abscission is regulated by a signaling pathway consisting of the peptide ligand IDA, the receptor-like kinases (RLKs) HAE and HSL2, and a downstream MAP kinase (MAPK) cascade. However, little is known about the molecular link between ligand-receptor pairs and intracellular signaling. Here, we report that the SERK family RLKs function redundantly in regulating floral organ abscission downstream of IDA and upstream of the MAPK cascade. IDA induces heterodimerization of HAE/HSL2 and SERKs, which transphosphorylate each other. The SERK3 residues mediating its interaction with the immune receptor FLS2 and the brassinosteroid receptor BRI1 are also required for IDA-induced HAE/HSL2-SERK3 interaction, suggesting SERKs serve as co-receptors of HAE/HSL2 in perceiving IDA. Thus, our study reveals the signaling activation mechanism in floral organ abscission by IDA-induced HAE/HSL2-SERK complex formation accompanied by transphosphorylation.
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Affiliation(s)
- Xiangzong Meng
- Department of Biochemistry and Biophysics, Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, TX 77843, USA
| | - Jinggeng Zhou
- Department of Biochemistry and Biophysics, Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, TX 77843, USA
| | - Jiao Tang
- Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Bo Li
- Department of Plant Pathology and Microbiology, Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, TX 77843, USA
| | - Marcos V V de Oliveira
- Department of Biochemistry and Biophysics, Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, TX 77843, USA
| | - Jijie Chai
- Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Ping He
- Department of Biochemistry and Biophysics, Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, TX 77843, USA
| | - Libo Shan
- Department of Plant Pathology and Microbiology, Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, TX 77843, USA.
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25
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Patterson SE, Bolivar-Medina JL, Falbel TG, Hedtcke JL, Nevarez-McBride D, Maule AF, Zalapa JE. Are We on the Right Track: Can Our Understanding of Abscission in Model Systems Promote or Derail Making Improvements in Less Studied Crops? FRONTIERS IN PLANT SCIENCE 2016; 6:1268. [PMID: 26858730 PMCID: PMC4726918 DOI: 10.3389/fpls.2015.01268] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 12/28/2015] [Indexed: 05/24/2023]
Abstract
As the world population grows and resources and climate conditions change, crop improvement continues to be one of the most important challenges for agriculturalists. The yield and quality of many crops is affected by abscission or shattering, and environmental stresses often hasten or alter the abscission process. Understanding this process can not only lead to genetic improvement, but also changes in cultural practices and management that will contribute to higher yields, improved quality and greater sustainability. As plant scientists, we have learned significant amounts about this process through the study of model plants such as Arabidopsis, tomato, rice, and maize. While these model systems have provided significant valuable information, we are sometimes challenged to use this knowledge effectively as variables including the economic value of the crop, the uniformity of the crop, ploidy levels, flowering and crossing mechanisms, ethylene responses, cultural requirements, responses to changes in environment, and cellular and tissue specific morphological differences can significantly influence outcomes. The value of genomic resources for lesser-studied crops such as cranberries and grapes and the orphan crop fonio will also be considered.
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Affiliation(s)
- Sara E. Patterson
- Department of Horticulture, University of Wisconsin–MadisonMadison, WI, USA
| | - Jenny L. Bolivar-Medina
- Department of Horticulture, University of Wisconsin–MadisonMadison, WI, USA
- Vegetable Crops Research Unit, United States Department of Agriculture – Agricultural Research ServiceMadison, WI, USA
| | - Tanya G. Falbel
- Department of Horticulture, University of Wisconsin–MadisonMadison, WI, USA
| | | | | | - Andrew F. Maule
- Department of Horticulture, University of Wisconsin–MadisonMadison, WI, USA
| | - Juan E. Zalapa
- Department of Horticulture, University of Wisconsin–MadisonMadison, WI, USA
- Vegetable Crops Research Unit, United States Department of Agriculture – Agricultural Research ServiceMadison, WI, USA
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Taylor I, Wang Y, Seitz K, Baer J, Bennewitz S, Mooney BP, Walker JC. Analysis of Phosphorylation of the Receptor-Like Protein Kinase HAESA during Arabidopsis Floral Abscission. PLoS One 2016; 11:e0147203. [PMID: 26784444 PMCID: PMC4718614 DOI: 10.1371/journal.pone.0147203] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 12/30/2015] [Indexed: 11/29/2022] Open
Abstract
Receptor-like protein kinases (RLKs) are the largest family of plant transmembrane signaling proteins. Here we present functional analysis of HAESA, an RLK that regulates floral organ abscission in Arabidopsis. Through in vitro and in vivo analysis of HAE phosphorylation, we provide evidence that a conserved phosphorylation site on a region of the HAE protein kinase domain known as the activation segment positively regulates HAE activity. Additional analysis has identified another putative activation segment phosphorylation site common to multiple RLKs that potentially modulates HAE activity. Comparative analysis suggests that phosphorylation of this second activation segment residue is an RLK specific adaptation that may regulate protein kinase activity and substrate specificity. A growing number of RLKs have been shown to exhibit biologically relevant dual specificity toward serine/threonine and tyrosine residues, but the mechanisms underlying dual specificity of RLKs are not well understood. We show that a phospho-mimetic mutant of both HAE activation segment residues exhibits enhanced tyrosine auto-phosphorylation in vitro, indicating phosphorylation of this residue may contribute to dual specificity of HAE. These results add to an emerging framework for understanding the mechanisms and evolution of regulation of RLK activity and substrate specificity.
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Affiliation(s)
- Isaiah Taylor
- Division of Biological Science, University of Missouri, Columbia, Missouri, United States of America
- Interdisciplinary Plant Group, University of Missouri, Columbia, Missouri, United States of America
| | - Ying Wang
- Division of Biological Science, University of Missouri, Columbia, Missouri, United States of America
- Interdisciplinary Plant Group, University of Missouri, Columbia, Missouri, United States of America
| | - Kati Seitz
- Division of Biological Science, University of Missouri, Columbia, Missouri, United States of America
- Interdisciplinary Plant Group, University of Missouri, Columbia, Missouri, United States of America
| | - John Baer
- Division of Biological Science, University of Missouri, Columbia, Missouri, United States of America
- Interdisciplinary Plant Group, University of Missouri, Columbia, Missouri, United States of America
| | - Stefan Bennewitz
- Division of Biological Science, University of Missouri, Columbia, Missouri, United States of America
- Interdisciplinary Plant Group, University of Missouri, Columbia, Missouri, United States of America
| | - Brian P. Mooney
- Interdisciplinary Plant Group, University of Missouri, Columbia, Missouri, United States of America
- Charles W. Gehrke Proteomics Center and Division of Biochemistry, Bond Life Sciences Center, University of Missouri, Columbia, Missouri, United States of America
| | - John C. Walker
- Division of Biological Science, University of Missouri, Columbia, Missouri, United States of America
- Interdisciplinary Plant Group, University of Missouri, Columbia, Missouri, United States of America
- * E-mail:
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Wang GQ, Wei PC, Tan F, Yu M, Zhang XY, Chen QJ, Wang XC. The Transcription Factor AtDOF4.7 Is Involved in Ethylene- and IDA-Mediated Organ Abscission in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2016; 7:863. [PMID: 27379143 PMCID: PMC4911407 DOI: 10.3389/fpls.2016.00863] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Accepted: 06/01/2016] [Indexed: 05/20/2023]
Abstract
Organ abscission is an important plant developmental process that occurs in response to environmental stress or pathogens. In Arabidopsis, ligand signals, such as ethylene or INFLORESCENCE DEFICIENT IN ABSCISSION (IDA), can regulate organ abscission. Previously, we reported that overexpression of AtDOF4.7, a transcription factor gene, directly suppresses the expression of the abscission-related gene ARABIDOPSIS DEHISCENCE ZONE POLYGALACTURONASE 2 (ADPG2), resulting in a deficiency of floral organ abscission. However, the relationship between AtDOF4.7 and abscission pathways still needs to be investigated. In this study, we showed that ethylene regulates the expression of AtDOF4.7, and the peptide ligand, IDA negatively regulates AtDOF4.7 at the transcriptional level. Genetic evidence indicates that AtDOF4.7 and IDA are involved in a common pathway, and a MAPK cascade can phosphorylate AtDOF4.7 in vitro. Further in vivo data suggest that AtDOF4.7 protein levels may be regulated by this phosphorylation. Collectively, our results indicate that ethylene regulates AtDOF4.7 that is involved in the IDA-mediated floral organ abscission pathway.
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Affiliation(s)
- Gao-Qi Wang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural UniversityBeijing, China
| | - Peng-Cheng Wei
- Rice Research Institution, AnHui Academy of Agricultural SciencesHefei, China
| | - Feng Tan
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural UniversityBeijing, China
| | - Man Yu
- Department of Food and Biological Technology, College of Food Science and Nutritional Engineering, China Agricultural UniversityBeijing, China
| | - Xiao-Yan Zhang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural UniversityBeijing, China
| | - Qi-Jun Chen
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural UniversityBeijing, China
| | - Xue-Chen Wang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural UniversityBeijing, China
- *Correspondence: Xue-Chen Wang,
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28
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Couzigou JM, Magne K, Mondy S, Cosson V, Clements J, Ratet P. The legume NOOT-BOP-COCH-LIKE genes are conserved regulators of abscission, a major agronomical trait in cultivated crops. THE NEW PHYTOLOGIST 2016; 209:228-40. [PMID: 26390061 DOI: 10.1111/nph.13634] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 08/04/2015] [Indexed: 05/05/2023]
Abstract
Plants are able to lose organs selectively through a process called abscission. This process relies on the differentiation of specialized territories at the junction between organs and the plant body that are called abscission zones (AZ). Several genes control the formation or functioning of these AZ. We have characterized BLADE-ON-PETIOLE (BOP) orthologues from several legume plants and studied their roles in the abscission process using a mutant approach. Here, we show that the Medicago truncatula NODULE ROOT (NOOT), the Pisum sativum COCHLEATA (COCH) and their orthologue in Lotus japonicus are strictly necessary for the abscission of not only petals, but also leaflets, leaves and fruits. We also showed that the expression pattern of the M. truncatula pNOOT::GUS fusion is associated with functional and vestigial AZs when expressed in Arabidopsis. In addition, we show that the stip mutant from Lupinus angustifolius, defective in stipule formation and leaf abscission, is mutated in a BOP orthologue. In conclusion, this study shows that this clade of proteins plays an important conserved role in promoting abscission of all aerial organs studied so far.
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Affiliation(s)
- Jean-Malo Couzigou
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Diderot, Université Paris-Saclay, Bâtiment 630, 91405, Orsay, France
- Laboratoire de Recherche en Sciences Végétales, UMR5546, Université de Toulouse, CNRS, 31326, Castanet Tolosan, France
| | - Kevin Magne
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Diderot, Université Paris-Saclay, Bâtiment 630, 91405, Orsay, France
| | - Samuel Mondy
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Diderot, Université Paris-Saclay, Bâtiment 630, 91405, Orsay, France
| | - Viviane Cosson
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Diderot, Université Paris-Saclay, Bâtiment 630, 91405, Orsay, France
| | | | - Pascal Ratet
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Diderot, Université Paris-Saclay, Bâtiment 630, 91405, Orsay, France
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29
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Kim J, Yang J, Yang R, Sicher RC, Chang C, Tucker ML. Transcriptome Analysis of Soybean Leaf Abscission Identifies Transcriptional Regulators of Organ Polarity and Cell Fate. FRONTIERS IN PLANT SCIENCE 2016; 7:125. [PMID: 26925069 PMCID: PMC4756167 DOI: 10.3389/fpls.2016.00125] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 01/22/2016] [Indexed: 05/19/2023]
Abstract
Abscission, organ separation, is a developmental process that is modulated by endogenous and environmental factors. To better understand the molecular events underlying the progression of abscission in soybean, an agriculturally important legume, we performed RNA sequencing (RNA-seq) of RNA isolated from the leaf abscission zones (LAZ) and petioles (Non-AZ, NAZ) after treating stem/petiole explants with ethylene for 0, 12, 24, 48, and 72 h. As expected, expression of several families of cell wall modifying enzymes and many pathogenesis-related (PR) genes specifically increased in the LAZ as abscission progressed. Here, we focus on the 5,206 soybean genes we identified as encoding transcription factors (TFs). Of the 5,206 TFs, 1,088 were differentially up- or down-regulated more than eight-fold in the LAZ over time, and, within this group, 188 of the TFs were differentially regulated more than eight-fold in the LAZ relative to the NAZ. These 188 abscission-specific TFs include several TFs containing domains for homeobox, MYB, Zinc finger, bHLH, AP2, NAC, WRKY, YABBY, and auxin-related motifs. To discover the connectivity among the TFs and highlight developmental processes that support organ separation, the 188 abscission-specific TFs were then clustered based on a >four-fold up- or down-regulation in two consecutive time points (i.e., 0 and 12 h, 12 and 24 h, 24 and 48 h, or 48 and 72 h). By requiring a sustained change in expression over two consecutive time intervals and not just one or several time intervals, we could better tie changes in TFs to a particular process or phase of abscission. The greatest number of TFs clustered into the 0 and 12 h group. Transcriptional network analysis for these abscission-specific TFs indicated that most of these TFs are known as key determinants in the maintenance of organ polarity, lateral organ growth, and cell fate. The abscission-specific expression of these TFs prior to the onset of abscission and their functional properties as defined by studies in Arabidopsis indicate that these TFs are involved in defining the separation cells and initiation of separation within the AZ by balancing organ polarity, roles of plant hormones, and cell differentiation.
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Affiliation(s)
- Joonyup Kim
- Soybean Genomics and Improvement Laboratory, Agricultural Research Service, United States Department of AgricultureBeltsville, MD, USA
- Department of Cell Biology and Molecular Genetics, University of MarylandCollege Park, MD, USA
- *Correspondence: Joonyup Kim
| | - Jinyoung Yang
- Crop Systems and Global Change Laboratory, Agricultural Research Service, United States Department of AgricultureBeltsville, MD, USA
| | - Ronghui Yang
- Soybean Genomics and Improvement Laboratory, Agricultural Research Service, United States Department of AgricultureBeltsville, MD, USA
| | - Richard C. Sicher
- Crop Systems and Global Change Laboratory, Agricultural Research Service, United States Department of AgricultureBeltsville, MD, USA
| | - Caren Chang
- Department of Cell Biology and Molecular Genetics, University of MarylandCollege Park, MD, USA
| | - Mark L. Tucker
- Soybean Genomics and Improvement Laboratory, Agricultural Research Service, United States Department of AgricultureBeltsville, MD, USA
- Mark L. Tucker
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30
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Abstract
Abscission is the process by which plants shed unwanted organs, either as part of a natural developmental program or in response to environmental stimuli. Studies in Arabidopsis thaliana have elucidated a number of the genetic components that regulate abscission of floral organs, including a pair of related receptor-like protein kinases, HAESA and HAESA-like 2 (HAE/HSL2) that regulate a MAP kinase cascade that is required for abscission. HAE is transcriptionally up-regulated in the floral abscission zone just before cell separation. Here, we identify AGAMOUS-like 15 (AGL15; a MADS-domain transcription factor) as a putative regulator of HAE expression. Overexpression of AGL15 results in decreased expression of HAE as well as a delayed abscission phenotype. Chromatin immunoprecipitation experiments indicate that AGL15 binds the HAE promoter in floral receptacles. AGL15 is then differentially phosphorylated through development in floral receptacles in a MITOGEN-ACTIVATED PROTEIN KINASE KINASE 4/5-dependent manner. MAP kinase phosphorylation of AGL15 is necessary for full HAE expression, thus completing a positive feedback loop controlling HAE expression. Together, the network components in this positive feedback loop constitute an emergent property that regulates the large dynamic range of gene expression (27-fold increase in HAE) observed in flowers when the abscission program is initiated. This study helps define the mechanisms and regulatory networks involved in a receptor-mediated signaling pathway that controls floral organ abscission.
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31
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Lombardi L, Arrom L, Mariotti L, Battelli R, Picciarelli P, Kille P, Stead T, Munné-Bosch S, Rogers HJ. Auxin involvement in tepal senescence and abscission in Lilium: a tale of two lilies. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:945-56. [PMID: 25422499 PMCID: PMC4321550 DOI: 10.1093/jxb/eru451] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Petal wilting and/or abscission terminates the life of the flower. However, how wilting and abscission are coordinated is not fully understood. There is wide variation in the extent to which petals wilt before abscission, even between cultivars of the same species. For example, tepals of Lilium longiflorum wilt substantially, while those of the closely related Lilium longiflorum×Asiatic hybrid (L.A.) abscise turgid. Furthermore, close comparison of petal death in these two Lilium genotypes shows that there is a dramatic fall in fresh weight/dry weight accompanied by a sharp increase in ion leakage in late senescent L. longiflorum tepals, neither of which occur in Lilium L.A. Despite these differences, a putative abscission zone was identified in both lilies, but while the detachment force was reduced to zero in Lilium L.A., wilting of the fused tepals in L. longiflorum occurred before abscission was complete. Abscission is often negatively regulated by auxin, and the possible role of auxin in regulating tepal abscission relative to wilting was tested in the two lilies. There was a dramatic increase in auxin levels with senescence in L. longiflorum but not in Lilium L.A. Fifty auxin-related genes were expressed in early senescent L. longiflorum tepals including 12 ARF-related genes. In Arabidopsis, several ARF genes are involved in the regulation of abscission. Expression of a homologous transcript to Arabidopsis ARF7/19 was 8-fold higher during senescence in L. longiflorum compared with abscising Lilium L.A., suggesting a conserved role for auxin-regulated abscission in monocotyledonous ethylene-insensitive flowers.
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Affiliation(s)
- Lara Lombardi
- Department of Biology, University of Pisa, Via Ghini 5, 56126 Pisa, Italy
| | - Laia Arrom
- Department of Plant Biology, Faculty of Biology, University of Barcelona, Avinguda Diagonal, 645, 08028 Barcelona, Spain School of Biosciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
| | - Lorenzo Mariotti
- Department of Biology, University of Pisa, Via Ghini 5, 56126 Pisa, Italy
| | - Riccardo Battelli
- Department of Agriculture, Food and Environment, University of Pisa, Via Mariscoglio 34, 56124 Pisa, Italy
| | - Piero Picciarelli
- Department of Agriculture, Food and Environment, University of Pisa, Via Mariscoglio 34, 56124 Pisa, Italy
| | - Peter Kille
- School of Biosciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
| | - Tony Stead
- School of Biological Sciences, Royal Holloway, University of London, Egham Hill, Egham, Surrey TW20 0EX, UK
| | - Sergi Munné-Bosch
- Department of Plant Biology, Faculty of Biology, University of Barcelona, Avinguda Diagonal, 645, 08028 Barcelona, Spain
| | - Hilary J Rogers
- School of Biosciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
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32
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Hepworth SR, Pautot VA. Beyond the Divide: Boundaries for Patterning and Stem Cell Regulation in Plants. FRONTIERS IN PLANT SCIENCE 2015; 6:1052. [PMID: 26697027 PMCID: PMC4673312 DOI: 10.3389/fpls.2015.01052] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/12/2015] [Indexed: 05/04/2023]
Abstract
The initiation of plant lateral organs from the shoot apical meristem (SAM) is closely associated with the formation of specialized domains of restricted growth known as the boundaries. These zones are required in separating the meristem from the growing primordia or adjacent organs but play a much broader role in regulating stem cell activity and shoot patterning. Studies have revealed a network of genes and hormone pathways that establish and maintain boundaries between the SAM and leaves. Recruitment of these pathways is shown to underlie a variety of processes during the reproductive phase including axillary meristems production, flower patterning, fruit development, and organ abscission. This review summarizes the role of conserved gene modules in patterning boundaries throughout the life cycle.
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Affiliation(s)
- Shelley R. Hepworth
- Department of Biology, Institute of Biochemistry, Carleton University, OttawaON, Canada
- *Correspondence: Shelley R. Hepworth, ; Véronique A. Pautot,
| | - Véronique A. Pautot
- Institut Jean-Pierre Bourgin, Institut National de la Recherche Agronomique, AgroParisTech, CNRS, Université Paris-SaclayVersailles, France
- *Correspondence: Shelley R. Hepworth, ; Véronique A. Pautot,
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33
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Dwivedi KK, Roche DJ, Clemente TE, Ge Z, Carman JG. The OCL3 promoter from Sorghum bicolor directs gene expression to abscission and nutrient-transfer zones at the bases of floral organs. ANNALS OF BOTANY 2014; 114:489-98. [PMID: 25081518 PMCID: PMC4204675 DOI: 10.1093/aob/mcu148] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Accepted: 06/11/2014] [Indexed: 05/24/2023]
Abstract
BACKGROUND AND AIMS During seed fill in cereals, nutrients are symplasmically unloaded to vascular parenchyma in ovules, but thereafter nutrient transport is less certain. In Zea mays, two mechanisms of nutrient passage through the chalaza and nucellus have been hypothesized, apoplasmic and symplasmic. In a recent study, nutrients first passed non-selectively to the chalazal apoplasm and were then selectively absorbed by the nucellus before being released to the endosperm apoplasm. This study reports that the promoter of OUTER CELL LAYER3 (PSbOCL3) from Sorghum bicolor (sorghum) directs gene expression to chalazal cells where the apoplasmic barrier is thought to form. The aims were to elucidate PSbOCL3 expression patterns in sorghum and relate them to processes of nutrient pathway development in kernels and to recognized functions of the homeodomain-leucine zipper (HD-Zip) IV transcription factor family to which the promoter belongs. METHODS PSbOCL3 was cloned and transformed into sorghum as a promoter-GUS (β-glucuronidase) construct. Plant tissues from control and transformed plants were then stained for GUS, and kernels were cleared and characterized using differential interference contrast microscopy. KEY RESULTS A symplasmic disconnect between the chalaza and nucellus during seed fill is inferred by the combination of two phenomena: differentiation of a distinct nucellar epidermis adjacent to the chalaza, and lysis of GUS-stained chalazal cells immediately proximal to the nucellar epidermis. Compression of the GUS-stained chalazal cells during kernel maturation produced the kernel abscission zone (closing layer). CONCLUSIONS The results suggest that the HD-Zip IV transcription factor SbOCL3 regulates kernel nutrition and abscission. The latter is consistent with evidence that members of this transcription factor group regulate silique abscission and dehiscence in Arabidopsis thaliana. Collectively, the findings suggest that processes of floral organ abscission are conserved among angiosperms and may in some respects differ from processes of leaf abscission.
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Affiliation(s)
- Krishna K Dwivedi
- Caisson Laboratories, Inc., 1740 Research Park Way, North Logan, UT 84341, USA Crop Improvement Division, Indian Grassland and Fodder Research Institute, Jhansi (UP) 284003, India Plants, Soils and Climate Department, Utah State University, Logan, UT 84322-4820, USA
| | - Dominique J Roche
- Caisson Laboratories, Inc., 1740 Research Park Way, North Logan, UT 84341, USA PhytoGen Seed Co. LLC, Western Research Station, 850 Plymouth Avenue, Corcoran, CA 93212, USA
| | - Tom E Clemente
- Department of Agronomy and Horticulture, Center for Plant Science Innovation, University of Nebraska, Lincoln, NE 68588, USA
| | - Zhengxiang Ge
- Department of Agronomy and Horticulture, Center for Plant Science Innovation, University of Nebraska, Lincoln, NE 68588, USA
| | - John G Carman
- Caisson Laboratories, Inc., 1740 Research Park Way, North Logan, UT 84341, USA Plants, Soils and Climate Department, Utah State University, Logan, UT 84322-4820, USA
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Han Z, Sun Y, Chai J. Structural insight into the activation of plant receptor kinases. CURRENT OPINION IN PLANT BIOLOGY 2014; 20:55-63. [PMID: 24840292 DOI: 10.1016/j.pbi.2014.04.008] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2014] [Revised: 03/19/2014] [Accepted: 04/24/2014] [Indexed: 05/08/2023]
Abstract
Plant genomes encode a large family of membrane-localized receptor kinases (RKs) that play important roles in diverse biological processes by responding to a wide spectrum of external signals. RK proteins have a conserved tripartite structural organization with a divergent ectodomain (ECD), a transmembrane segment and a conserved intracellular kinase domain. Signal perception by RK-ECDs induces activation of intracellular kinase domains and consequently initiates downstream signaling. An atomic understanding of the mechanisms underlying ligand recognition by RKs and their subsequent activation would aid in engineering crop plants for agricultural practice. Recent structural studies not only reveal the basis for ligand recognition of a few RKs, but also suggest dimerization as a common way of their activation. We propose that dimerization, giving rise to apposition of two intracellular kinase domains, is a general activation mechanism of RKs.
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Affiliation(s)
- Zhifu Han
- School of Life Sciences, Tsinghua University, Beijing 100084, China; Tsinghua-Peking Center for Life Sciences, Beijing 100084, China
| | - Yadong Sun
- School of Life Sciences, Tsinghua University, Beijing 100084, China; Tsinghua-Peking Center for Life Sciences, Beijing 100084, China
| | - Jijie Chai
- School of Life Sciences, Tsinghua University, Beijing 100084, China; Tsinghua-Peking Center for Life Sciences, Beijing 100084, China.
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Gubert CM, Christy ME, Ward DL, Groner WD, Liljegren SJ. ASYMMETRIC LEAVES1 regulates abscission zone placement in Arabidopsis flowers. BMC PLANT BIOLOGY 2014; 14:195. [PMID: 25038814 PMCID: PMC4223632 DOI: 10.1186/s12870-014-0195-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 07/14/2014] [Indexed: 05/21/2023]
Abstract
BACKGROUND The sepals, petals and stamens of Arabidopsis flowers detach via abscission zones formed at their boundaries with the underlying receptacle. The ASYMMETRIC LEAVES1 (AS1) MYB transcription factor plays a critical role in setting boundaries between newly formed leaf primordia and the shoot meristem. By repressing expression of a set of KNOTTED1-LIKE HOMEODOMAIN (KNOX) genes from developing leaf primordia, AS1 and its partner ASYMMETRIC LEAVES2 allow the patterning and differentiation of leaves to proceed. Here we show a unique role for AS1 in establishing the positions of the sepal and petal abscission zones in Arabidopsis flowers. RESULTS In as1 mutant flowers, the sepal abscission zones are displaced into inverted V-shaped positions, leaving behind triangular stubs of tissue when the organs abscise. Movement of the petal abscission zones is also apparent. Abscission of the medial sepals is delayed in as1 flowers; loss of chlorophyll in the senescing sepals contrasts with proximal zones that remain green. AS1 has previously been shown to restrict expression of the KNOX gene, BREVIPEDICELLUS (BP), from the sepals. We show here that loss of BP activity in as1 flowers is sufficient to restore the positions of the sepal and petal abscission zones, the sepal-receptacle boundary of the medial sepals and the timing of their abscission. CONCLUSIONS Our results indicate that AS1 activity is critical for the proper placement of the floral organ abscission zones, and influences the timing of organ shedding.
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Affiliation(s)
| | - Megan E Christy
- Department of Biology, University of Mississippi, Oxford 38677, MS, USA
| | - Denise L Ward
- Department of Biology, University of Mississippi, Oxford 38677, MS, USA
| | - William D Groner
- Department of Biology, University of Mississippi, Oxford 38677, MS, USA
| | - Sarah J Liljegren
- Department of Biology, University of Mississippi, Oxford 38677, MS, USA
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Kim J. Four shades of detachment: regulation of floral organ abscission. PLANT SIGNALING & BEHAVIOR 2014; 9:e976154. [PMID: 25482787 PMCID: PMC4623469 DOI: 10.4161/15592324.2014.976154] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 08/15/2014] [Accepted: 08/15/2014] [Indexed: 05/19/2023]
Abstract
Abscission of floral organs from the main body of a plant is a dynamic process that is developmentally and environmentally regulated. In the past decade, genetic studies in Arabidopsis have identified key signaling components and revealed their interactions in the regulation of floral organ abscission. The phytohormones jasmonic acid (JA) and ethylene play critical roles in flower development and floral organ abscission. These hormones regulate the timing of floral organ abscission both independently and inter-dependently. Although significant progress has been made in understanding abscission signaling, there are still many unanswered questions. These include considering abscission in the context of reproductive development and interplay between hormones embedded in the developmental processes. This review summarizes recent advances in the identification of molecular components in Arabidopsis and discusses their relationship with reproductive development. The emerging roles of hormones in the regulation of floral organ abscission, particularly by JA and ethylene, are examined.
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Key Words
- AGL15, AGAMOUS-LIKE 15
- AOS/DDE2, ALLENE OXIDE SYNTHASE/DELAYED DEHISCENCE 2
- ARF-GAP, ADP-ribosylation factor-GTPase activating protein
- AZ, abscission zone
- BOP1/2, BLADE ON PETIOLE 1/2
- BTP/POZ, Broad-Complex, Tramtrack, and Bric-a-brac/Pox virus and Zinc finger
- CST, CAST AWAY RECEPTOR-LIKE KINASE
- CTR1, CONSTITUTIVE TRIPLE RESPONSE 1
- DAB4/ COI1, DELAYED ABSCISSION 4/CORONATINE INSENSITIVE 1
- DAD1, DEFECTIVE ANTHER DEHISCENCE 1
- DDE1/OPR3, DELAYED DEHISCENCE 1/OXOPHYTODIENOATE-REDUCTASE 3
- EVR, EVERSHED RECEPTOR-LIKE KINASE
- EXP, EXPANSIN
- FAD7/8/3, FATTY ACID DESATURASE 7/8/3
- FYF, FOREVER YOUNG FLOWER
- HAE/HSL2, HAESA/HAESA-LIKE 2
- IM, inflorescence meristem
- JA, jasmonic acid
- JAZ, JASMONATE-ZIM DOMAIN
- KNAT1, KNOTTED-LIKE FROM ARABIDOPSIS THALIANA 1
- LOX3/4, LIPOXYGENASE 3/4
- LRR, leucine-rich repeat
- MAPK3/6, MAP Kinase 3/6
- MKK4/5, MAP Kinase Kinase 4/5
- NEV, NEVERSHED
- NPR1, NONEXPRESSOR OF PR GENES 1
- PG , POLYGALATURONASE
- PR1, Pathogenesis-related Protein 1
- SERK1, SOMATIC EMBRYO RECEPTOR-LIKE KIASE 1
- TCP4, TEOSINTE BRANCHED/CYCLOIDEA/PCF4
- XTH , XYLOGLUCAN ENDOTRANSGLUCOSYLASE/HYDROLASE
- ein2-1, ethylene insensitive 2-1
- ethylene
- etr1-1, ethylene response1-1
- floral organ abscission
- flower senescence
- ida, inflorescence deficient in abscission
- inflorescence meristem
- jasmonic acid
- reproductive development
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Affiliation(s)
- Joonyup Kim
- Soybean Genomics and Improvement Laboratory; Agricultural Research Service; USDA; Beltsville, MD USA
- Correspondence to: Joonyup Kim;
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Gubert CM, Liljegren SJ. HAESA and HAESA-LIKE2 activate organ abscission downstream of NEVERSHED and EVERSHED in Arabidopsis flowers. PLANT SIGNALING & BEHAVIOR 2014; 9:e29115. [PMID: 25763490 PMCID: PMC4203531 DOI: 10.4161/psb.29115] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
A ligand-receptor module comprised of the peptide inflorescence deficient in abscission (IDA) and the receptor-like kinases HAESA (HAE) and HAESA-LIKE2 (HSL2) activates organ abscission in Arabidopsis flowers. Another set of receptor-like kinases, including EVERSHED (EVR), restricts the extent of cell separation in abscission zones by potentially altering HAE/HSL2 localization or activity. The NEVERSHED (NEV) ADP-ribosylation factor GTPase-activating protein facilitates the intracellular movement of molecules required for organ abscission and fruit growth. Here we report further analysis of the relationship between NEV-mediated intracellular traffic, EVR activity and IDA-HAE/HSL2 signaling during flower development. Our results support a model in which cell separation is mediated by HAE/HSL2 signaling downstream of NEV and EVR. We discuss the possibility that conserved circuits control organ abscission and modulate fruit growth.
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Li J, Tax FE. Receptor-like kinases: key regulators of plant development and defense. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2013; 55:1184-7. [PMID: 24308569 DOI: 10.1111/jipb.12129] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Affiliation(s)
- Jia Li
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
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