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Wei Y, Li A, Zhao Y, Li W, Dong Z, Zhang L, Zhu Y, Zhang H, Gao Y, Zhang Q. Time-Course Transcriptomic Analysis Reveals Molecular Insights into the Inflorescence and Flower Development of Cardiocrinum giganteum. PLANTS (BASEL, SWITZERLAND) 2024; 13:649. [PMID: 38475495 DOI: 10.3390/plants13050649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/14/2024] [Accepted: 02/19/2024] [Indexed: 03/14/2024]
Abstract
Cardiocrinum giganteum is an endemic species of east Asia which is famous for its showy inflorescence and medicinal bulbs. Its inflorescence is a determinate raceme and the flowers bloom synchronously. Morphological observation and time-course transcriptomic analysis were combined to study the process of inflorescence and flower development of C. giganteum. The results show that the autonomic pathway, GA pathway, and the vernalization pathway are involved in the flower formation pathway of C. giganteum. A varied ABCDE flowering model was deduced from the main development process. Moreover, it was found that the flowers in different parts of the raceme in C. giganteum gradually synchronized during development, which is highly important for both evolution and ecology. The results obtained in this work improve our understanding of the process and mechanism of inflorescence and flower development and could be useful for the flowering period regulation and breeding of C. giganteum.
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Affiliation(s)
- Yu Wei
- Beijing Laboratory of Urban and Rural Ecological Environment, School of Landscape Architecture, Beijing Forestry University, Beijing 100083, China
- Key Laboratory of National Forestry and Grassland Administration on Plant Ex Situ Conservation, Beijing Botanical Garden, Beijing 100093, China
| | - Aihua Li
- Key Laboratory of National Forestry and Grassland Administration on Plant Ex Situ Conservation, Beijing Botanical Garden, Beijing 100093, China
| | - Yiran Zhao
- Beijing Laboratory of Urban and Rural Ecological Environment, School of Landscape Architecture, Beijing Forestry University, Beijing 100083, China
| | - Wenqi Li
- Key Laboratory of National Forestry and Grassland Administration on Plant Ex Situ Conservation, Beijing Botanical Garden, Beijing 100093, China
| | - Zhiyang Dong
- Key Laboratory of National Forestry and Grassland Administration on Plant Ex Situ Conservation, Beijing Botanical Garden, Beijing 100093, China
| | - Lei Zhang
- Key Laboratory of National Forestry and Grassland Administration on Plant Ex Situ Conservation, Beijing Botanical Garden, Beijing 100093, China
| | - Yuntao Zhu
- Beijing Laboratory of Urban and Rural Ecological Environment, School of Landscape Architecture, Beijing Forestry University, Beijing 100083, China
| | - Hui Zhang
- Key Laboratory of National Forestry and Grassland Administration on Plant Ex Situ Conservation, Beijing Botanical Garden, Beijing 100093, China
| | - Yike Gao
- Beijing Laboratory of Urban and Rural Ecological Environment, School of Landscape Architecture, Beijing Forestry University, Beijing 100083, China
| | - Qixiang Zhang
- Beijing Laboratory of Urban and Rural Ecological Environment, School of Landscape Architecture, Beijing Forestry University, Beijing 100083, China
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Liao J, Zhang Z, Shang Y, Jiang Y, Su Z, Deng X, Pu X, Yang R, Zhang L. Anatomy and Comparative Transcriptome Reveal the Mechanism of Male Sterility in Salvia miltiorrhiza. Int J Mol Sci 2023; 24:10259. [PMID: 37373407 DOI: 10.3390/ijms241210259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 06/08/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
Salvia miltiorrhiza Bunge is an important traditional herb. Salvia miltiorrhiza is distributed in the Sichuan province of China (here called SC). Under natural conditions, it does not bear seeds and its sterility mechanism is still unclear. Through artificial cross, there was defective pistil and partial pollen abortion in these plants. Electron microscopy results showed that the defective pollen wall was caused by delayed degradation of the tapetum. Due to the lack of starch and organelle, the abortive pollen grains showed shrinkage. RNA-seq was performed to explore the molecular mechanisms of pollen abortion. KEGG enrichment analysis suggested that the pathways of phytohormone, starch, lipid, pectin, and phenylpropanoid affected the fertility of S. miltiorrhiza. Moreover, some differentially expressed genes involved in starch synthesis and plant hormone signaling were identified. These results contribute to the molecular mechanism of pollen sterility and provide a more theoretical foundation for molecular-assisted breeding.
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Affiliation(s)
- Jinqiu Liao
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
- Sichuan Provincial Engineering Research Center for Breeding Technology of Authentic Traditional Chinese Medicine, Sichuan Agricultural University, Ya'an 625014, China
| | - Zhizhou Zhang
- Sichuan Provincial Engineering Research Center for Breeding Technology of Authentic Traditional Chinese Medicine, Sichuan Agricultural University, Ya'an 625014, China
- College of Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Yukun Shang
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
- Sichuan Provincial Engineering Research Center for Breeding Technology of Authentic Traditional Chinese Medicine, Sichuan Agricultural University, Ya'an 625014, China
| | - Yuanyuan Jiang
- Sichuan Provincial Engineering Research Center for Breeding Technology of Authentic Traditional Chinese Medicine, Sichuan Agricultural University, Ya'an 625014, China
- College of Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Zixuan Su
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
- Sichuan Provincial Engineering Research Center for Breeding Technology of Authentic Traditional Chinese Medicine, Sichuan Agricultural University, Ya'an 625014, China
| | - Xuexue Deng
- Sichuan Provincial Engineering Research Center for Breeding Technology of Authentic Traditional Chinese Medicine, Sichuan Agricultural University, Ya'an 625014, China
- College of Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Xiang Pu
- Sichuan Provincial Engineering Research Center for Breeding Technology of Authentic Traditional Chinese Medicine, Sichuan Agricultural University, Ya'an 625014, China
- College of Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Ruiwu Yang
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China
- Sichuan Provincial Engineering Research Center for Breeding Technology of Authentic Traditional Chinese Medicine, Sichuan Agricultural University, Ya'an 625014, China
| | - Li Zhang
- Sichuan Provincial Engineering Research Center for Breeding Technology of Authentic Traditional Chinese Medicine, Sichuan Agricultural University, Ya'an 625014, China
- College of Science, Sichuan Agricultural University, Ya'an 625014, China
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Zhang YS, Xu Y, Xing WT, Wu B, Huang DM, Ma FN, Zhan RL, Sun PG, Xu YY, Song S. Identification of the passion fruit ( Passiflora edulis Sims) MYB family in fruit development and abiotic stress, and functional analysis of PeMYB87 in abiotic stresses. FRONTIERS IN PLANT SCIENCE 2023; 14:1124351. [PMID: 37215287 PMCID: PMC10196401 DOI: 10.3389/fpls.2023.1124351] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 03/21/2023] [Indexed: 05/24/2023]
Abstract
Environmental stresses are ubiquitous in agricultural cultivation, and they affect the healthy growth and development of edible tissues in passion fruit. The study of resistance mechanisms is important in understanding the adaptation and resistance of plants to environmental stresses. In this work, two differently resistant passion fruit varieties were selected, using the expression characteristics of the transcription factor MYB, to explore the resistance mechanism of the MYB gene under various environmental stresses. A total of 174 MYB family members were identified using high-quality passion fruit genomes: 98 2R-MYB, 5 3R-MYB, and 71 1R-MYB (MYB-relate). Their family information was systematically analyzed, including subcellular localization, physicochemical properties, phylogeny at the genomic level, promoter function, encoded proteins, and reciprocal regulation. In this study, bioinformatics and transcriptome sequencing were used to identify members of the PeMYB genes in passion fruit whole-genome data, and biological techniques, such as qPCR, gene clone, and transient transformation of yeast, were used to determine the function of the passion fruit MYB genes in abiotic stress tolerance. Transcriptomic data were obtained for differential expression characteristics of two resistant and susceptible varieties, three expression patterns during pulp development, and four induced expression patterns under abiotic stress conditions. We further focused on the resistance mechanism of PeMYB87 in environmental stress, and we selected 10 representative PeMYB genes for quantitative expression verification. Most of the genes were differentially induced by four abiotic stresses, among which PeMYB87 responded significantly to high-temperature-induced expression and overexpression of the PeMYB87 gene in the yeast system. The transgenic PeMYB87 in yeast showed different degrees of stress resistance under exposure to cold, high temperatures, drought, and salt stresses. These findings lay the foundation for further analysis of the biological functions of PeMYBs involved in stress resistance in passion fruit.
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Affiliation(s)
- Yan-shu Zhang
- National Key Laboratory for Tropical Crop Breeding, Haikou Experimental Station, Tropical Crops Genetic Resources Institute, CATAS/ Germplasm Repository of Passiflora, Haikou, Hainan, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Yazhou Bay Seed Laboratory, Sanya, Hainan, China
- College of Landscape and Horticulture, Southwest Forestry University, Kunming, Yunnan, China
| | - Yi Xu
- National Key Laboratory for Tropical Crop Breeding, Haikou Experimental Station, Tropical Crops Genetic Resources Institute, CATAS/ Germplasm Repository of Passiflora, Haikou, Hainan, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Yazhou Bay Seed Laboratory, Sanya, Hainan, China
| | - Wen-ting Xing
- National Key Laboratory for Tropical Crop Breeding, Haikou Experimental Station, Tropical Crops Genetic Resources Institute, CATAS/ Germplasm Repository of Passiflora, Haikou, Hainan, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
| | - Bin Wu
- National Key Laboratory for Tropical Crop Breeding, Haikou Experimental Station, Tropical Crops Genetic Resources Institute, CATAS/ Germplasm Repository of Passiflora, Haikou, Hainan, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
| | - Dong-mei Huang
- National Key Laboratory for Tropical Crop Breeding, Haikou Experimental Station, Tropical Crops Genetic Resources Institute, CATAS/ Germplasm Repository of Passiflora, Haikou, Hainan, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
| | - Fu-ning Ma
- National Key Laboratory for Tropical Crop Breeding, Haikou Experimental Station, Tropical Crops Genetic Resources Institute, CATAS/ Germplasm Repository of Passiflora, Haikou, Hainan, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Yazhou Bay Seed Laboratory, Sanya, Hainan, China
| | - Ru-lin Zhan
- National Key Laboratory for Tropical Crop Breeding, Haikou Experimental Station, Tropical Crops Genetic Resources Institute, CATAS/ Germplasm Repository of Passiflora, Haikou, Hainan, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Yazhou Bay Seed Laboratory, Sanya, Hainan, China
| | - Pei-guang Sun
- National Key Laboratory for Tropical Crop Breeding, Haikou Experimental Station, Tropical Crops Genetic Resources Institute, CATAS/ Germplasm Repository of Passiflora, Haikou, Hainan, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Yazhou Bay Seed Laboratory, Sanya, Hainan, China
| | - Yong-yan Xu
- College of Landscape and Horticulture, Southwest Forestry University, Kunming, Yunnan, China
| | - Shun Song
- National Key Laboratory for Tropical Crop Breeding, Haikou Experimental Station, Tropical Crops Genetic Resources Institute, CATAS/ Germplasm Repository of Passiflora, Haikou, Hainan, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Yazhou Bay Seed Laboratory, Sanya, Hainan, China
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Guo X, Li L, Liu X, Zhang C, Yao X, Xun Z, Zhao Z, Yan W, Zou Y, Liu D, Li H, Lu H. MYB2 Is Important for Tapetal PCD and Pollen Development by Directly Activating Protease Expression in Arabidopsis. Int J Mol Sci 2022; 23:ijms23073563. [PMID: 35408924 PMCID: PMC8998314 DOI: 10.3390/ijms23073563] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/16/2022] [Accepted: 03/22/2022] [Indexed: 12/11/2022] Open
Abstract
Tapetal programmed cell death (PCD) is a complex biological process that plays an important role in pollen formation and reproduction. Here, we identified the MYB2 transcription factor expressed in the tapetum from stage 5 to stage 11 that was essential for tapetal PCD and pollen development in Arabidopsis thaliana. Downregulation of MYB2 retarded tapetal degeneration, produced defective pollen, and decreased pollen vitality. EMSA and transcriptional activation analysis revealed that MYB2 acted as an upstream activator and directly regulated expression of the proteases CEP1 and βVPE. The expression of these proteases was lower in the buds of the myb2 mutant. Overexpression of either/both CEP1 or/and βVPE proteases partially recover pollen vitality in the myb2 background. Taken together, our results revealed that MYB2 regulates tapetal PCD and pollen development by directly activating expression of the proteases CEP1 and βVPE. Thus, a transcription factor/proteases regulatory and activated cascade was established for tapetal PCD during another development in Arabidopsis thaliana. Highlight: MYB2 is involved in tapetal PCD and pollen development by directly regulating expression of the protease CEP1 and βVPE and establishes a transcription factor/proteases regulatory and activated cascade.
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Affiliation(s)
- Xiaorui Guo
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China; (X.G.); (H.L.)
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China;
| | - Lihong Li
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Xiatong Liu
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Chong Zhang
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Xiaoyun Yao
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Zhili Xun
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Zhijing Zhao
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Wenwen Yan
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Yirong Zou
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Di Liu
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China;
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
| | - Hui Li
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China; (X.G.); (H.L.)
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China;
- Correspondence:
| | - Hai Lu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China; (X.G.); (H.L.)
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (L.L.); (X.L.); (C.Z.); (X.Y.); (Z.X.); (Z.Z.); (W.Y.); (Y.Z.)
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5
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Zaidi MA, O'Leary SJB, Gagnon C, Chabot D, Wu S, Hubbard K, Tran F, Sprott D, Hassan D, Vucurevich T, Sheedy C, Laroche A, Gleddie S, Robert LS. A triticale tapetal non-specific lipid transfer protein (nsLTP) is translocated to the pollen cell wall. PLANT CELL REPORTS 2020; 39:1185-1197. [PMID: 32638075 DOI: 10.1007/s00299-020-02556-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 06/05/2020] [Indexed: 05/28/2023]
Abstract
A Triticeae type III non-specific lipid transfer protein (nsLTP) was shown for the first time to be translocated from the anther tapetum to the pollen cell wall. Two anther-expressed non-specific lipid transfer proteins (nsLTPs) were identified in triticale (× Triticosecale Wittmack). LTPc3a and LTPc3b contain a putative signal peptide sequence and eight cysteine residues in a C-Xn-C-Xn-CC-Xn-CXC-Xn-C-Xn-C pattern. These proteins belong to the type III class of nsLTPs which are expressed exclusively in the inflorescence of angiosperms. The level of LTPc3 transcript in the anther was highest at the tetrad and uninucleate microspore stages, and absent in mature pollen. In situ hybridization showed that LTPc3 was expressed in the tapetal layer of the developing triticale anther. The expression of the LTPc3 protein peaked at the uninucleate microspore stage, but was also found to be associated with the mature pollen. Accordingly, an LTPc3a::GFP translational fusion expressed in transgenic Brachypodium distachyon first showed activity in the tapetum, then in the anther locule, and later on the mature pollen grain. Altogether, these results represent the first detailed characterization of a Triticeae anther-expressed type III nsLTP with possible roles in pollen cell wall formation.
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Affiliation(s)
- Mohsin Abbas Zaidi
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
- Charlottetown Research and Development Centre, Agriculture and Agri-Food Canada, 440 University Avenue, Charlottetown, PE, C1A 4N6, Canada
| | - Stephen J B O'Leary
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
- Aquatic and Crop Resource Development Research Centre, National Research Council, of Canada, 1411 Oxford Street, Halifax, NS, B3H 3Z1, Canada
| | - Christine Gagnon
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
| | - Denise Chabot
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
| | - Shaobo Wu
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences and Peking Union Medical College, 26 Huacai Road, Chengdu, 610052, Sichuan, China
| | - Keith Hubbard
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
| | - Frances Tran
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
- Lacombe Research and Development Centre, Agriculture and Agri-Food Canada, 6000 C and E Trail, Lacombe, AB, T4L 1W1, Canada
| | - Dave Sprott
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
| | - Dhuha Hassan
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
| | - Tara Vucurevich
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, AB, T1J 4B1, Canada
| | - Claudia Sheedy
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, AB, T1J 4B1, Canada
| | - André Laroche
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, AB, T1J 4B1, Canada
| | - Steve Gleddie
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
| | - Laurian S Robert
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada.
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Xiong SX, Zeng QY, Hou JQ, Hou LL, Zhu J, Yang M, Yang ZN, Lou Y. The temporal regulation of TEK contributes to pollen wall exine patterning. PLoS Genet 2020; 16:e1008807. [PMID: 32407354 PMCID: PMC7252695 DOI: 10.1371/journal.pgen.1008807] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 05/27/2020] [Accepted: 04/28/2020] [Indexed: 11/18/2022] Open
Abstract
Pollen wall consists of several complex layers which form elaborate species-specific patterns. In Arabidopsis, the transcription factor ABORTED MICROSPORE (AMS) is a master regulator of exine formation, and another transcription factor, TRANSPOSABLE ELEMENT SILENCING VIA AT-HOOK (TEK), specifies formation of the nexine layer. However, knowledge regarding the temporal regulatory roles of TEK in pollen wall development is limited. Here, TEK-GFP driven by the AMS promoter was prematurely expressed in the tapetal nuclei, leading to complete male sterility in the pAMS:TEK-GFP (pat) transgenic lines with the wild-type background. Cytological observations in the pat anthers showed impaired callose synthesis and aberrant exine patterning. CALLOSE SYNTHASE5 (CalS5) is required for callose synthesis, and expression of CalS5 in pat plants was significantly reduced. We demonstrated that TEK negatively regulates CalS5 expression after the tetrad stage in wild-type anthers and further discovered that premature TEK-GFP in pat directly represses CalS5 expression through histone modification. Our findings show that TEK flexibly mediates its different functions via different temporal regulation, revealing that the temporal regulation of TEK is essential for exine patterning. Moreover, the result that the repression of CalS5 by TEK after the tetrad stage coincides with the timing of callose wall dissolution suggests that tapetum utilizes temporal regulation of genes to stop callose wall synthesis, which, together with the activation of callase activity, achieves microspore release and pollen wall patterning. To develop into mature pollen grains, microspores require formation of the pollen wall. To date, pollen wall developmental events, including production and transportation of pollen wall components, synthesis and degradation of the callose wall, and deposition and demixing of primexine, have been studied in Arabidopsis, and a number of anther- or tapetum-specific genes involved in pollen wall formation have been uncovered. However, whether the specific expression patterns of these genes contribute to pollen wall development or patterning remains unclear. Here, we show that TEK, a transcription factor that specifies formation of nexine (the inner layer of the pollen wall exine), represses the expression of the callose synthase CalS5 after the tetrad stage, which accurately fits with the timing of callose wall dissolution causing microspore release. Moreover, we show that premature expression of TEK in the wild-type anthers disturbs callose wall synthesis and pollen wall patterning. This work reveals that a pollen wall regulator must be kept under a strict temporal control to perform its functions, and that these temporal controls are coordinated with other pollen wall developmental events to determine pollen wall formation and patterning.
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Affiliation(s)
- Shuang-Xi Xiong
- School of Environmental and Geographical Sciences, Shanghai Normal University, Shanghai, China
| | - Qiu-Ye Zeng
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Jian-Qiao Hou
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Ling-Li Hou
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Jun Zhu
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Min Yang
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Zhong-Nan Yang
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Yue Lou
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
- * E-mail:
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7
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Kovacevic J, Palm D, Jooss D, Bublak D, Simm S, Schleiff E. Co-orthologues of ribosome biogenesis factors in A. thaliana are differentially regulated by transcription factors. PLANT CELL REPORTS 2019; 38:937-949. [PMID: 31087154 DOI: 10.1007/s00299-019-02416-y] [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] [Received: 12/19/2018] [Accepted: 04/29/2019] [Indexed: 06/09/2023]
Abstract
Different genes coding for one ribosome biogenesis factor are differentially expressed and are likely under the control of distinct transcription factors, which contributes to the regulatory space for ribosome maturation. Maturation of ribosomes including rRNA processing and modification, rRNA folding and ribosome protein association requires the function of many ribosome biogenesis factors (RBFs). Recent studies document plant-specific variations of the generally conserved process of ribosome biogenesis. For instance, distinct rRNA maturation pathways and intermediates have been identified, the existence of plant specific RBFs has been proposed and several RBFs are encoded by multiple genes. The latter in combination with the discussed ribosome heterogeneity points to a possible function of the different proteins representing one RBF in diversification of ribosomal compositions. Such factor-based regulation would require a differential regulation of their expression, may be even controlled by different transcription factors. We analyzed the expression profiles of genes coding for putative RBFs and transcription factors. Most of the genes coding for RBFs are expressed in a comparable manner, while different genes coding for a single RBF are often differentially expressed. Based on a selected set of genes we document a function of the transcription factors AtMYC1, AtMYC2, AtbHLH105 and AtMYB26 on the regulation of different RBFs. Moreover, on the example of the RBFs LSG1 and BRX1, both encoded by two genes, we give a first hint on a differential transcription factor dependence of expression. Consistent with this observation, the phenotypic analysis of RBF mutants suggests a relation between LSG1-1 and BRX1-1 expression and the transcription factor MYC1. In summary, we propose that the multiple genes coding for one RBF are required to enlarge the regulatory space for ribosome biogenesis.
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Affiliation(s)
- Jelena Kovacevic
- Institute for Molecular Biosciences, Goethe University, Biocenter/Max von Laue Straße 9/N200/R3.02, 60438, Frankfurt am Main, Germany
| | - Denise Palm
- Institute for Molecular Biosciences, Goethe University, Biocenter/Max von Laue Straße 9/N200/R3.02, 60438, Frankfurt am Main, Germany
| | - Domink Jooss
- Institute for Molecular Biosciences, Goethe University, Biocenter/Max von Laue Straße 9/N200/R3.02, 60438, Frankfurt am Main, Germany
| | - Daniela Bublak
- Institute for Molecular Biosciences, Goethe University, Biocenter/Max von Laue Straße 9/N200/R3.02, 60438, Frankfurt am Main, Germany
| | - Stefan Simm
- Institute for Molecular Biosciences, Goethe University, Biocenter/Max von Laue Straße 9/N200/R3.02, 60438, Frankfurt am Main, Germany
- Frankfurt Institute of Advanced Studies, Frankfurt am Main, Germany
| | - Enrico Schleiff
- Institute for Molecular Biosciences, Goethe University, Biocenter/Max von Laue Straße 9/N200/R3.02, 60438, Frankfurt am Main, Germany.
- Frankfurt Institute of Advanced Studies, Frankfurt am Main, Germany.
- Buchmann Institute for Molecular Life Sciences, Goethe University, Frankfurt am Main, Germany.
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Verma N. Transcriptional regulation of anther development in Arabidopsis. Gene 2018; 689:202-209. [PMID: 30572098 DOI: 10.1016/j.gene.2018.12.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/23/2018] [Accepted: 12/06/2018] [Indexed: 01/15/2023]
Abstract
This review focuses on the current knowledge of transcription factors involved in Arabidopsis anther development. Anther development is a multistage process and controlled by a complex network of transcription factors acting in spatio/temporal manner. Molecular understanding of anther developmental pathway is critical from the perspective of controlling male fertility and hybrid generation. Generation of hybrid lines relies upon the effective mechanisms of controlling the process of pollen development and pollen release. Controlling any developmental program requires a good knowledge of regulatory pathways governing that developmental program. In a regulatory pathway, transcription factors represent an important link between the developmental program and response of genes to growth regulators and environmental signals. Therefore, identifying the entire cohort of anther specific transcription factors is an essential step towards the molecular understanding of regulatory networks involved in pollen formation and pollen release.
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Affiliation(s)
- Neetu Verma
- Department of Genetics, University of Delhi South Campus, Benito Juarez Road, New Delhi 110021, India.
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