1
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Liu S, Li L, Wang W, Xia G, Liu S. TaSRO1 interacts with TaVP1 to modulate seed dormancy and pre-harvest sprouting resistance in wheat. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2024; 66:36-53. [PMID: 38108123 DOI: 10.1111/jipb.13600] [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: 10/14/2023] [Accepted: 12/15/2023] [Indexed: 12/19/2023]
Abstract
Dormancy is an adaptive trait which prevents seeds from germinating under unfavorable environmental conditions. Seeds with weak dormancy undergo pre-harvest sprouting (PHS) which decreases grain yield and quality. Understanding the genetic mechanisms that regulate seed dormancy and resistance to PHS is crucial for ensuring global food security. In this study, we illustrated the function and molecular mechanism of TaSRO1 in the regulation of seed dormancy and PHS resistance by suppressing TaVP1. The tasro1 mutants exhibited strong seed dormancy and enhanced resistance to PHS, whereas the mutants of tavp1 displayed weak dormancy. Genetic evidence has shown that TaVP1 is epistatic to TaSRO1. Biochemical evidence has shown that TaSRO1 interacts with TaVP1 and represses the transcriptional activation of the PHS resistance genes TaPHS1 and TaSdr. Furthermore, TaSRO1 undermines the synergistic activation of TaVP1 and TaABI5 in PHS resistance genes. Finally, we highlight the great potential of tasro1 alleles for breeding elite wheat cultivars that are resistant to PHS.
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Affiliation(s)
- Shupeng Liu
- Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University, Qingdao, 266237, China
| | - Li Li
- Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University, Qingdao, 266237, China
| | - Wenlong Wang
- Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University, Qingdao, 266237, China
| | - Guangmin Xia
- Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University, Qingdao, 266237, China
| | - Shuwei Liu
- Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University, Qingdao, 266237, China
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2
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Yang C, Li X, Chen S, Liu C, Yang L, Li K, Liao J, Zheng X, Li H, Li Y, Zeng S, Zhuang X, Rodriguez PL, Luo M, Wang Y, Gao C. ABI5-FLZ13 module transcriptionally represses growth-related genes to delay seed germination in response to ABA. PLANT COMMUNICATIONS 2023; 4:100636. [PMID: 37301981 PMCID: PMC10721476 DOI: 10.1016/j.xplc.2023.100636] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 05/05/2023] [Accepted: 06/06/2023] [Indexed: 06/12/2023]
Abstract
The bZIP transcription factor ABSCISIC ACID INSENSITIVE5 (ABI5) is a master regulator of seed germination and post-germinative growth in response to abscisic acid (ABA), but the detailed molecular mechanism by which it represses plant growth remains unclear. In this study, we used proximity labeling to map the neighboring proteome of ABI5 and identified FCS-LIKE ZINC FINGER PROTEIN 13 (FLZ13) as a novel ABI5 interaction partner. Phenotypic analysis of flz13 mutants and FLZ13-overexpressing lines demonstrated that FLZ13 acts as a positive regulator of ABA signaling. Transcriptomic analysis revealed that both FLZ13 and ABI5 downregulate the expression of ABA-repressed and growth-related genes involved in chlorophyll biosynthesis, photosynthesis, and cell wall organization, thereby repressing seed germination and seedling establishment in response to ABA. Further genetic analysis showed that FLZ13 and ABI5 function together to regulate seed germination. Collectively, our findings reveal a previously uncharacterized transcriptional regulatory mechanism by which ABA mediates inhibition of seed germination and seedling establishment.
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Affiliation(s)
- Chao Yang
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China.
| | - Xibao Li
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China
| | - Shunquan Chen
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China
| | - Chuanliang Liu
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China
| | - Lianming Yang
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China
| | - Kailin Li
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China
| | - Jun Liao
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China
| | - Xuanang Zheng
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China
| | - Hongbo Li
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China
| | - Yongqing Li
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Shaohua Zeng
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Xiaohong Zhuang
- School of Life Sciences, Centre for Cell and Developmental Biology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Pedro L Rodriguez
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, 46022 Valencia, Spain
| | - Ming Luo
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
| | - Ying Wang
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
| | - Caiji Gao
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University (SCNU), Guangzhou 510631, China.
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3
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Jardim-Messeder D, Cassol D, Souza-Vieira Y, Ehlers Loureiro M, Girke T, Boroni M, Lopes Corrêa R, Coelho A, Sachetto-Martins G. Genome-wide identification of core components of ABA signaling and transcriptome analysis reveals gene circuits involved in castor bean (Ricinus communis L.) response to drought. Gene 2023; 883:147668. [PMID: 37500024 DOI: 10.1016/j.gene.2023.147668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/06/2023] [Accepted: 07/24/2023] [Indexed: 07/29/2023]
Abstract
Castor bean (Ricinus communis L.) can withstand long periods of water deficit and high temperatures, and therefore has been recognized as a drought-resistant plant species, allowing the study of gene networks involved in drought response and tolerance. The identification of genes networks related to drought response in this plant may yield important information in the characterization of molecular mechanisms correlating changes in the gene expression with the physiological adaptation processes. In this context, gene families related to abscisic acid (ABA) signaling play a crucial role in developmental and environmental adaptation processes of plants to drought stress. However, the families that function as the core components of ABA signaling, as well as genes networks related to drought response, are not well understood in castor bean. In this study 7 RcPYL, 63 RcPP2C, and 6 RcSnRK2 genes were identified in castor bean genome, which was further supported by chromosomal distribution, gene structure, evolutionary relationships, and conserved motif analyses. The castor bean general expression profile was investigated by RNAseq in root and leaf tissues in response to drought stress. These analyses allowed the identification of genes differentially expressed, including genes from the ABA signaling core, genes related to photosynthesis, cell wall, energy transduction, antioxidant response, and transcription factors. These analyses provide new insights into the core components of ABA signaling in castor bean, allow the identification of several molecular responses associated with the high physiological adaptation of castor bean to drought stress, and contribute to the identification of candidate genes for genetic improvement.
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Affiliation(s)
- Douglas Jardim-Messeder
- Departamento de Genética, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Instituto de Bioquímica Médica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Daniela Cassol
- Departamento de Genética, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Institute for Integrative Genome Biology, Genomics Building, University of California, Riverside, CA 92521, USA
| | - Ygor Souza-Vieira
- Departamento de Genética, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Thomas Girke
- Institute for Integrative Genome Biology, Genomics Building, University of California, Riverside, CA 92521, USA
| | - Mariana Boroni
- Bioinformatics and Computational Laboratory, Instituto Nacional de Câncer José Alencar Gomes da Silva, Rio de Janeiro, Brazil
| | - Régis Lopes Corrêa
- Departamento de Genética, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ana Coelho
- Departamento de Genética, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
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4
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Sybilska E, Daszkowska-Golec A. A complex signaling trio in seed germination: Auxin-JA-ABA. TRENDS IN PLANT SCIENCE 2023; 28:873-875. [PMID: 37208202 DOI: 10.1016/j.tplants.2023.05.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 05/05/2023] [Accepted: 05/09/2023] [Indexed: 05/21/2023]
Abstract
Recently. Mei et al. discovered the molecular mechanism behind the synergistic action of auxins and jasmonates in enhancing the role of abscisic acid (ABA) in seed germination. They found that JASMONATE-ZIM DOMAIN (JAZ) proteins interact with AUXIN RESPONSE FACTOR (ARF)-16 to mediate auxin-jasmonic acid (JA) crosstalk. Furthermore, they revealed that ARF16 interacts with ABSCISIC ACID INSENSITIVE (ABI)-5 and positively modulates ABA responses at seed germination.
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Affiliation(s)
- Ewa Sybilska
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Jagiellońska 28, 40-032 Katowice, Poland
| | - Agata Daszkowska-Golec
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Jagiellońska 28, 40-032 Katowice, Poland.
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5
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Zhang J, Zhao P, Chen S, Sun L, Mao J, Tan S, Xiang C. The ABI3-ERF1 module mediates ABA-auxin crosstalk to regulate lateral root emergence. Cell Rep 2023; 42:112809. [PMID: 37450369 DOI: 10.1016/j.celrep.2023.112809] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 06/03/2023] [Accepted: 06/28/2023] [Indexed: 07/18/2023] Open
Abstract
Abscisic acid (ABA) is involved in lateral root (LR) development, but how ABA signaling interacts with auxin signaling to regulate LR formation is not well understood. Here, we report that ABA-responsive ERF1 mediates the crosstalk between ABA and auxin signaling to regulate Arabidopsis LR emergence. ABI3 is a negative factor in LR emergence and transcriptionally activates ERF1 by binding to its promoter, and reciprocally, ERF1 activates ABI3, which forms a regulatory loop that enables rapid signal amplification. Notably, ABI3 physically interacts with ERF1, reducing the cis element-binding activities of both ERF1 and ABI3 and thus attenuating the expression of ERF1-/ABI3-regulated genes involved in LR emergence and ABA signaling, such as PIN1, AUX1, ARF7, and ABI5, which may provide a molecular rheostat to avoid overamplification of auxin and ABA signaling. Taken together, our findings identify the role of the ABI3-ERF1 module in mediating crosstalk between ABA and auxin signaling in LR emergence.
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Affiliation(s)
- Jing Zhang
- Division of Life Sciences and Medicine, Division of Molecular & Cell Biophysics, Hefei National Science Center for Interdisciplinary Sciences at the Microscale, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, University of Science and Technology of China, The Innovation Academy of Seed Design, Chinese Academy of Sciences, Hefei, Anhui Province 230027, China
| | - Pingxia Zhao
- Division of Life Sciences and Medicine, Division of Molecular & Cell Biophysics, Hefei National Science Center for Interdisciplinary Sciences at the Microscale, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, University of Science and Technology of China, The Innovation Academy of Seed Design, Chinese Academy of Sciences, Hefei, Anhui Province 230027, China.
| | - Siyan Chen
- Division of Life Sciences and Medicine, Division of Molecular & Cell Biophysics, Hefei National Science Center for Interdisciplinary Sciences at the Microscale, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, University of Science and Technology of China, The Innovation Academy of Seed Design, Chinese Academy of Sciences, Hefei, Anhui Province 230027, China
| | - Liangqi Sun
- Division of Life Sciences and Medicine, Division of Molecular & Cell Biophysics, Hefei National Science Center for Interdisciplinary Sciences at the Microscale, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, University of Science and Technology of China, The Innovation Academy of Seed Design, Chinese Academy of Sciences, Hefei, Anhui Province 230027, China
| | - Jieli Mao
- Division of Life Sciences and Medicine, Division of Molecular & Cell Biophysics, Hefei National Science Center for Interdisciplinary Sciences at the Microscale, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, University of Science and Technology of China, The Innovation Academy of Seed Design, Chinese Academy of Sciences, Hefei, Anhui Province 230027, China
| | - Shutang Tan
- Division of Life Sciences and Medicine, Division of Molecular & Cell Biophysics, Hefei National Science Center for Interdisciplinary Sciences at the Microscale, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, University of Science and Technology of China, The Innovation Academy of Seed Design, Chinese Academy of Sciences, Hefei, Anhui Province 230027, China
| | - Chengbin Xiang
- Division of Life Sciences and Medicine, Division of Molecular & Cell Biophysics, Hefei National Science Center for Interdisciplinary Sciences at the Microscale, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, University of Science and Technology of China, The Innovation Academy of Seed Design, Chinese Academy of Sciences, Hefei, Anhui Province 230027, China.
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6
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Tounosu N, Sesoko K, Hori K, Shimojima M, Ohta H. Cis-regulatory elements and transcription factors related to auxin signaling in the streptophyte algae Klebsormidium nitens. Sci Rep 2023; 13:9635. [PMID: 37322074 PMCID: PMC10272232 DOI: 10.1038/s41598-023-36500-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 06/05/2023] [Indexed: 06/17/2023] Open
Abstract
The phytohormone auxin affects numerous processes in land plants. The central auxin signaling machinery, called the nuclear auxin pathway, is mediated by its pivotal receptor named TRANSPORT INHIBITOR RESPONSE 1/AUXIN SIGNALING F-BOX (TIR1/AFB). The nuclear auxin pathway is widely conserved in land plants, but auxin also accumulates in various algae. Although auxin affects the growth of several algae, the components that mediate auxin signaling have not been identified. We previously reported that exogenous auxin suppresses cell proliferation in the Klebsormidium nitens that is a member of streptophyte algae, a paraphyletic group sharing the common ancestor with land plants. Although K. nitens lacks TIR1/AFB, auxin affects the expression of numerous genes. Thus, elucidation of the mechanism of auxin-inducible gene expression in K. nitens would provide important insights into the evolution of auxin signaling. Here, we show that some motifs are enriched in the promoter sequences of auxin-inducible genes in K. nitens. We also found that the transcription factor KnRAV activates several auxin-inducible genes and directly binds the promoter of KnLBD1, a representative auxin-inducible gene. We propose that KnRAV has the potential to regulate auxin-responsive gene expression in K. nitens.
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Affiliation(s)
- Noriaki Tounosu
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 B-65, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, 226-8501, Japan
| | - Kanami Sesoko
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 B-65, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, 226-8501, Japan
| | - Koichi Hori
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 B-65, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, 226-8501, Japan.
| | - Mie Shimojima
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 B-65, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, 226-8501, Japan
| | - Hiroyuki Ohta
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 B-65, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, 226-8501, Japan.
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7
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Le QT, Truong HA, Nguyen DT, Yang S, Xiong L, Lee H. Enhanced growth performance of abi5 plants under high salt and nitrate is associated with reduced nitric oxide levels. JOURNAL OF PLANT PHYSIOLOGY 2023; 286:154000. [PMID: 37207503 DOI: 10.1016/j.jplph.2023.154000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 04/23/2023] [Accepted: 04/29/2023] [Indexed: 05/21/2023]
Abstract
Numerous environmental stresses have a significant impact on plant growth and development. By 2050, it is anticipated that high salinity will destroy more than fifty percent of the world's agricultural land. Understanding how plants react to the excessive use of nitrogen fertilizers and salt stress is crucial for enhancing crop yield. However, the effect of excessive nitrate treatment on plant development is disputed and poorly understood; so, we evaluated the effect of excessive nitrate supply and high salinity on abi5 plant growth performance. We demonstrated that abi5 plants are tolerant to the harmful environmental conditions of excessive nitrate and salt. abi5 plants have lower amounts of endogenous nitric oxide than Arabidopsis thaliana Columbia-0 plants due to their decreased nitrate reductase activity, caused by a decrease in the transcript level of NIA2, a gene encoding nitrate reductase. Nitric oxide appeared to have a critical role in reducing the salt stress tolerance of plants, which was diminished by an excess of nitrate. Discovering regulators such as ABI5 that can modulate nitrate reductase activity and comprehending the molecular activities of these regulators are crucial for the application of gene-editing techniques. This would result in the appropriate buildup of nitric oxide to increase the production of crops subjected to a variety of environmental stresses.
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Affiliation(s)
- Quang Tri Le
- Department of Plant Biotechnology, College of Life Sciences and Biotechnology, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul, 136-713, Republic of Korea
| | - Hai An Truong
- Department of Plant Biotechnology, College of Life Sciences and Biotechnology, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul, 136-713, Republic of Korea
| | - Dinh Thanh Nguyen
- Department of Plant Biotechnology, College of Life Sciences and Biotechnology, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul, 136-713, Republic of Korea
| | - Seonyoung Yang
- Department of Plant Biotechnology, College of Life Sciences and Biotechnology, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul, 136-713, Republic of Korea
| | - Liming Xiong
- Department of Biology, Hong Kong Baptist University, Kowloon Tang, Hong Kong, China
| | - Hojoung Lee
- Department of Plant Biotechnology, College of Life Sciences and Biotechnology, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul, 136-713, Republic of Korea.
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8
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Sybilska E, Daszkowska-Golec A. Alternative splicing in ABA signaling during seed germination. FRONTIERS IN PLANT SCIENCE 2023; 14:1144990. [PMID: 37008485 PMCID: PMC10060653 DOI: 10.3389/fpls.2023.1144990] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Accepted: 03/02/2023] [Indexed: 06/19/2023]
Abstract
Seed germination is an essential step in a plant's life cycle. It is controlled by complex physiological, biochemical, and molecular mechanisms and external factors. Alternative splicing (AS) is a co-transcriptional mechanism that regulates gene expression and produces multiple mRNA variants from a single gene to modulate transcriptome diversity. However, little is known about the effect of AS on the function of generated protein isoforms. The latest reports indicate that alternative splicing (AS), the relevant mechanism controlling gene expression, plays a significant role in abscisic acid (ABA) signaling. In this review, we present the current state of the art about the identified AS regulators and the ABA-related changes in AS during seed germination. We show how they are connected with the ABA signaling and the seed germination process. We also discuss changes in the structure of the generated AS isoforms and their impact on the functionality of the generated proteins. Also, we point out that the advances in sequencing technology allow for a better explanation of the role of AS in gene regulation by more accurate detection of AS events and identification of full-length splicing isoforms.
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9
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Mei S, Zhang M, Ye J, Du J, Jiang Y, Hu Y. Auxin contributes to jasmonate-mediated regulation of abscisic acid signaling during seed germination in Arabidopsis. THE PLANT CELL 2023; 35:1110-1133. [PMID: 36516412 PMCID: PMC10015168 DOI: 10.1093/plcell/koac362] [Citation(s) in RCA: 25] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 10/21/2022] [Accepted: 12/09/2022] [Indexed: 05/30/2023]
Abstract
Abscisic acid (ABA) represses seed germination and postgerminative growth in Arabidopsis thaliana. Auxin and jasmonic acid (JA) stimulate ABA function; however, the possible synergistic effects of auxin and JA on ABA signaling and the underlying molecular mechanisms remain elusive. Here, we show that exogenous auxin works synergistically with JA to enhance the ABA-induced delay of seed germination. Auxin biosynthesis, perception, and signaling are crucial for JA-promoted ABA responses. The auxin-dependent transcription factors AUXIN RESPONSE FACTOR10 (ARF10) and ARF16 interact with JASMONATE ZIM-DOMAIN (JAZ) repressors of JA signaling. ARF10 and ARF16 positively mediate JA-increased ABA responses, and overaccumulation of ARF16 partially restores the hyposensitive phenotype of JAZ-accumulating plants defective in JA signaling in response to combined ABA and JA treatment. Furthermore, ARF10 and ARF16 physically associate with ABSCISIC ACID INSENSITIVE5 (ABI5), a critical regulator of ABA signaling, and the ability of ARF16 to stimulate JA-mediated ABA responses is mainly dependent on ABI5. ARF10 and ARF16 activate the transcriptional function of ABI5, whereas JAZ repressors antagonize their effects. Collectively, our results demonstrate that auxin contributes to the synergetic modulation of JA on ABA signaling, and explain the mechanism by which ARF10/16 coordinate with JAZ and ABI5 to integrate the auxin, JA, and ABA signaling pathways.
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Affiliation(s)
- Song Mei
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou 550025, China
| | - Minghui Zhang
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingwen Ye
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Jiancan Du
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
| | - Yanjuan Jiang
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
| | - Yanru Hu
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
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10
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Liu Z, Wang J, Jing H, Li X, Liu T, Ma J, Hu H, Chen M. Linum usitatissimum ABI3 enhances the accumulation of seed storage reserves and tolerance to environmental stresses during seed germination and seedling establishment in Arabidopsis thaliana. JOURNAL OF PLANT PHYSIOLOGY 2023; 280:153893. [PMID: 36502559 DOI: 10.1016/j.jplph.2022.153893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 10/28/2022] [Accepted: 12/05/2022] [Indexed: 06/17/2023]
Abstract
Flax (Linum usitatissimum) is an important oil crop in arid and semi-arid regions of North and Northwest China, and its seeds are rich in nutritious storage reserves, such as polyunsaturated fatty acids (FAs) and proteins. However, the regulatory networks that control the accumulation of seed storage reserves in flax are still largely unknown. In this study, we found that LuABI3-1 and LuABI3-2 homologs from the flax cultivar 'Longya 10' play important roles in regulating the accumulation of seed storage reserves in Arabidopsis thaliana. The results of subcellular localization and transcriptional activity assays showed that both LuABI3-1 and LuABI3-2 function as transcription factors. Overexpression of either LuABI3-1 or LuABI3-2 resulted in the significant increase in the contents of total seed FAs and storage proteins, but did not alter other key agronomic traits in A. thaliana. Accordingly, the expression of key genes involved in the biosynthesis of FAs and storage proteins was also greatly up-regulated in the developing seeds of LuABI3-1-overexpression lines. Additionally, both LuABI3-1 and LuABI3-2 enhanced the tolerance to the high salt and mannitol stresses during seed germination and seedling establishment in A. thaliana. These results increase our understanding of the LuABI3 regulatory functions and provide promising targets for genetic manipulation of L. usitatissimum to innovate the germplasm resources and cultivate high yield and quality varieties.
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Affiliation(s)
- Zijin Liu
- National Yangling Agricultural Biotechnology & Breeding Center, Shaanxi Key Laboratory of Crop Heterosis, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Jianjun Wang
- National Yangling Agricultural Biotechnology & Breeding Center, Shaanxi Key Laboratory of Crop Heterosis, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Huafei Jing
- National Yangling Agricultural Biotechnology & Breeding Center, Shaanxi Key Laboratory of Crop Heterosis, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Xinye Li
- National Yangling Agricultural Biotechnology & Breeding Center, Shaanxi Key Laboratory of Crop Heterosis, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Tiantian Liu
- National Yangling Agricultural Biotechnology & Breeding Center, Shaanxi Key Laboratory of Crop Heterosis, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Jun Ma
- National Yangling Agricultural Biotechnology & Breeding Center, Shaanxi Key Laboratory of Crop Heterosis, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Huan Hu
- National Yangling Agricultural Biotechnology & Breeding Center, Shaanxi Key Laboratory of Crop Heterosis, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Mingxun Chen
- National Yangling Agricultural Biotechnology & Breeding Center, Shaanxi Key Laboratory of Crop Heterosis, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China.
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11
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Gao Z, Zhou Y, He Y. Molecular epigenetic mechanisms for the memory of temperature stresses in plants. J Genet Genomics 2022; 49:991-1001. [PMID: 35870761 DOI: 10.1016/j.jgg.2022.07.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 07/13/2022] [Accepted: 07/13/2022] [Indexed: 12/29/2022]
Abstract
The sessile plants encounter various stresses; some are prolonged, whereas some others are recurrent. Temperature is crucial for plant growth and development, and plants often encounter adverse high temperature fluctuations (heat stresses) as well as prolonged cold exposure such as seasonal temperature drops in winter when grown in temperate regions. Many plants can remember past temperature stresses to get adapted to adverse local temperature changes to ensure survival and/or reproductive success. Here, we summarize chromatin-based mechanisms underlying acquired thermotolerance or thermomemory in plants and review recent progresses on molecular epigenetic understanding of 'remembering of prolonged cold in winter' or vernalization, a process critical for various over-wintering plants to acquire competence to flower in the coming spring. In addition, perspectives on future study in temperature stress memories of economically-important crops are discussed.
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Affiliation(s)
- Zhaoxu Gao
- State Key Laboratory of Protein and Plant Gene Research, School of Advanced Agricultural Sciences, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Yue Zhou
- State Key Laboratory of Protein and Plant Gene Research, School of Advanced Agricultural Sciences, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Yuehui He
- State Key Laboratory of Protein and Plant Gene Research, School of Advanced Agricultural Sciences, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China; Peking University Institute of Advanced Agricultural Sciences, Weifang, Shandong 261325, China.
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12
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Zhao H, Zhang Y, Zheng Y. Integration of ABA, GA, and light signaling in seed germination through the regulation of ABI5. FRONTIERS IN PLANT SCIENCE 2022; 13:1000803. [PMID: 36092418 PMCID: PMC9449724 DOI: 10.3389/fpls.2022.1000803] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 08/08/2022] [Indexed: 06/01/2023]
Abstract
Seed germination is precisely controlled by a variety of signals, among which light signals and the phytohormones abscisic acid (ABA) and gibberellin (GA) play crucial roles. New findings have greatly increased our understanding of the mechanisms by which these three signals regulate seed germination and the close connections between them. Although much work has been devoted to ABA, GA, and light signal interactions, there is still no systematic description of their combination, especially in seed germination. In this review, we integrate ABA, GA, and light signaling in seed germination through the direct and indirect regulation of ABSCISIC ACID INSENSITIVE5 (ABI5), the core transcription factor that represses seed germination in ABA signaling, into our current understanding of the regulatory mechanism of seed germination.
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Affiliation(s)
- Hongyun Zhao
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, China
- Sanya Institute of Henan University, Sanya, China
| | - Yamei Zhang
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, China
- Sanya Institute of Henan University, Sanya, China
| | - Yuan Zheng
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, China
- Sanya Institute of Henan University, Sanya, China
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13
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Geng W, Wang Y, Zhang J, Liu Z, Chen X, Qin L, Yang L, Tang H. Genome-wide identification and expression analyses of late embryogenesis abundant (LEA) gene family in tobacco (Nicotiana tabacum L.) reveal their function in abiotic stress responses. Gene 2022; 836:146665. [PMID: 35691407 DOI: 10.1016/j.gene.2022.146665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 04/11/2022] [Accepted: 06/06/2022] [Indexed: 12/29/2022]
Abstract
Late embryogenesis abundant (LEA) proteins play an important role in plant growth and response to abiotic stresses. However the late embryogenesis abundant (LEA) gene family in Nicotiana tabacum has not been systematically studied. In this study, 123 NtLEA genes were identified in Nicotiana tabacum, and divided into 8 groups, including LEA_1, LEA_2, LEA_3, LEA_4, LEA_5, LEA_6, DHN (dehydratin) and SMP (Seed Maturation Protein). The LEA_2 group is the most abundant of the NtLEA family. The gene structure, conserved motifs, subcellular localization and physicochemical properties of the NtLEA genes were analyzed. RNA-seq and qPCR analyses showed that the NtLEA genes were significantly induced under two different abiotic stresses and showed different expression patterns. The expression patterns of 35 NtLEA genes responding to ABA and 3 NtLEA genes responding to NaCl abiotic stress, respectively, were characterized. The protein-protein interaction network revealed that most NtLEA proteins (>78%) had the potential function to enhance tobacco resistance to abiotic stress. The transcriptional regulatory network showed that 21 transcription factor families were involved in regulating the expression of the NtLEA genes. These results are beneficial for future studies of the function of the NtLEA genes.
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Affiliation(s)
- Weibo Geng
- Shandong Agricultural University, 271000 Taian, China
| | - Yanan Wang
- Shandong Agricultural University, 271000 Taian, China
| | - Jing Zhang
- Shandong Agricultural University, 271000 Taian, China
| | - Zhonghui Liu
- Shandong Agricultural University, 271000 Taian, China
| | - Xingyun Chen
- Shandong Agricultural University, 271000 Taian, China
| | - Liting Qin
- Shandong Agricultural University, 271000 Taian, China
| | - Long Yang
- Shandong Agricultural University, 271000 Taian, China.
| | - Heng Tang
- Shandong Agricultural University, 271000 Taian, China.
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14
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Xu G, Tao Z, He Y. Embryonic reactivation of FLOWERING LOCUS C by ABSCISIC ACID-INSENSITIVE 3 establishes the vernalization requirement in each Arabidopsis generation. THE PLANT CELL 2022; 34:2205-2221. [PMID: 35234936 PMCID: PMC9134069 DOI: 10.1093/plcell/koac077] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 02/26/2022] [Indexed: 06/14/2023]
Abstract
Many over-wintering plants grown in temperate climate acquire competence to flower upon prolonged cold exposure in winter, through vernalization. In Arabidopsis thaliana, prolonged cold exposure induces the silencing of the potent floral repressor FLOWERING LOCUS C (FLC) through repressive chromatin modifications by Polycomb proteins. This repression is maintained to enable flowering after return to warmth, but is reset during seed development. Here, we show that embryonic FLC reactivation occurs in two phases: resetting of cold-induced FLC silencing during embryogenesis and further FLC activation during embryo maturation. We found that the B3 transcription factor (TF) ABSCISIC ACID-INSENSITIVE 3 (ABI3) mediates both FLC resetting in embryogenesis and further activation of FLC expression in embryo maturation. ABI3 binds to the cis-acting cold memory element at FLC and recruits a scaffold protein with active chromatin modifiers to reset FLC chromatin into an active state in late embryogenesis. Moreover, in response to abscisic acid (ABA) accumulation during embryo maturation, ABI3, together with the basic leucine zipper TF ABI5, binds to an ABA-responsive cis-element to further activate FLC expression to high level. Therefore, we have uncovered the molecular circuitries underlying embryonic FLC reactivation following parental vernalization, which ensures that each generation must experience winter cold prior to flowering.
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15
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Molecular Aspects of Seed Development Controlled by Gibberellins and Abscisic Acids. Int J Mol Sci 2022; 23:ijms23031876. [PMID: 35163798 PMCID: PMC8837179 DOI: 10.3390/ijms23031876] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/31/2022] [Accepted: 02/02/2022] [Indexed: 11/16/2022] Open
Abstract
Plants have evolved seeds to permit the survival and dispersion of their lineages by providing nutrition for embryo growth and resistance to unfavorable environmental conditions. Seed formation is a complicated process that can be roughly divided into embryogenesis and the maturation phase, characterized by accumulation of storage compound, acquisition of desiccation tolerance, arrest of growth, and acquisition of dormancy. Concerted regulation of several signaling pathways, including hormonal and metabolic signals and gene networks, is required to accomplish seed formation. Recent studies have identified the major network of genes and hormonal signals in seed development, mainly in maturation. Gibberellin (GA) and abscisic acids (ABA) are recognized as the main hormones that antagonistically regulate seed development and germination. Especially, knowledge of the molecular mechanism of ABA regulation of seed maturation, including regulation of dormancy, accumulation of storage compounds, and desiccation tolerance, has been accumulated. However, the function of ABA and GA during embryogenesis still remains elusive. In this review, we summarize the current understanding of the sophisticated molecular networks of genes and signaling of GA and ABA in the regulation of seed development from embryogenesis to maturation.
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16
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Lee SE, Yoon IS, Hwang YS. Abscisic acid activation of oleosin gene HvOle3 expression prevents the coalescence of protein storage vacuoles in barley aleurone cells. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:817-834. [PMID: 34698829 DOI: 10.1093/jxb/erab471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 10/22/2021] [Indexed: 06/13/2023]
Abstract
Protein storage vacuoles (PSVs) in aleurone cells coalesce during germination, and this process is highly coupled with mobilization of PSV reserves, allowing de novo synthesis of various hydrolases in aleurone cells for endosperm degradation. Here we show that in barley (Hordeum vulgare L.) oleosins, the major integral proteins of oleosomes are encoded by four genes (HvOle1 to 4), and the expression of HvOle1 and HvOle3 is strongly up-regulated by abscisic acid (ABA), which shows antagonism to gibberellic acid. In aleurone cells, all HvOLEs were subcellularly targeted to the tonoplast of PSVs. Gain-of-function analyses revealed that HvOLE3 effectively delayed PSV coalescence, whereas HvOLE1 only had a moderate effect, with no notable effect of HvOLE2 and 4. With regard to longevity, HvOLE3 chiefly outperformed other HvOLEs, followed by HvOLE1. Experiments swapping the N- and C-terminal domain between HvOLE3 and other HvOLEs showed that the N-terminal region of HvOLE3 is mainly responsible, with some positive effect by the C-terminal region, for mediating the specific preventive effect of HvOLE3 on PSV coalescence. Three ACGT-core elements and the RY-motif were responsible for ABA induction of HvOle3 promoter activity. Transient expression assays using aleurone protoplasts demonstrated that transcriptional activation of the HvOle3 promoter was mediated by transcription factors HvABI3 and HvABI5, which acted downstream of protein kinase HvPKABA1.
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Affiliation(s)
- Sung-Eun Lee
- Department of Systems Biotechnology, Konkuk University, Seoul 143-701, Republic of Korea
| | - In Sun Yoon
- Gene Engineering Division, National Institute of Agricultural Sciences, Jeonju 565-851, Republic of Korea
| | - Yong-Sic Hwang
- Department of Systems Biotechnology, Konkuk University, Seoul 143-701, Republic of Korea
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17
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Ali F, Qanmber G, Li F, Wang Z. Updated role of ABA in seed maturation, dormancy, and germination. J Adv Res 2022; 35:199-214. [PMID: 35003801 PMCID: PMC8721241 DOI: 10.1016/j.jare.2021.03.011] [Citation(s) in RCA: 80] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Revised: 03/03/2021] [Accepted: 03/27/2021] [Indexed: 12/17/2022] Open
Abstract
Functional ABA biosynthesis genes show specific roles for ABA accumulation at different stages of seed development and seedling establishment. De novo ABA biosynthesis during embryogenesis is required for late seed development, maturation, and induction of primary dormancy. ABA plays multiple roles with the key LAFL hub to regulate various downstream signaling genes in seed and seedling development. Key ABA signaling genes ABI3, ABI4, and ABI5 play important multiple functions with various cofactors during seed development such as de-greening, desiccation tolerance, maturation, dormancy, and seed vigor. The crosstalk between ABA and other phytohormones are complicated and important for seed development and seedling establishment.
Background Seed is vital for plant survival and dispersion, however, its development and germination are influenced by various internal and external factors. Abscisic acid (ABA) is one of the most important phytohormones that influence seed development and germination. Until now, impressive progresses in ABA metabolism and signaling pathways during seed development and germination have been achieved. At the molecular level, ABA biosynthesis, degradation, and signaling genes were identified to play important roles in seed development and germination. Additionally, the crosstalk between ABA and other hormones such as gibberellins (GA), ethylene (ET), Brassinolide (BR), and auxin also play critical roles. Although these studies explored some actions and mechanisms by which ABA-related factors regulate seed morphogenesis, dormancy, and germination, the complete network of ABA in seed traits is still unclear. Aim of review Presently, seed faces challenges in survival and viability. Due to the vital positive roles in dormancy induction and maintenance, as well as a vibrant negative role in the seed germination of ABA, there is a need to understand the mechanisms of various ABA regulators that are involved in seed dormancy and germination with the updated knowledge and draw a better network for the underlying mechanisms of the ABA, which would advance the understanding and artificial modification of the seed vigor and longevity regulation. Key scientific concept of review Here, we review functions and mechanisms of ABA in different seed development stages and seed germination, discuss the current progresses especially on the crosstalk between ABA and other hormones and signaling molecules, address novel points and key challenges (e.g., exploring more regulators, more cofactors involved in the crosstalk between ABA and other phytohormones, and visualization of active ABA in the plant), and outline future perspectives for ABA regulating seed associated traits.
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Affiliation(s)
- Faiza Ali
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, Zhengzhou University, Zhengzhou 450001, China
| | - Ghulam Qanmber
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, Zhengzhou University, Zhengzhou 450001, China
| | - Fuguang Li
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, Zhengzhou University, Zhengzhou 450001, China.,State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang 455000, China
| | - Zhi Wang
- Zhengzhou Research Base, State Key Laboratory of Cotton Biology, Zhengzhou University, Zhengzhou 450001, China.,State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang 455000, China
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18
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Jing XQ, Li WQ, Zhou MR, Shi PT, Zhang R, Shalmani A, Muhammad I, Wang GF, Liu WT, Chen KM. Rice Carbohydrate-Binding Malectin-Like Protein, OsCBM1, Contributes to Drought-Stress Tolerance by Participating in NADPH Oxidase-Mediated ROS Production. RICE (NEW YORK, N.Y.) 2021; 14:100. [PMID: 34874506 PMCID: PMC8651890 DOI: 10.1186/s12284-021-00541-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Accepted: 11/28/2021] [Indexed: 05/13/2023]
Abstract
Carbohydrate-binding malectin/malectin-like domain-containing proteins (CBMs) are a recently identified protein subfamily of lectins that participates various functional bioprocesses in the animal, bacterial, and plant kingdoms. However, little is known the roles of CBMs in rice development and stress response. In this study, OsCBM1, which encodes a protein containing only one malectin-like domain, was cloned and characterized. OsCBM1 is localized in both the endoplasmic reticulum and plasma membrane. Its transcripts are dominantly expressed in leaves and could be significantly stimulated by a number of phytohormone applications and abiotic stress treatments. Overexpression of OsCBM1 increased drought tolerance and reactive oxygen species production in rice, whereas the knockdown of the gene decreased them. OsCBM1 physically interacts with OsRbohA, a NADPH oxidase, and the expression of OsCBM1 in osrbohA, an OsRbohA-knockout mutant, is significantly downregulated under both normal growth and drought stress conditions. Meanwhile, OsCBM1 can also physically interacts with OsRacGEF1, a specific guanine nucleotide exchange factor for the Rop/Rac GTPase OsRac1, and transient coexpression of OsCBM1 with OaRacGEF1 significantly enhanced ROS production. Further transcriptome analysis showed that multiple signaling regulatory mechanisms are involved in the OsCBM1-mediated processes. All these results suggest that OsCBM1 participates in NADPH oxidase-mediated ROS production by interacting with OsRbohA and OsRacGEF1, contributing to drought stress tolerance of rice. Multiple signaling pathways are likely involved in the OsCBM1-mediated stress tolerance in rice.
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Affiliation(s)
- Xiu-Qing Jing
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
- Department of Biology, Taiyuan Normal University, Taiyuan, 030619 Shanxi China
| | - Wen-Qiang Li
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
| | - Meng-Ru Zhou
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
| | - Peng-Tao Shi
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
| | - Ran Zhang
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
| | - Abdullah Shalmani
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
| | - Izhar Muhammad
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
| | - Gang-Feng Wang
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
| | - Wen-Ting Liu
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
| | - Kun-Ming Chen
- State Key Laboratory of Crop Stress Biology in Arid Area, College of Life Sciences, Northwest A&F University, Yangling, 712100 Shaanxi China
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19
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Yang M, Han X, Yang J, Jiang Y, Hu Y. The Arabidopsis circadian clock protein PRR5 interacts with and stimulates ABI5 to modulate abscisic acid signaling during seed germination. THE PLANT CELL 2021; 33:3022-3041. [PMID: 34152411 PMCID: PMC8462813 DOI: 10.1093/plcell/koab168] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 06/17/2021] [Indexed: 05/03/2023]
Abstract
Seed germination and postgerminative growth require the precise coordination of multiple intrinsic and environmental signals. The phytohormone abscisic acid (ABA) suppresses these processes in Arabidopsis thaliana and the circadian clock contributes to the regulation of ABA signaling. However, the molecular mechanism underlying circadian clock-mediated ABA signaling remains largely unknown. Here, we found that the core circadian clock proteins PSEUDO-RESPONSE REGULATOR5 (PRR5) and PRR7 physically associate with ABSCISIC ACID-INSENSITIVE5 (ABI5), a crucial transcription factor of ABA signaling. PRR5 and PRR7 positively modulate ABA signaling redundantly during seed germination. Disrupting PRR5 and PRR7 simultaneously rendered germinating seeds hyposensitive to ABA, whereas the overexpression of PRR5 enhanced ABA signaling to inhibit seed germination. Consistent with this, the expression of several ABA-responsive genes is upregulated by PRR proteins. Genetic analysis demonstrated that PRR5 promotes ABA signaling mainly dependently on ABI5. Further mechanistic investigation revealed that PRR5 stimulates the transcriptional function of ABI5 without affecting its stability. Collectively, our results indicate that these PRR proteins function synergistically with ABI5 to activate ABA responses during seed germination, thus providing a mechanistic understanding of how ABA signaling and the circadian clock are directly integrated through a transcriptional complex involving ABI5 and central circadian clock components.
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Affiliation(s)
- Milian Yang
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiao Han
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
| | - Jiajia Yang
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanjuan Jiang
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
| | - Yanru Hu
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
- Author for correspondence:
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20
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Medicago ABI3 Splicing Isoforms Regulate the Expression of Different Gene Clusters to Orchestrate Seed Maturation. PLANTS 2021; 10:plants10081710. [PMID: 34451755 PMCID: PMC8398556 DOI: 10.3390/plants10081710] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 08/06/2021] [Accepted: 08/09/2021] [Indexed: 11/29/2022]
Abstract
Seed maturation comprises important developmental processes, such as seed filling and the acquisition of seed germination capacity, desiccation tolerance, longevity, and dormancy. The molecular regulation of these processes is tightly controlled by the LAFL transcription factors, among which ABSCISIC ACID INSENSITIVE 3 (ABI3) was shown to be involved in most of these seed maturation processes. Here, we studied the ABI3 gene from Medicago truncatula, a model legume plant for seed studies. With the transcriptomes of two loss-of-function Medicago abi3 mutants, we were able to show that many gene classes were impacted by the abi3 mutation at different stages of early, middle, and late seed maturation. We also discovered three MtABI3 expression isoforms, which present contrasting expression patterns during seed development. Moreover, by ectopically expressing these isoforms in Medicago hairy roots generated from the abi3 mutant line background, we showed that each isoform regulated specific gene clusters, suggesting divergent molecular functions. Furthermore, we complemented the Arabidopsis abi3 mutant with each of the three MtABI3 isoforms and concluded that all isoforms were capable of restoring seed viability and desiccation tolerance phenotypes even if not all isoforms complemented the seed color phenotype. Taken together, our results allow a better understanding of the ABI3 network in Medicago during seed development, as well as the discovery of commonly regulated genes from the three MtABI3 isoforms, which can give us new insights into how desiccation tolerance and seed viability are regulated.
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21
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Updates on the Role of ABSCISIC ACID INSENSITIVE 5 (ABI5) and ABSCISIC ACID-RESPONSIVE ELEMENT BINDING FACTORs (ABFs) in ABA Signaling in Different Developmental Stages in Plants. Cells 2021; 10:cells10081996. [PMID: 34440762 PMCID: PMC8394461 DOI: 10.3390/cells10081996] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 08/02/2021] [Accepted: 08/03/2021] [Indexed: 12/14/2022] Open
Abstract
The core abscisic acid (ABA) signaling pathway consists of receptors, phosphatases, kinases and transcription factors, among them ABA INSENSITIVE 5 (ABI5) and ABRE BINDING FACTORs/ABRE-BINDING PROTEINs (ABFs/AREBs), which belong to the BASIC LEUCINE ZIPPER (bZIP) family and control expression of stress-responsive genes. ABI5 is mostly active in seeds and prevents germination and post-germinative growth under unfavorable conditions. The activity of ABI5 is controlled at transcriptional and protein levels, depending on numerous regulators, including components of other phytohormonal pathways. ABFs/AREBs act redundantly in regulating genes that control physiological processes in response to stress during vegetative growth. In this review, we focus on recent reports regarding ABI5 and ABFs/AREBs functions during abiotic stress responses, which seem to be partially overlapping and not restricted to one developmental stage in Arabidopsis and other species. Moreover, we point out that ABI5 and ABFs/AREBs play a crucial role in the core ABA pathway’s feedback regulation. In this review, we also discuss increased stress tolerance of transgenic plants overexpressing genes encoding ABA-dependent bZIPs. Taken together, we show that ABI5 and ABFs/AREBs are crucial ABA-dependent transcription factors regulating processes essential for plant adaptation to stress at different developmental stages.
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22
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Cui W, Wang S, Han K, Zheng E, Ji M, Chen B, Wang X, Chen J, Yan F. Ferredoxin 1 is downregulated by the accumulation of abscisic acid in an ABI5-dependent manner to facilitate rice stripe virus infection in Nicotiana benthamiana and rice. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 107:1183-1197. [PMID: 34153146 DOI: 10.1111/tpj.15377] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 06/14/2021] [Indexed: 05/07/2023]
Abstract
Ferredoxin 1 (FD1) accepts and distributes electrons in the electron transfer chain of plants. Its expression is universally downregulated by viruses and its roles in plant immunity have been brought into focus over the past decade. However, the mechanism by which viruses regulate FD1 remains to be defined. In a previous report, we found that the expression of Nicotiana benthamiana FD1 (NbFD1) was downregulated following infection with potato virus X (PVX) and that NbFD1 regulates callose deposition at plasmodesmata to play a role in defense against PVX infection. We now report that NbFD1 is downregulated by rice stripe virus (RSV) infection and that silencing of NbFD1 also facilitates RSV infection, while viral infection was inhibited in a transgenic line overexpressing NbFD1, indicating that NbFD1 also functions in defense against RSV infection. Next, a RSV-derived small interfering RNA was identified that contributes to the downregulation of FD1 transcripts. Further analysis showed that the abscisic acid (ABA) which accumulates in RSV-infected plants also represses NbFD1 transcription. It does this by stimulating expression of ABA insensitive 5 (ABI5), which binds the ABA response element motifs in the NbFD1 promoter, resulting in negative regulation. Regulation of FD1 by ABA was also confirmed in RSV-infected plants of the natural host rice. The results therefore suggest a mechanism by which virus regulates chloroplast-related genes to suppress their defense roles.
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Affiliation(s)
- Weijun Cui
- College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Shu Wang
- Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Nebraska, NE 68583, USA
| | - Kelei Han
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
| | - Ersong Zheng
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Mengfei Ji
- College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
| | - Binghua Chen
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
| | - Xuming Wang
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Jianping Chen
- College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Fei Yan
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
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Li Q, Xu F, Chen Z, Teng Z, Sun K, Li X, Yu J, Zhang G, Liang Y, Huang X, Du L, Qian Y, Wang Y, Chu C, Tang J. Synergistic interplay of ABA and BR signal in regulating plant growth and adaptation. NATURE PLANTS 2021; 7:1108-1118. [PMID: 34226689 DOI: 10.1038/s41477-021-00959-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Accepted: 06/03/2021] [Indexed: 05/10/2023]
Abstract
Complex antagonistic interactions between abscisic acid (ABA) and brassinosteroid (BR) signalling pathways have been widely documented. However, whether or how ABA interacts synergistically with BR in plants remains to be elucidated. Here, we report that low, but not high, concentration of ABA increases lamina joint inclination of rice seedling, which requires functional BR biosynthesis and signalling. Transcriptome analyses confirm that about 60% of low-concentration ABA early response genes can be regulated by BR in the same directions. ABA activates BR signal in a fast, limited and short-term manner and the BR-biosynthesis regulatory gene, OsGSR1, plays a key role during this process, whose expression is induced slightly by ABA through transcriptional factor ABI3. Moreover, the early short-term BR signal activation is also important for ABA-mediated salt stress tolerance. Intriguingly, the process and effect of short-term BR signal activation were covered by high concentration of ABA, implying adaptive mechanisms existed in plants to cope with varying degrees of stress.
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Affiliation(s)
- Qianqian Li
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Fan Xu
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
| | - Zhuo Chen
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
| | - Zhenfeng Teng
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Kai Sun
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Xiancai Li
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
| | - Jianyuan Yu
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Guoxia Zhang
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
| | - Yan Liang
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Xiahe Huang
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Lin Du
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
| | | | - Yingchun Wang
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Chengcai Chu
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China.
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China.
| | - Jiuyou Tang
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, and the Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China.
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24
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Jia H, Suzuki M, McCarty DR. Structural variation affecting DNA backbone interactions underlies adaptation of B3 DNA binding domains to constraints imposed by protein architecture. Nucleic Acids Res 2021; 49:4989-5002. [PMID: 33872371 PMCID: PMC8136769 DOI: 10.1093/nar/gkab257] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 03/25/2021] [Accepted: 03/31/2021] [Indexed: 11/25/2022] Open
Abstract
Functional and architectural diversification of transcription factor families has played a central role in the independent evolution of complex development in plants and animals. Here, we investigate the role of architectural constraints on evolution of B3 DNA binding domains that regulate plant embryogenesis. B3 domains of ABI3, FUS3, LEC2 and VAL1 proteins recognize the same cis-element. Complex architectures of ABI3 and VAL1 integrate cis-element recognition with other signals, whereas LEC2 and FUS3 have reduced architectures conducive to roles as pioneer activators. In yeast and plant in vivo assays, B3 domain functions correlate with architectural complexity of the parent transcription factor rather than phylogenetic relatedness. In a complex architecture, attenuated ABI3-B3 and VAL1-B3 activities enable integration of cis-element recognition with hormone signaling, whereas hyper-active LEC2-B3 and FUS3-B3 over-ride hormonal control. Three clade-specific amino acid substitutions (β4-triad) implicated in interactions with the DNA backbone account for divergence of LEC2-B3 and ABI3-B3. We find a striking correlation between differences in in vitro DNA binding affinity and in vivo activities of B3 domains in plants and yeast. Our results highlight the role of DNA backbone interactions that preserve DNA sequence specificity in adaptation of B3 domains to functional constraints associated with domain architecture.
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Affiliation(s)
- Haiyan Jia
- Horticultural Sciences Department, Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL 32611-0690, USA
| | - Masaharu Suzuki
- Horticultural Sciences Department, Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL 32611-0690, USA
| | - Donald R McCarty
- Horticultural Sciences Department, Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL 32611-0690, USA
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25
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Guo C, Jiang Y, Shi M, Wu X, Wu G. ABI5 acts downstream of miR159 to delay vegetative phase change in Arabidopsis. THE NEW PHYTOLOGIST 2021; 231:339-350. [PMID: 33774835 DOI: 10.1111/nph.17371] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 03/20/2021] [Indexed: 05/14/2023]
Abstract
Vegetative development constitutes a critical phase in plant development, and it is regulated by an evolutionarily conserved miR156-SPL pathway. Previous studies have shown that miR159 acts to prevent the hyperactivation of miR156 to regulate the timing of vegetative phase change in Arabidopsis. However, whether miR159 integrates into the abscisic acid (ABA) signaling pathway to control vegetative phase change remains unexplored, since miR159 also plays an important regulatory role in ABA response. Here, we show that the expression of ABI5 (ABA INSENSITIVE5), a crucial regulator in the ABA signaling pathway, is significantly elevated in the loss-of-function mutant of miR159 (mir159ab). Loss of function in ABI5 (abi5) promotes juvenile-to-adult transition, whereas overexpression of ABI5 delays this transition under short-day conditions. Genetic analyses indicated that the effect of mir159ab on vegetative phase change is ABI5 dependent. Further analysis confirmed that MYB33, a major target of miR159, promotes the transcription of ABI5 by directly binding to its promoter. ABI5 functions upstream of miR156 to promote juvenile development by affecting the expression of genes in the miR156-SPL pathway. Therefore, our study uncovers a new role of ABI5 in vegetative development in plants, and implies a role of ABA signaling in vegetative development in Arabidopsis.
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Affiliation(s)
- Changkui Guo
- State Key Laboratory of Subtropical Silviculture, School of Agriculture and Food Sciences, Zhejiang Agriculture and Forestry University, Hangzhou, 311300, China
| | - Youqi Jiang
- State Key Laboratory of Subtropical Silviculture, School of Agriculture and Food Sciences, Zhejiang Agriculture and Forestry University, Hangzhou, 311300, China
| | - Min Shi
- State Key Laboratory of Subtropical Silviculture, School of Agriculture and Food Sciences, Zhejiang Agriculture and Forestry University, Hangzhou, 311300, China
| | - Xi Wu
- State Key Laboratory of Subtropical Silviculture, School of Agriculture and Food Sciences, Zhejiang Agriculture and Forestry University, Hangzhou, 311300, China
| | - Gang Wu
- State Key Laboratory of Subtropical Silviculture, School of Agriculture and Food Sciences, Zhejiang Agriculture and Forestry University, Hangzhou, 311300, China
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Fernandez‐Pozo N, Metz T, Chandler JO, Gramzow L, Mérai Z, Maumus F, Mittelsten Scheid O, Theißen G, Schranz ME, Leubner‐Metzger G, Rensing SA. Aethionema arabicum genome annotation using PacBio full-length transcripts provides a valuable resource for seed dormancy and Brassicaceae evolution research. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 106:275-293. [PMID: 33453123 PMCID: PMC8641386 DOI: 10.1111/tpj.15161] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 12/31/2020] [Accepted: 01/08/2021] [Indexed: 05/06/2023]
Abstract
Aethionema arabicum is an important model plant for Brassicaceae trait evolution, particularly of seed (development, regulation, germination, dormancy) and fruit (development, dehiscence mechanisms) characters. Its genome assembly was recently improved but the gene annotation was not updated. Here, we improved the Ae. arabicum gene annotation using 294 RNA-seq libraries and 136 307 full-length PacBio Iso-seq transcripts, increasing BUSCO completeness by 11.6% and featuring 5606 additional genes. Analysis of orthologs showed a lower number of genes in Ae. arabicum than in other Brassicaceae, which could be partially explained by loss of homeologs derived from the At-α polyploidization event and by a lower occurrence of tandem duplications after divergence of Aethionema from the other Brassicaceae. Benchmarking of MADS-box genes identified orthologs of FUL and AGL79 not found in previous versions. Analysis of full-length transcripts related to ABA-mediated seed dormancy discovered a conserved isoform of PIF6-β and antisense transcripts in ABI3, ABI4 and DOG1, among other cases found of different alternative splicing between Turkey and Cyprus ecotypes. The presented data allow alternative splicing mining and proposition of numerous hypotheses to research evolution and functional genomics. Annotation data and sequences are available at the Ae. arabicum DB (https://plantcode.online.uni-marburg.de/aetar_db).
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Affiliation(s)
- Noe Fernandez‐Pozo
- Plant Cell BiologyDepartment of BiologyUniversity of MarburgMarburgGermany
| | - Timo Metz
- Plant Cell BiologyDepartment of BiologyUniversity of MarburgMarburgGermany
| | - Jake O. Chandler
- School of Biological SciencesRoyal Holloway University of LondonEghamSurreyUK
| | - Lydia Gramzow
- Matthias Schleiden Institute/GeneticsFriedrich Schiller University JenaJenaGermany
| | - Zsuzsanna Mérai
- Gregor Mendel Institute of Molecular Plant BiologyAustrian Academy of SciencesVienna BioCenter (VBC)ViennaAustria
| | | | - Ortrun Mittelsten Scheid
- Gregor Mendel Institute of Molecular Plant BiologyAustrian Academy of SciencesVienna BioCenter (VBC)ViennaAustria
| | - Günter Theißen
- Matthias Schleiden Institute/GeneticsFriedrich Schiller University JenaJenaGermany
| | - M. Eric Schranz
- Biosystematics GroupWageningen UniversityWageningenThe Netherlands
| | - Gerhard Leubner‐Metzger
- School of Biological SciencesRoyal Holloway University of LondonEghamSurreyUK
- Laboratory of Growth RegulatorsCentre of the Region Haná for Biotechnological and Agricultural ResearchPalacký University and Institute of Experimental BotanyAcademy of Sciences of the Czech RepublicOlomoucCzech Republic
| | - Stefan A. Rensing
- Plant Cell BiologyDepartment of BiologyUniversity of MarburgMarburgGermany
- BIOSS Centre for Biological Signaling StudiesUniversity of FreiburgFreiburgGermany
- LOEWE Center for Synthetic Microbiology (SYNMIKRO)University of MarburgMarburgGermany
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Wang TJ, Huang S, Zhang A, Guo P, Liu Y, Xu C, Cong W, Liu B, Xu ZY. JMJ17-WRKY40 and HY5-ABI5 modules regulate the expression of ABA-responsive genes in Arabidopsis. THE NEW PHYTOLOGIST 2021; 230:567-584. [PMID: 33423315 DOI: 10.1111/nph.17177] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 12/25/2020] [Indexed: 05/09/2023]
Abstract
Abscisic acid (ABA) plays a crucial role in the adaptation of young seedlings to environmental stresses. However, the role of epigenetic components and core transcriptional machineries in the effect of ABA on seed germination and seedling growth remain unclear. Here, we show that a histone 3 lysine 4 (H3K4) demethylase, JMJ17, regulates the expression of ABA-responsive genes during seed germination and seedling growth. Using comparative interactomics, WRKY40, a central transcriptional repressor in ABA signaling, was shown to interact with JMJ17. WRKY40 facilitates the recruitment of JMJ17 to the ABI5 chromatin, which removes gene activation marks (H3K4me3) from the ABI5 chromatin, thereby repressing its expression. Additionally, WRKY40 represses the transcriptional activation activity of HY5, which can activate ABI5 expression by directly binding to its promoter. An increase in ABA concentrations decreases the affinity of WRKY40 for the ABI5 promoter. Thus, WRKY40 and JMJ17 are released from the ABI5 chromatin, activating HY5. The accumulated ABI5 protein further shows heteromeric interaction with HY5, and thus synergistically activates its own expression. Our findings reveal a novel transcriptional switch, composed of JMJ17-WRKY40 and HY5-ABI5 modules, which regulates the ABA response during seed germination and seedling development in Arabidopsis.
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Affiliation(s)
- Tian-Jing Wang
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Shuangzhan Huang
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Ai Zhang
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Peng Guo
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Yutong Liu
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Chunming Xu
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Weixuan Cong
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Bao Liu
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Zheng-Yi Xu
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
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28
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Manan S, Zhao J. Role of Glycine max ABSCISIC ACID INSENSITIVE 3 (GmABI3) in lipid biosynthesis and stress tolerance in soybean. FUNCTIONAL PLANT BIOLOGY : FPB 2021; 48:171-179. [PMID: 32877635 DOI: 10.1071/fp19260] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 08/13/2020] [Indexed: 05/27/2023]
Abstract
Soybean is an important oilseed crop and primary dietary protein resource. The limited understanding of soybean oil biosynthesis has become a significant obstacle for the improvement of soybean oil production. A transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3) is known for its role in plant development and seed dormancy in many crops. The current study was aimed to functionally characterise ABI3 homologue in Glycine max L. For this purpose, the GmABI3 gene was cloned and ectopically expressed in wildtype and abi3 mutant Arabidopsis. The GmABI3 expression in the atabi3 mutant enhanced the triacylglycerol (TAG) content (7.3%) in addition to modified fatty acid composition. The GmABI3 increased eicosenoic acid (20:1) up to 6.5% in genetically complemented Arabidopsis mutant seeds, which is essential for long-chain fatty acid synthesis. The transgenic GmABI3/wildtype seeds contain 34.9% more TAG content compared with wildtype seeds. The results showed that GmABI3 is responsible for seed-specific TAG and long-chain fatty acid biosynthesis in soybean. The exposure to cold and heat stress and exogenous supply of abscisic acid and jasmonic acid altered the level of GmABI3 in treated seeds and leaves. It also concluded that GmABI3 could regulate stress tolerance in soybean, which applies to a wide variety of crops to deal with biological stresses.
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Affiliation(s)
- Sehrish Manan
- National Key Laboratory of Crop Genetic Improvement, College of Plant Sciences and Technology, Huazhong Agricultural University, Wuhan 430070, PR China; and Corresponding authors. ;
| | - Jian Zhao
- National Key Laboratory of Crop Genetic Improvement, College of Plant Sciences and Technology, Huazhong Agricultural University, Wuhan 430070, PR China; and State Key Lab of Tea Plant Biology and Utilisation, College of Tea and Food Science and Technology, Anhui Agricultural University, Hefei, China; and Corresponding authors. ;
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29
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Wang J, Deng Q, Li Y, Yu Y, Liu X, Han Y, Luo X, Wu X, Ju L, Sun J, Liu A, Fang J. Transcription Factors Rc and OsVP1 Coordinately Regulate Preharvest Sprouting Tolerance in Red Pericarp Rice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:14748-14757. [PMID: 33264008 DOI: 10.1021/acs.jafc.0c04748] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Red pericarp associates with seed dormancy or preharvest sprouting (PHS) tolerance in crops. To identify this association's molecular mechanism, a PHS mutant Osviviparous1 (Osvp1) was characterized in rice and crossed with Kasalath, a red pericarp cultivar with Rc (red coleoptiles) genotype. Among the dehulled seeds of F2 progenies, RcRcvp1vp1 seeds performed a lower PHS rate than rcrcvp1vp1 seeds and showed shallower pigmentation than RcRcVP1VP1 seeds. Kasalath and SL9 (an RcRcVP1VP1 substitution line with Nipponbare background) showed more ABA sensitivity than the Nipponbare (rcrcVP1VP1) by the germination assay, and the transcriptional abundance of ABA signal genes OsABI2, OsSnRK2, OsVP1, ABI5, and especially OsVP1 increased in the red pericarp line SL9. Moreover, OsVP1 can directly bind Rc (bHLH) promoter by yeast one-hybrid, which activates Rc and OsLAR expression in red pericarp rice. Furthermore, a luciferase complementation imaging assay showed that OsVP1 interacts with transcriptions factors Rc and OsC1. These results indicate that OsVP1 promotes proanthocyanidin accumulation through the interaction among OsVP1, Rc, and OsC1 and then increases the plant's ABA sensitivity and PHS resistance.
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Affiliation(s)
- Jing Wang
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China
- Beverage Engineering Technology Research Center of Fruit-vegetables and Coarse Cereals of Heilongjiang Province, Qiqihar University, Qiqihar 161006, China
| | - Qianwen Deng
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China
- College of Life Science, Jiangxi Normal University, Nanchang 330022, China
| | - Yuhua Li
- College of Life Science, Northeast Forestry University, Harbin 150040, China
| | - Yang Yu
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China
- The Innovative Academy for Seed Design, Chinese Academy of Sciences, Beijing 100101, China
| | - Xin Liu
- Key Laboratory of Germplasm Enhancement, Physiology and Ecology of Food Crops in Cold Region, Ministry of Education, Northeast Agricultural University, Harbin 150030, China
| | - Yunfei Han
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China
- The Innovative Academy for Seed Design, Chinese Academy of Sciences, Beijing 100101, China
| | - Xiangdong Luo
- College of Life Science, Jiangxi Normal University, Nanchang 330022, China
| | - Xujiang Wu
- Institute of Agricultural Science of the Lixiahe District in Jiangsu Province, Yangzhou 225007, China
| | - Lan Ju
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Jiaqiang Sun
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Aihua Liu
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Jun Fang
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China
- The Innovative Academy for Seed Design, Chinese Academy of Sciences, Beijing 100101, China
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30
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Liu YH, Jiang M, Li RQ, Basnet R, Huang JZ, Song SY, Shu QY. Identification, Characterization, and Mutational Analysis of a Probable KEAP1 Ortholog in Rice ( Oryza sativa L.). PLANTS (BASEL, SWITZERLAND) 2020; 9:E1450. [PMID: 33121183 PMCID: PMC7716215 DOI: 10.3390/plants9111450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/23/2020] [Accepted: 10/23/2020] [Indexed: 01/07/2023]
Abstract
The Kelch-like ECH-associated protein 1 (KEAP1)-nuclear factor E2-related factor 2 (NRF2) module is a key component in the detoxification and antioxidant system in animals, which plays crucial roles in cell homeostasis and cytoprotection, and consequently in carcinogenesis and disease development. However, this system seems to have diverged throughout evolution across different organisms, and the question of whether a similar system exists in plants has thus far remained unresolved. In this study, a KEAP1 ortholog was identified in rice (Oryza sativa L., OsKEAP1) and its properties were characterized via in silico and laboratory studies. To reveal OsKEAP1's function, two knockdown mutants, oskeap1-1 and oskeap1-2, were generated by targeted mutagenesis in the 5' untranslated region (UTR) using the CRISPR-Cas9 system. In silico analysis showed that OsKEAP1 has a Kelch-repeat domain which is identical to those of animals and a plant-specific development and cell death (DCD) domain in place of the broad-complex, tramtrack, bric-a-brac (BTB) domain found in animals. Orthologs of OsKEAP1 are present across plant species and all have the DCD domain and the Kelch-repeat domain. OsKEAP1 was proven to be localized to both the cytoplasm and nucleus, in contrast to the exclusive cytoplasm localization of animal KEAP1. Single nucleotide insertions in the 5' UTR significantly reduced the transcription level of OsKEAP1 in the oskeap1-1 and oskeap1-2 mutants. The oskeap1 mutations greatly impaired plant growth and development, resulting in significant declines in a majority of agronomic and yield-related traits, i.e., plant height, panicle length, grain number per plant, and seed-set rate. The downregulation of OsKEAP1 increased the levels of H2O2, malondialdehyde, and proline while significantly decreasing the expression of two catalase genes in seedlings grown under normal and salt-stressed conditions. The changes in the above phenotypes are either positively or negatively correlated with the degree of OsKEAP1 downregulation. Altogether, we identified a probable KEAP1 ortholog in rice, revealed its unique subcellular localization, and demonstrated its important functions in vegetative and reproductive growth via regulation of the antioxidant response in plants.
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Affiliation(s)
- Yan-Hua Liu
- National Key Laboratory of Rice Biology and Zhejiang Key Laboratory of Crop Germplasm Resources, Institute of Crop Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-H.L.); (M.J.); (R.B.); (J.-Z.H.); (S.-Y.S.)
| | - Meng Jiang
- National Key Laboratory of Rice Biology and Zhejiang Key Laboratory of Crop Germplasm Resources, Institute of Crop Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-H.L.); (M.J.); (R.B.); (J.-Z.H.); (S.-Y.S.)
| | - Rui-Qing Li
- College of Agronomy, Anhui Agricultural University, Hefei 230036, China;
| | - Rasbin Basnet
- National Key Laboratory of Rice Biology and Zhejiang Key Laboratory of Crop Germplasm Resources, Institute of Crop Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-H.L.); (M.J.); (R.B.); (J.-Z.H.); (S.-Y.S.)
| | - Jian-Zhong Huang
- National Key Laboratory of Rice Biology and Zhejiang Key Laboratory of Crop Germplasm Resources, Institute of Crop Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-H.L.); (M.J.); (R.B.); (J.-Z.H.); (S.-Y.S.)
- Key Laboratory for Nuclear Agricultural Sciences of Zhejiang Province and Ministry of Agriculture and Rural Affairs, Institute of Nuclear Agricultural Sciences, Zhejiang University, Zijingang Campus, Hangzhou 310058, China
| | - Shi-Yong Song
- National Key Laboratory of Rice Biology and Zhejiang Key Laboratory of Crop Germplasm Resources, Institute of Crop Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-H.L.); (M.J.); (R.B.); (J.-Z.H.); (S.-Y.S.)
| | - Qing-Yao Shu
- National Key Laboratory of Rice Biology and Zhejiang Key Laboratory of Crop Germplasm Resources, Institute of Crop Sciences, Zhejiang University, Hangzhou 310058, China; (Y.-H.L.); (M.J.); (R.B.); (J.-Z.H.); (S.-Y.S.)
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Wang Q, Yu F, Xie Q. Balancing growth and adaptation to stress: Crosstalk between brassinosteroid and abscisic acid signaling. PLANT, CELL & ENVIRONMENT 2020; 43:2325-2335. [PMID: 32671865 DOI: 10.1111/pce.13846] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 06/30/2020] [Accepted: 07/09/2020] [Indexed: 05/07/2023]
Abstract
Plant growth and development are plastic and canadapt to environmental changes. In this process different plant hormones coordinate to modulate plant growth and environmental interactions. In this article, we describe the individual brassinosteroid (BR) and abscisic acid (ABA) signaling pathways, emphasize the specific regulatory mechanisms between ABA and BR responses and discuss how both phytohormones coordinate growth, development and stress responses in plants. BR signaling is essential for plant development, while ABA signaling is activated to ensure plants survive stress. The crosstalk between BR and ABA, especially protein phosphorylation, protein stability control and downstream transcription control of key components of both pathways are discussed in terms of modulating plant development and stress adaptation.
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Affiliation(s)
- Qian Wang
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Feifei Yu
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
| | - Qi Xie
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
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32
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Tian R, Wang F, Zheng Q, Niza VMAGE, Downie AB, Perry SE. Direct and indirect targets of the arabidopsis seed transcription factor ABSCISIC ACID INSENSITIVE3. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 103:1679-1694. [PMID: 32445409 DOI: 10.1111/tpj.14854] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 05/09/2020] [Accepted: 05/15/2020] [Indexed: 05/04/2023]
Abstract
Arabidopsis thaliana ABSCISIC ACID INSENSITIVE3 (ABI3) is a transcription factor in the B3 domain family. ABI3, along with B3 domain transcription factors LEAFY COTYLEDON2 (LEC2) and FUSCA3 (FUS3), and LEC1, a subunit of the CCAAT box-binding complex, form the so-called LAFL network to control various aspects of seed development and maturation. ABI3 also contributes to the abscisic acid (ABA) response. We report on chromatin immunoprecipitation-tiling array experiments to map binding sites for ABI3 globally. We also assessed transcriptomes in response to ABI3 by comparing developing abi3-5 and wild-type seeds and combined this information to ascertain direct and indirect responsive ABI3 target genes. ABI3 can induce and repress its transcription of target genes directly and some intriguing differences exist in cis motifs between these groups of genes. Directly regulated targets reflect the role of ABI3 in seed maturation, desiccation tolerance, entry into a quiescent state and longevity. Interestingly, ABI3 directly represses a gene encoding a microRNA (MIR160B) that targets AUXIN RESPONSE FACTOR (ARF)10 and ARF16 that are involved in establishment of dormancy. In addition, ABI3, like FUS3, regulates genes encoding MIR156 but while FUS3 only induces genes encoding this product, ABI3 induces these genes during the early stages of seed development, but represses these genes during late development. The interplay between ABI3, the other LAFL genes, and the VP1/ABI3-LIKE (VAL) genes, which are involved in the transition to seedling development are examined and reveal complex interactions controlling development.
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Affiliation(s)
- Ran Tian
- UK Seed Biology Group, Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY, 40546-0312, USA
| | - Fangfang Wang
- UK Seed Biology Group, Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY, 40546-0312, USA
| | - Qiaolin Zheng
- UK Seed Biology Group, Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY, 40546-0312, USA
| | - Venus M A G E Niza
- UK Seed Biology Group, Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY, 40546-0312, USA
| | - A Bruce Downie
- UK Seed Biology Group, Department of Horticulture, University of Kentucky, Lexington, KY, 40546-0312, USA
| | - Sharyn E Perry
- UK Seed Biology Group, Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY, 40546-0312, USA
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Chandrasekaran U, Luo X, Zhou W, Shu K. Multifaceted Signaling Networks Mediated by Abscisic Acid Insensitive 4. PLANT COMMUNICATIONS 2020; 1:100040. [PMID: 33367237 PMCID: PMC7748004 DOI: 10.1016/j.xplc.2020.100040] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 12/24/2019] [Accepted: 03/04/2020] [Indexed: 05/04/2023]
Abstract
Although ABSCISIC ACID INSENSITIVE 4 (ABI4) was initially demonstrated as a key positive regulator in the phytohormone abscisic acid (ABA) signaling cascade, multiple studies have now shown that it is actually involved in the regulation of several other cascades, including diverse phytohormone biogenesis and signaling pathways, various developmental processes (such as seed dormancy and germination, seedling establishment, and root development), disease resistance and lipid metabolism. Consistent with its versatile biological functions, ABI4 either activates or represses transcription of its target genes. The upstream regulators of ABI4 at both the transcription and post-transcription levels have also been documented in recent years. Consequently, a complicated network consisting of the direct target genes and upstream regulators of ABI4, through which ABI4 participates in several phytohormone crosstalk networks, has been generated. In this review, we summarize current understanding of the sophisticated ABI4-mediated molecular networks, mainly focusing on diverse phytohormone (including ABA, gibberellin, cytokinin, ethylene, auxin, and jasmonic acid) crosstalks. We also discuss the potential mechanisms through which ABI4 receives the ABA signal, focusing on protein phosphorylation modification events.
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Affiliation(s)
| | - Xiaofeng Luo
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an 710012, China
- Institute of Ecological Agriculture, Sichuan Agricultural University, Chengdu 611130, China
| | - Wenguan Zhou
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an 710012, China
| | - Kai Shu
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an 710012, China
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Cadavid IC, Guzman F, de Oliveira-Busatto L, de Almeida RMC, Margis R. Transcriptional analyses of two soybean cultivars under salt stress. Mol Biol Rep 2020; 47:2871-2888. [PMID: 32227253 DOI: 10.1007/s11033-020-05398-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 03/25/2020] [Indexed: 01/12/2023]
Abstract
Soybean is an economically important plant, and its production is affected in soils with high salinity levels. It is important to understand the adaptive mechanisms through which plants overcome this kind of stress and to identify potential genes for improving abiotic stress tolerance. RNA-Seq data of two Glycine max cultivars, a drought-sensitive (C08) and a tolerant (Conquista), subjected to different periods of salt stress were analyzed. The transcript expression profile was obtained using a transcriptogram approach, comparing both cultivars and different times of treatment. After 4 h of salt stress, Conquista cultivar had 1400 differentially expressed genes, 647 induced and 753 repressed. Comparative expression revealed that 719 genes share the same pattern of induction or repression between both cultivars. Among them, 393 genes were up- and 326 down-regulated. Salt stress also modified the expression of 54 isoforms of miRNAs in Conquista, by the maturation of 39 different pre-miRNAs. The predicted targets for 12 of those mature miRNAs also have matches with 15 differentially expressed genes from our analyses. We found genes involved in important pathways related to stress adaptation. Genes from both ABA and BR signaling pathways were modulated, with possible crosstalk between them, and with a likely post-transcriptional regulation by miRNAs. Genes related to ethylene biosynthesis, DNA repair, and plastid translation process were those that could be regulated by miRNA.
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Affiliation(s)
- Isabel Cristina Cadavid
- Progama de Pos-gradação em Biologia Celular e Molecular (PPGBCM), Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Frank Guzman
- Progama de Pos-gradação em Biologia Celular e Molecular (PPGBCM), Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Dirección de Recursos Genéticos y Biotecnología, Instituto Nacional de Innovación Agraria, Av. La Molina, 1981, Lima 12, Perú
| | - Luisa de Oliveira-Busatto
- Progama de Pos-gradação em Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Rita M C de Almeida
- Instituto de Física, Sistemas Complexos, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Instituto Nacional de Ciência E Tecnologia: Sistemas Complexos, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Programa de Pós Graduação Em Bioinformática, Universidade Federal do Rio Grande do Norte, Natal, Brazil
| | - Rogerio Margis
- Progama de Pos-gradação em Biologia Celular e Molecular (PPGBCM), Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
- Progama de Pos-gradação em Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
- Centro de Biotecnologia, Laboratório de Genomas e Populações de Plantas (LGPP), Universidade Federal Do Rio Grande Do Sul, Av. Bento Gonçalves, 9500 - Prédio 43422, Laboratório 206, Porto Alegre, Brazil.
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Shah FA, Wei X, Wang Q, Liu W, Wang D, Yao Y, Hu H, Chen X, Huang S, Hou J, Lu R, Liu C, Ni J, Wu L. Karrikin Improves Osmotic and Salt Stress Tolerance via the Regulation of the Redox Homeostasis in the Oil Plant Sapium sebiferum. FRONTIERS IN PLANT SCIENCE 2020; 11:216. [PMID: 32265947 PMCID: PMC7105677 DOI: 10.3389/fpls.2020.00216] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 02/12/2020] [Indexed: 05/05/2023]
Abstract
Karrikins are reported to stimulate seed germination, regulate seedling growth, and increase the seedling vigor in abiotic stress conditions in plants. Nevertheless, how karrikins alleviate abiotic stress remains largely elusive. In this study, we found that karrikin (KAR1) could significantly alleviate both drought and salt stress in the important oil plant Sapium sebiferum. KAR1 supplementation in growth medium at a nanomolar (nM) concentration was enough to recover seed germination under salt and osmotic stress conditions. One nanomolar of KAR1 improved seedling biomass, increased the taproot length, and increased the number of lateral roots under abiotic stresses, suggesting that KAR1 is a potent alleviator of abiotic stresses in plants. Under abiotic stresses, KAR1-treated seedlings had a higher activity of the key antioxidative enzymes, such as superoxide dismutase, peroxidase, catalase, and ascorbate peroxidase, in comparison with the control, which leads to a lower level of hydrogen peroxide, malondialdehyde, and electrolyte leakage. Moreover, the metabolome analysis showed that KAR1 treatment significantly increased the level of organic acids and amino acids, which played important roles in redox homeostasis under stresses, suggesting that karrikins might alleviate abiotic stresses via the regulation of redox homeostasis. Under abiotic stresses, applications of karrikins did not increase the endogenous abscisic acid level but altered the expression of several ABA signaling genes, such as SNF1-RELATED PROTEIN KINASE2.3, SNF1-RELATED PROTEIN KINASE2.6, ABI3, and ABI5, suggesting potential interactions between karrikins and ABA signaling in the stress responses. Conclusively, we not only provided the physiological and molecular evidence to clarify the mechanism of karrikins in the regulation of stress adaptation in S. sebiferum but also showed the potential value of karrikins in agricultural practices, which will lay a foundation for further studies about the role of karrikins in abiotic stress alleviation in plants.
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Affiliation(s)
- Faheem Afzal Shah
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Xiao Wei
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Qiaojian Wang
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Wenbo Liu
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Dongdong Wang
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Yuanyuan Yao
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Hao Hu
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Xue Chen
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Shengwei Huang
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Jinyan Hou
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Ruiju Lu
- Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Chenghong Liu
- Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Jun Ni
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Lifang Wu
- Key Laboratory of the High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
- Taihe Experimental Station, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Taihe, China
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Lyall R, Schlebusch SA, Proctor J, Prag M, Hussey SG, Ingle RA, Illing N. Vegetative desiccation tolerance in the resurrection plant Xerophyta humilis has not evolved through reactivation of the seed canonical LAFL regulatory network. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 101:1349-1367. [PMID: 31680354 PMCID: PMC7187197 DOI: 10.1111/tpj.14596] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 10/09/2019] [Accepted: 10/21/2019] [Indexed: 05/25/2023]
Abstract
It has been hypothesised that vegetative desiccation tolerance in resurrection plants evolved via reactivation of the canonical LAFL (i.e. LEC1, ABI3, FUS3 and LEC2) transcription factor (TF) network that activates the expression of genes during the maturation of orthodox seeds leading to desiccation tolerance of the plant embryo in most angiosperms. There is little direct evidence to support this, however, and the transcriptional changes that occur during seed maturation in resurrection plants have not previously been studied. Here we performed de novo transcriptome assembly for Xerophyta humilis, and analysed gene expression during seed maturation and vegetative desiccation. Our results indicate that differential expression of a set of 4205 genes is common to maturing seeds and desiccating leaves. This shared set of genes is enriched for gene ontology terms related to abiotic stress, including water stress and abscisic acid signalling, and includes many genes that are seed-specific in Arabidopsis thaliana and targets of ABI3. However, while we observed upregulation of orthologues of the canonical LAFL TFs and ABI5 during seed maturation, similar to what is seen in A. thaliana, this did not occur during desiccation of leaf tissue. Thus, reactivation of components of the seed desiccation program in X. humilis vegetative tissues likely involves alternative transcriptional regulators.
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Affiliation(s)
- Rafe Lyall
- Department of Molecular and Cell BiologyUniversity of Cape TownRondebosch7701South Africa
| | - Stephen A. Schlebusch
- Department of Molecular and Cell BiologyUniversity of Cape TownRondebosch7701South Africa
| | - Jessica Proctor
- Department of Molecular and Cell BiologyUniversity of Cape TownRondebosch7701South Africa
| | - Mayur Prag
- Department of Molecular and Cell BiologyUniversity of Cape TownRondebosch7701South Africa
| | - Steven G. Hussey
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI)University of PretoriaPretoria0002South Africa
| | - Robert A. Ingle
- Department of Molecular and Cell BiologyUniversity of Cape TownRondebosch7701South Africa
| | - Nicola Illing
- Department of Molecular and Cell BiologyUniversity of Cape TownRondebosch7701South Africa
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Utsugi S, Ashikawa I, Nakamura S, Shibasaka M. TaABI5, a wheat homolog of Arabidopsis thaliana ABA insensitive 5, controls seed germination. JOURNAL OF PLANT RESEARCH 2020; 133:245-256. [PMID: 32048094 DOI: 10.1007/s10265-020-01166-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 01/20/2020] [Indexed: 05/25/2023]
Abstract
Abscisic acid (ABA) response element (ABRE)-binding factors (ABFs) are basic region/leucine zipper motif (bZIP) transcription factors that regulate the expression of ABA-induced genes containing ABRE in their promoters. The amino acid sequence of the wheat bZIP protein, TaABI5, showed high homology to that of Arabidopsis ABA insensitive 5 (ABI5). TaABI5 was classified into the clade of ABI5s in Arabidopsis and rice, unlike TRAB1 of rice, Wabi5 of wheat, and HvABI5 of barley in the bZIP Group A family, by a phylogenetic analysis. TaABI5 was strongly expressed in seeds during the late ripening and maturing stages; however, its expression level markedly decreased after germination. An in situ hybridization analysis showed that TaABI5 mRNA accumulated in seed embryos, particularly the scutellum. In a transient assay using wheat aleurone cells, TaABI5 activated the promoter of Em containing ABRE, which is an embryogenesis abundant protein gene, indicating that TaABI5 acts as a transcription factor in wheat seeds. Furthermore, the seeds of transgenic Arabidopsis lines introduced with 35S:TaABI5 exhibited high sensitivity to ABA and the inhibition of germination. The seed dormancy of the transgenic Arabidopsis lines was stronger than that of Col. These results support TaABI5 playing an important role in mature seeds, particularly before seed germination, and acting as a functional ortholog to Arabidopsis ABI5.
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Affiliation(s)
- Shigeko Utsugi
- Institute of Plant Science and Resources (IPSR), Okayama University, 2-20-1 Chuo, Kurashiki, Okayama, 710-0046, Japan.
| | - Ikuo Ashikawa
- Institute of Crop Science, NARO, 2-1-2 Kannonndai, Tsukuba, Ibaraki, 305-8518, Japan
| | - Shingo Nakamura
- Institute of Crop Science, NARO, 2-1-2 Kannonndai, Tsukuba, Ibaraki, 305-8518, Japan
| | - Mineo Shibasaka
- Institute of Plant Science and Resources (IPSR), Okayama University, 2-20-1 Chuo, Kurashiki, Okayama, 710-0046, Japan
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38
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Jo L, Pelletier JM, Hsu SW, Baden R, Goldberg RB, Harada JJ. Combinatorial interactions of the LEC1 transcription factor specify diverse developmental programs during soybean seed development. Proc Natl Acad Sci U S A 2020; 117:1223-1232. [PMID: 31892538 PMCID: PMC6969526 DOI: 10.1073/pnas.1918441117] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The LEAFY COTYLEDON1 (LEC1) transcription factor is a central regulator of seed development, because it controls diverse biological programs during seed development, such as embryo morphogenesis, photosynthesis, and seed maturation. To understand how LEC1 regulates different gene sets during development, we explored the possibility that LEC1 acts in combination with other transcription factors. We identified and compared genes that are directly transcriptionally regulated by ABA-RESPONSIVE ELEMENT BINDING PROTEIN3 (AREB3), BASIC LEUCINE ZIPPER67 (bZIP67), and ABA INSENSITIVE3 (ABI3) with those regulated by LEC1. We showed that LEC1 operates with specific sets of transcription factors to regulate different gene sets and, therefore, distinct developmental processes. Thus, LEC1 controls diverse processes through its combinatorial interactions with other transcription factors. DNA binding sites for the transcription factors are closely clustered in genomic regions upstream of target genes, defining cis-regulatory modules that are enriched for DNA sequence motifs that resemble sequences known to be bound by these transcription factors. Moreover, cis-regulatory modules for genes regulated by distinct transcription factor combinations are enriched for different sets of DNA motifs. Expression assays with embryo cells indicate that the enriched DNA motifs are functional cis elements that regulate transcription. Together, the results suggest that combinatorial interactions between LEC1 and other transcription factors are mediated by cis-regulatory modules containing clustered cis elements and by physical interactions that are documented to occur between the transcription factors.
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Affiliation(s)
- Leonardo Jo
- Department of Plant Biology, University of California, Davis, CA 95616
| | - Julie M Pelletier
- Department of Plant Biology, University of California, Davis, CA 95616
| | - Ssu-Wei Hsu
- Department of Plant Biology, University of California, Davis, CA 95616
| | - Russell Baden
- Department of Plant Biology, University of California, Davis, CA 95616
| | - Robert B Goldberg
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, CA 90095
| | - John J Harada
- Department of Plant Biology, University of California, Davis, CA 95616;
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Kroll CK, Brenner WG. Cytokinin Signaling Downstream of the His-Asp Phosphorelay Network: Cytokinin-Regulated Genes and Their Functions. FRONTIERS IN PLANT SCIENCE 2020; 11:604489. [PMID: 33329676 PMCID: PMC7718014 DOI: 10.3389/fpls.2020.604489] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 10/26/2020] [Indexed: 05/17/2023]
Abstract
The plant hormone cytokinin, existing in several molecular forms, is perceived by membrane-localized histidine kinases. The signal is transduced to transcription factors of the type-B response regulator family localized in the nucleus by a multi-step histidine-aspartate phosphorelay network employing histidine phosphotransmitters as shuttle proteins across the nuclear envelope. The type-B response regulators activate a number of primary response genes, some of which trigger in turn further signaling events and the expression of secondary response genes. Most genes activated in both rounds of transcription were identified with high confidence using different transcriptomic toolkits and meta analyses of multiple individual published datasets. In this review, we attempt to summarize the existing knowledge about the primary and secondary cytokinin response genes in order to try connecting gene expression with the multitude of effects that cytokinin exerts within the plant body and throughout the lifespan of a plant.
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40
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Chen K, Li GJ, Bressan RA, Song CP, Zhu JK, Zhao Y. Abscisic acid dynamics, signaling, and functions in plants. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2020; 62:25-54. [PMID: 31850654 DOI: 10.1111/jipb.12899] [Citation(s) in RCA: 591] [Impact Index Per Article: 147.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 12/16/2019] [Indexed: 05/18/2023]
Abstract
Abscisic acid (ABA) is an important phytohormone regulating plant growth, development, and stress responses. It has an essential role in multiple physiological processes of plants, such as stomatal closure, cuticular wax accumulation, leaf senescence, bud dormancy, seed germination, osmotic regulation, and growth inhibition among many others. Abscisic acid controls downstream responses to abiotic and biotic environmental changes through both transcriptional and posttranscriptional mechanisms. During the past 20 years, ABA biosynthesis and many of its signaling pathways have been well characterized. Here we review the dynamics of ABA metabolic pools and signaling that affects many of its physiological functions.
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Affiliation(s)
- Kong Chen
- Shanghai Center for Plant Stress Biology and CAS Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Guo-Jun Li
- Shanghai Center for Plant Stress Biology and CAS Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ray A Bressan
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, 47907, USA
| | - Chun-Peng Song
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, 475001, China
| | - Jian-Kang Zhu
- Shanghai Center for Plant Stress Biology and CAS Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, 47907, USA
| | - Yang Zhao
- Shanghai Center for Plant Stress Biology and CAS Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, 475001, China
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Baek D, Shin G, Kim MC, Shen M, Lee SY, Yun DJ. Histone Deacetylase HDA9 With ABI4 Contributes to Abscisic Acid Homeostasis in Drought Stress Response. FRONTIERS IN PLANT SCIENCE 2020; 11:143. [PMID: 32158458 PMCID: PMC7052305 DOI: 10.3389/fpls.2020.00143] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 01/30/2020] [Indexed: 05/18/2023]
Abstract
Drought stress, a major environmental factor, significantly affects plant growth and reproduction. Plants have evolved complex molecular mechanisms to tolerate drought stress. In this study, we investigated the function of the Arabidopsis thaliana RPD3-type HISTONE DEACETYLASE 9 (HDA9) in response to drought stress. The loss-of-function mutants hda9-1 and hda9-2 were insensitive to abscisic acid (ABA) and sensitive to drought stress. The ABA content in the hda9-1 mutant was reduced in wild type (WT) plant. Most histone deacetylases in animals and plants form complexes with other chromatin-remodeling components, such as transcription factors. In this study, we found that HDA9 interacts with the ABA INSENSITIVE 4 (ABI4) transcription factor using a yeast two-hybrid assay and coimmunoprecipitation. The expression of CYP707A1 and CYP707A2, which encode (+)-ABA 8'-hydroxylases, key enzymes in ABA catabolic pathways, was highly induced in hda9-1, hda9-2, abi4, and hda9-1 abi4 mutants upon drought stress. Chromatin immunoprecipitation and quantitative PCR showed that the HDA9 and ABI4 complex repressed the expression of CYP707A1 and CYP707A2 by directly binding to their promoters in response to drought stress. Taken together, these data suggest that HDA9 and ABI4 form a repressive complex to regulate the expression of CYP707A1 and CYP707A2 in response to drought stress in Arabidopsis.
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Affiliation(s)
- Dongwon Baek
- Division of Applied Life Science (BK21plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, South Korea
| | - Gilok Shin
- Department of Biomedical Science and Engineering, Konkuk University, Seoul, South Korea
| | - Min Chul Kim
- Division of Applied Life Science (BK21plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, South Korea
- Institute of Agriculture & Life Science, Gyeongsang National University, Jinju, South Korea
| | - Mingzhe Shen
- Division of Applied Life Science (BK21plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, South Korea
| | - Sang Yeol Lee
- Division of Applied Life Science (BK21plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, South Korea
| | - Dae-Jin Yun
- Department of Biomedical Science and Engineering, Konkuk University, Seoul, South Korea
- *Correspondence: Dae-Jin Yun,
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Collin A, Daszkowska-Golec A, Kurowska M, Szarejko I. Barley ABI5 ( Abscisic Acid INSENSITIVE 5) Is Involved in Abscisic Acid-Dependent Drought Response. FRONTIERS IN PLANT SCIENCE 2020; 11:1138. [PMID: 32849699 PMCID: PMC7405899 DOI: 10.3389/fpls.2020.01138] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 07/14/2020] [Indexed: 05/18/2023]
Abstract
ABA INSENSITIVE 5 (ABI5) is a basic leucine zipper (bZIP) transcription factor which acts in the abscisic acid (ABA) network and is activated in response to abiotic stresses. However, the precise role of barley (Hordeum vulgare) ABI5 in ABA signaling and its function under stress remains elusive. Here, we show that HvABI5 is involved in ABA-dependent regulation of barley response to drought stress. We identified barley TILLING mutants carrying different alleles in the HvABI5 gene and we studied in detail the physiological and molecular response to drought and ABA for one of them. The hvabi5.d mutant, carrying G1751A transition, was insensitive to ABA during seed germination, yet it showed the ability to store more water than its parent cv. "Sebastian" (WT) in response to drought stress. The drought-tolerant phenotype of hvabi5.d was associated with better membrane protection, higher flavonoid content, and faster stomatal closure in the mutant under stress compared to the WT. The microarray transcriptome analysis revealed up-regulation of genes associated with cell protection mechanisms in the mutant. Furthermore, HvABI5 target genes: HVA1 and HVA22 showed higher activity after drought, which may imply better adaptation of hvabi5.d to stress. On the other hand, chlorophyll content in hvabi5.d was lower than in WT, which was associated with decreased photosynthesis efficiency observed in the mutant after drought treatment. To verify that HvABI5 acts in the ABA-dependent manner we analyzed expression of selected genes related to ABA pathway in hvabi5.d and its WT parent after drought and ABA treatments. The expression of key genes involved in ABA metabolism and signaling differed in the mutant and the WT under stress. Drought-induced increase of expression of HvNCED1, HvBG8, HvSnRK2.1, and HvPP2C4 genes was 2-20 times higher in hvabi5.d compared to "Sebastian". We also observed a faster stomatal closure in hvabi5.d and much higher induction of HvNCED1 and HvSnRK2.1 genes after ABA treatment. Together, these findings demonstrate that HvABI5 plays a role in regulation of drought response in barley and suggest that HvABI5 might be engaged in the fine tuning of ABA signaling by a feedback regulation between biosynthetic and signaling events. In addition, they point to different mechanisms of HvABI5 action in regulating drought response and seed germination in barley.
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Zhang H, Liu D, Yang B, Liu WZ, Mu B, Song H, Chen B, Li Y, Ren D, Deng H, Jiang YQ. Arabidopsis CPK6 positively regulates ABA signaling and drought tolerance through phosphorylating ABA-responsive element-binding factors. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:188-203. [PMID: 31563949 DOI: 10.1093/jxb/erz432] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 09/11/2019] [Indexed: 06/10/2023]
Abstract
Abscisic acid (ABA) regulates numerous developmental processes and drought tolerance in plants. Calcium-dependent protein kinases (CPKs) are important Ca2+ sensors playing crucial roles in plant growth and development as well as responses to stresses. However, the molecular mechanisms of many CPKs in ABA signaling and drought tolerance remain largely unknown. Here we combined protein interaction studies, and biochemical and genetic approaches to identify and characterize substrates that were phosphorylated by CPK6 and elucidated the mechanism that underlines the role of CPK6 in ABA signaling and drought tolerance. The expression of CPK6 is induced by ABA and dehydration. Two cpk6 T-DNA insertion mutants are insensitive to ABA during seed germination and root elongation of seedlings; in contrast, overexpression of CPK6 showed the opposite phenotype. Moreover, CPK6-overexpressing lines showed enhanced drought tolerance. CPK6 interacts with and phosphorylates a subset of core ABA signaling-related transcription factors, ABA-responsive element-binding factors (ABFs/AREBs), and enhances their transcriptional activities. The phosphorylation sites in ABF3 and ABI5 were also identified through MS and mutational analyses. Taken together, we present evidence that CPK6 mediates ABA signaling and drought tolerance through phosphorylating ABFs/AREBs. This work thus uncovers a rather conserved mechanism of calcium-dependent Ser/Thr kinases in ABA signaling.
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Affiliation(s)
- Hanfeng Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, China
| | - Daoyin Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, China
| | - Bo Yang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, China
| | - Wu-Zhen Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, China
| | - Bangbang Mu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, China
| | - Huaxin Song
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, China
| | - Bingyou Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, China
| | - Yuan Li
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Dongtao Ren
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Hanqing Deng
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, China
| | - Yuan-Qing Jiang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi, China
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Mukherjee A, Mazumder M, Jana J, Srivastava AK, Mondal B, De A, Ghosh S, Saha U, Bose R, Chatterjee S, Dey N, Basu D. Enhancement of ABA Sensitivity Through Conditional Expression of the ARF10 Gene in Brassica juncea Reveals Fertile Plants with Tolerance Against Alternaria brassicicola. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2019; 32:1429-1447. [PMID: 31184524 DOI: 10.1094/mpmi-05-19-0132-r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Concomitant increase of auxin-responsive factors ARF16 and ARF17, along with enhanced expression of ARF10 in resistant Sinapis alba compared with that in susceptible Brassica juncea upon challenge with Alternaria brassicicola, revealed that abscisic acid (ABA)-auxin crosstalk is a critical factor for resistance response. Here, we induced the ABA response through conditional expression of ARF10 in B. juncea using the A. brassicicola-inducible GH3.3 promoter. Induced ABA sensitivity caused by conditional expression of ARF10 in transgenic B. juncea resulted in tolerance against A. brassicicola and led to enhanced expression of several ABA-responsive genes without affecting the auxin biosynthetic gene expression. Compared with ABI3 and ABI4, ABI5 showed maximum upregulation in the most tolerant transgenic lines upon pathogen challenge. Moreover, elevated expression of ARF10 by different means revealed a direct correlation between ARF10 expression and the induction of ABI5 protein in B. juncea. Through in vitro DNA-protein experiments and chromosome immunoprecipitation using the ARF10 antibody, we demonstrated that ARF10 interacts with the auxin-responsive elements of the ABI5 promoter. This suggests that ARF10 may function as a modulator of ABI5 to induce ABA sensitivity and mediate the resistance response against A. brassicicola.
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Affiliation(s)
- Amrita Mukherjee
- Division of Plant Biology, Bose Institute, Centenary Campus P-1/12 C.I.T., Scheme-VIIM Kolkata, 700054, West Bengal, India
| | - Mrinmoy Mazumder
- Division of Plant Biology, Bose Institute, Centenary Campus P-1/12 C.I.T., Scheme-VIIM Kolkata, 700054, West Bengal, India
| | - Jagannath Jana
- Division of Plant Biology, Bose Institute, Centenary Campus P-1/12 C.I.T., Scheme-VIIM Kolkata, 700054, West Bengal, India
- Institut Curie, CNRS UMR 3348, Orsay, France
| | - Archana Kumari Srivastava
- Plant and Microbial biotechnology, Institute of Life Sciences (ILS), NALCO Square, Bhubaneswar, 751023, Odisha, India
| | - Banani Mondal
- Division of Plant Biology, Bose Institute, Centenary Campus P-1/12 C.I.T., Scheme-VIIM Kolkata, 700054, West Bengal, India
| | - Aishee De
- Division of Plant Biology, Bose Institute, Centenary Campus P-1/12 C.I.T., Scheme-VIIM Kolkata, 700054, West Bengal, India
| | - Swagata Ghosh
- Division of Plant Biology, Bose Institute, Centenary Campus P-1/12 C.I.T., Scheme-VIIM Kolkata, 700054, West Bengal, India
| | - Upala Saha
- Division of Plant Biology, Bose Institute, Centenary Campus P-1/12 C.I.T., Scheme-VIIM Kolkata, 700054, West Bengal, India
- Department of Botany, Sister Nivedita Government General Degree College for Girls, 20B Judge's Court Road, Hastings House, Alipore, Kolkata, 700027, West Bengal, India
| | - Rahul Bose
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, West Bengal, India
| | - Subhrangsu Chatterjee
- Division of Plant Biology, Bose Institute, Centenary Campus P-1/12 C.I.T., Scheme-VIIM Kolkata, 700054, West Bengal, India
| | - Nrisingha Dey
- Plant and Microbial biotechnology, Institute of Life Sciences (ILS), NALCO Square, Bhubaneswar, 751023, Odisha, India
| | - Debabrata Basu
- Division of Plant Biology, Bose Institute, Centenary Campus P-1/12 C.I.T., Scheme-VIIM Kolkata, 700054, West Bengal, India
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Bai M, Sun J, Liu J, Ren H, Wang K, Wang Y, Wang C, Dehesh K. The B-box protein BBX19 suppresses seed germination via induction of ABI5. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2019; 99:1192-1202. [PMID: 31112314 PMCID: PMC6744306 DOI: 10.1111/tpj.14415] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 04/30/2019] [Accepted: 05/09/2019] [Indexed: 05/04/2023]
Abstract
Seed germination is a fundamental process in the plant life cycle and is regulated by functionally opposing internal and external inputs. Here we explored the role of a negative regulator of photomorphogenesis, a B-box-containing protein (BBX19), as a molecular link between the inhibitory action of the phytohormone abscisic acid (ABA) and the promoting role of light in germination. We show that seeds of BBX19-overexpressing lines, in contrast to those of BBX19 RNA interference lines, display ABA hypersensitivity, albeit independently of elongated hypocotyl 5 (HY5). Moreover, we establish that BBX19 functions neither via perturbation of GA signaling, the ABA antagonistic phytohormone, nor through interference with the DELLA protein germination repressors. Rather, BBX19 functions as an inducer of ABA INSENSITIVE5 (ABI5) by binding to the light-responsive GT1 motifs in the gene promoter. In summary, we identify BBX19 as a regulatory checkpoint, directing diverse developmental processes and tailoring adaptive responses to distinct endogenous and exogenous signals.
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Affiliation(s)
- Mengjuan Bai
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Jingjing Sun
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Jinyi Liu
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Haoran Ren
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Kang Wang
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Yanling Wang
- College of Forestry, Shandong Agricultural University, Taian 271018, P.R. China
| | - Changquan Wang
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Katayoon Dehesh
- Department of Botany and Plant Sciences and Institute of Integrative Genome Biology, University of California, Riverside, California 92506, USA
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Zhang Y, Sun Q, Zhang C, Hao G, Wang C, Dirk LMA, Downie AB, Zhao T. Maize VIVIPAROUS1 Interacts with ABA INSENSITIVE5 to Regulate GALACTINOL SYNTHASE2 Expression Controlling Seed Raffinose Accumulation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:4214-4223. [PMID: 30915847 DOI: 10.1021/acs.jafc.9b00322] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Raffinose, an oligosaccharide found in many seeds, plays an important role in seed vigor; however, the regulatory mechanism governing raffinose biosynthesis remains unclear. We report here that maize W22 wild type (WT) seeds, but not W22 viviparous1 ( zmvp1) mutant seeds, start accumulating galactinol and raffinose 28 days after pollination (DAP). Transcriptome analysis of the zmvp1 embryo showed that the expression of GALACTINOL SYNTHASE2 ( GOLS2) was down-regulated relative to WT. Further experiments showed that the expression of ZmGOLS2 was up-regulated by ZmABI5 but not by ZmVP1, and it was further increased by the coexpression of ZmABI5 and ZmVP1 in maize protoplasts. ZmABI5 interacted with ZmVP1, while ZmABI5, but not ZmVP1, directly binds to the ZmGOLS2 promoter. Together, all of the findings suggest that ZmVP1 interacts with ZmABI5 and regulates ZmGOLS2 expression and raffinose accumulation in maize seeds.
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Affiliation(s)
| | | | | | | | | | - Lynnette M A Dirk
- Department of Horticulture, Seed Biology, College of Agriculture, Food, and Environment , University of Kentucky , Lexington , Kentucky 40546 , United States
| | - A Bruce Downie
- Department of Horticulture, Seed Biology, College of Agriculture, Food, and Environment , University of Kentucky , Lexington , Kentucky 40546 , United States
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47
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Zhao X, Dou L, Gong Z, Wang X, Mao T. BES1 hinders ABSCISIC ACID INSENSITIVE5 and promotes seed germination in Arabidopsis. THE NEW PHYTOLOGIST 2019; 221:908-918. [PMID: 30230549 DOI: 10.1111/nph.15437] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 08/03/2018] [Indexed: 05/18/2023]
Abstract
Proper regulation of seed germination is essential for the successful propagation of a plant. The transcription factor ABSCISIC ACID INSENSITIVE5 (ABI5) of the abscisic acid (ABA) signaling pathway plays a central role in the inhibition of seed germination. ABI5 is precisely regulated by the core ABA signaling components and multiple other factors. However, the complex regulatory network of ABI5 remains largely unknown. In this study, we determined the biochemical interaction between ABI5 and the BRINSENSITIVE1 (BRI1)-EMS-SUPPRESSOR1 (BES1) transcription factor of the brassinosteroid (BR) signaling pathway, as well as the function of BES1 regulating ABI5 during seed germination in Arabidopsis. BES1 directly interacts with ABI5 both in vitro and in vivo. The bZIP domain of ABI5, which is responsible for DNA binding, is critical for ABI5 binding to BES1. The interaction of BES1 with ABI5 significantly suppressed the binding of ABI5 to the promoter regions of downstream genes, which resulted in their reduced expression and consequently facilitated seed germination. This study shed new light on the coordination of multiple signaling pathways during seed germination. In particular, BES1 directly binds to ABI5, which interferes with its transcriptional activity and suppresses ABA signaling output.
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Affiliation(s)
- Xuan Zhao
- State Key Laboratory of Plant Physiology and Biochemistry, Department of Plant Sciences, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Liru Dou
- State Key Laboratory of Plant Physiology and Biochemistry, Department of Plant Sciences, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Zhizhong Gong
- State Key Laboratory of Plant Physiology and Biochemistry, Department of Plant Sciences, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Xiangfeng Wang
- State Key Laboratory of Plant Physiology and Biochemistry, Department of Plant Sciences, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Tonglin Mao
- State Key Laboratory of Plant Physiology and Biochemistry, Department of Plant Sciences, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
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Gupta P, Singh SK. Gene Regulatory Networks: Current Updates and Applications in Plant Biology. ENERGY, ENVIRONMENT, AND SUSTAINABILITY 2019. [DOI: 10.1007/978-981-15-0690-1_18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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49
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Liu J, Sherif SM. Hormonal Orchestration of Bud Dormancy Cycle in Deciduous Woody Perennials. FRONTIERS IN PLANT SCIENCE 2019; 10:1136. [PMID: 31620159 PMCID: PMC6759871 DOI: 10.3389/fpls.2019.01136] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 08/19/2019] [Indexed: 05/03/2023]
Abstract
Woody perennials enter seasonal dormancy to avoid unfavorable environmental conditions. Plant hormones are the critical mediators regulating this complex process, which is subject to the influence of many internal and external factors. Over the last two decades, our knowledge of hormone-mediated dormancy has increased considerably, primarily due to advancements in molecular biology, omics, and bioinformatics. These advancements have enabled the elucidation of several aspects of hormonal regulation associated with bud dormancy in various deciduous tree species. Plant hormones interact with each other extensively in a context-dependent manner. The dormancy-associated MADS (DAM) transcription factors appear to enable hormones and other internal signals associated with the transition between different phases of bud dormancy. These proteins likely hold a great potential in deciphering the underlying mechanisms of dormancy initiation, maintenance, and release. In this review, a recent understanding of the roles of plant hormones, their cross talks, and their potential interactions with DAM proteins during dormancy is discussed.
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50
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Yang B, Song Z, Li C, Jiang J, Zhou Y, Wang R, Wang Q, Ni C, Liang Q, Chen H, Fan LM. RSM1, an Arabidopsis MYB protein, interacts with HY5/HYH to modulate seed germination and seedling development in response to abscisic acid and salinity. PLoS Genet 2018; 14:e1007839. [PMID: 30566447 PMCID: PMC6317822 DOI: 10.1371/journal.pgen.1007839] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Revised: 01/03/2019] [Accepted: 11/19/2018] [Indexed: 12/03/2022] Open
Abstract
MYB transcription factors are involved in many biological processes, including metabolism, development and responses to biotic and abiotic stresses. RADIALIS-LIKE SANT/MYB 1 (RSM1) belongs to a MYB-related subfamily, and previous transcriptome analysis suggests that RSM1 may play roles in plant development, stress responses and plant hormone signaling. However, the molecular mechanisms of RSM1 action in response to abiotic stresses remain obscure. We show that down-regulation or up-regulation of RSM1 expression alters the sensitivity of seed germination and cotyledon greening to abscisic acid (ABA), NaCl and mannitol in Arabidopsis. The expression of RSM1 is dynamically regulated by ABA and NaCl. Transcription factors ELONGATED HYPOCOTYL 5 (HY5) and HY5 HOMOLOG (HYH) regulate RSM1 expression via binding to the RSM1 promoter. Genetic analyses reveal that RSM1 mediates multiple functions of HY5 in responses of seed germination, post-germination development to ABA and abiotic stresses, and seedling tolerance to salinity. Pull-down and BiFC assays show that RSM1 interacts with HY5/HYH in vitro and in vivo. RSM1 and HY5/HYH may function as a regulatory module in responses to ABA and abiotic stresses. RSM1 binds to the promoter of ABA INSENSITIVE 5 (ABI5), thereby regulating its expression, while RSM1 interaction also stimulates HY5 binding to the ABI5 promoter. However, no evidence was found in the dual-luciferase transient expression assay to support that RSM enhances the activation of ABI5 expression by HY. In summary, HY5/HYH and RSM1 may converge on the ABI5 promoter and independently or somehow dependently regulate ABI5 expression and ABI5-downstream ABA and abiotic stress-responsive genes, thereby improving the adaption of plants to the environment. The phytohormone abscisic acid (ABA) regulates multiple developmental processes in plants, including seed dormancy and germination, growth, and abiotic stress responses. The transcription factor ELONGATED HYPOCOTYL 5 (HY5), a core regulator of light signaling, is involved in ABA and abiotic stress responses by directly regulating the expression of ABA INSENSITIVE 5 (ABI5). In this study, we show that a MYB-related transcription factor, RADIALIS-LIKE SANT/MYB 1 (RSM1), plays important roles in ABA and salinity signaling in Arabidopsis, and we dissect the relationship between RSM1 and HY5. RSM1 interacts with HY5/HYH in vitro and in vivo and they may function as a regulatory module in responses to ABA and abiotic stresses. RSM1 binds to the promoter of ABI5, thereby regulating its expression; moreover, RSM1 interaction stimulates HY5 binding to the ABI5 promoter, but RSM1 was not found to enhance the activation of ABI5 expression by HY5. Genetic analyses reveal that RSM1 mediates the functions of HY5 in responses of seed germination, post-germination developmental responses to ABA and abiotic stresses, and seedling tolerance to salinity. In summary, our work demonstrates that HY5/HYH and RSM1 may bind with the ABI5 promoter to regulate ABI5 expression independently or somehow dependently, thereby controlling the expression of ABI5-downstream target genes in ABA and salinity signaling.
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Affiliation(s)
- Bencan Yang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Zihao Song
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Chaonan Li
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Jiahao Jiang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Yangyang Zhou
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Ruipu Wang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Qi Wang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Chang Ni
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Qing Liang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Haodong Chen
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Liu-Min Fan
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
- * E-mail:
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