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Kyung J, Jeong D, Eom H, Kim J, Kim JS, Lee I. C-TERMINAL DOMAIN PHOSPHATASE-LIKE 1 promotes flowering with TAF15b by repressing the floral repressor gene FLOWERING LOCUS C. Mol Cells 2024; 47:100114. [PMID: 39293741 DOI: 10.1016/j.mocell.2024.100114] [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: 09/04/2024] [Revised: 09/11/2024] [Accepted: 09/11/2024] [Indexed: 09/20/2024] Open
Abstract
Arabidopsis TATA-BINDING PROTEIN-ASSOCIATED FACTOR15b (TAF15b) is a plant-specific component of the transcription factor IID complex. TAF15b is involved in the autonomous pathway for flowering and represses the transcription of FLOWERING LOCUS C (FLC), a major floral repressor in Arabidopsis. While components of the autonomous flowering pathway have been extensively studied, scant attention has been directed toward elucidating the direct transcriptional regulators responsible for repressing FLC transcription. Here, we demonstrate that C-TERMINAL DOMAIN PHOSPHATASE-LIKE 1 (CPL1) is a physical and functional partner of TAF15b, playing a role in FLC repression. CPL1 is a protein phosphatase that dephosphorylates the C-terminal domain of RNA polymerase II (Pol II). Through the immunoprecipitation and mass spectrometry technique, we identified CPL1 as an interacting partner of TAF15b. Similar to taf15b, the cpl1 mutant showed a late-flowering phenotype caused by an increase in FLC levels. Additionally, the increase in cpl1 was correlated with the enrichment of phosphorylated Pol II in the FLC chromatin, as expected. We also discovered that CPL1 and TAF15b share additional common target genes through transcriptome analysis. These results suggest that TAF15b and CPL1 cooperatively repress transcription through the dephosphorylation of Pol II, especially at the FLC locus.
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Affiliation(s)
- Jinseul Kyung
- School of Biological Sciences, Seoul National University, Seoul 08826, Korea; Research Center for Plant Plasticity, Seoul National University, Seoul 08826, Korea
| | - Daesong Jeong
- School of Biological Sciences, Seoul National University, Seoul 08826, Korea; Research Center for Plant Plasticity, Seoul National University, Seoul 08826, Korea
| | - Hyunjoo Eom
- School of Biological Sciences, Seoul National University, Seoul 08826, Korea
| | - Jeesoo Kim
- School of Biological Sciences, Seoul National University, Seoul 08826, Korea; Center for RNA Research, Institute for Basic Science, Seoul 08826, Korea
| | - Jong-Seo Kim
- School of Biological Sciences, Seoul National University, Seoul 08826, Korea; Center for RNA Research, Institute for Basic Science, Seoul 08826, Korea
| | - Ilha Lee
- School of Biological Sciences, Seoul National University, Seoul 08826, Korea; Research Center for Plant Plasticity, Seoul National University, Seoul 08826, Korea; Plant Genomics and Breeding Institute, Seoul National University, Seoul 08826, Korea.
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2
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Agarwal P, Chittora A, Baraiya BM, Fatnani D, Patel K, Akhyani DD, Parida AK, Agarwal PK. Rab7 GTPase-Mediated stress signaling enhances salinity tolerance in AlRabring7 tobacco transgenics by modulating physio-biochemical parameters. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 214:108928. [PMID: 39033652 DOI: 10.1016/j.plaphy.2024.108928] [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: 04/11/2024] [Revised: 06/19/2024] [Accepted: 07/09/2024] [Indexed: 07/23/2024]
Abstract
The RING-type E3 ligases play a significant role in stress signaling, primarily through post-translational regulation. Ubiquitination is a crucial post-translational modification that regulates the turnover and activity of proteins. The overexpression of AlRabring7, RING-HC E3 Ub ligase in tobacco provides insights into the regulation of salinity and ABA signaling in transgenic tobacco. The seed germination potential of AlRabring7 transgenics was higher than WT, with NaCl and ABA treatments. The transgenics showed improved morpho-physio-biochemical parameters in response to salinity and ABA treatments. The photosynthetic pigments, soluble sugars, reducing sugars and proline increased in transgenics in response to NaCl and ABA treatments. The decreased ROS accumulation in transgenics on NaCl and ABA treatments can be co-related to improved activity of enzymatic and non-enzymatic antioxidants. The potential of transgenics to maintain ABA levels with ABA treatment, highlights the active participation of ABA feedback loop mechanism. Interestingly, the ability of AlRabring7 transgenics to upregulate Rab7 protein, suggests its role in facilitating vacuolar transport. Furthermore, the improved potassium accumulation and reduced sodium content indicate an efficient ion regulation mechanism in transgenic plants facilitating higher stomatal opening. The expression of downstream ion transporter (NbNHX1 and NbVHA1), ABA signaling (NbABI2 and NbABI5) and vesicle trafficking (NbMON1) responsive genes were upregulated with stress. The present study, reports that AlRabring7 participates in maintaining vacuolar transport, ion balance, ROS homeostasis, stomatal regulation through activation of Rab7 protein and regulation of downstream stress-responsive during stress. This emphasizes the potential of AlRabring7 gene for improved performance and resilience in challenging environments.
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Affiliation(s)
- Parinita Agarwal
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India.
| | - Anjali Chittora
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Bhagirath M Baraiya
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India
| | - Dhara Fatnani
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Khantika Patel
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India
| | - Dhanvi D Akhyani
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India
| | - Asish K Parida
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Pradeep K Agarwal
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, 364 002, Gujarat, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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3
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Kou H, Zhang X, Jia J, Xin M, Wang J, Mao L, Baltaevich AM, Song X. Research Progress in the Regulation of the ABA Signaling Pathway by E3 Ubiquitin Ligases in Plants. Int J Mol Sci 2024; 25:7120. [PMID: 39000226 PMCID: PMC11241352 DOI: 10.3390/ijms25137120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2024] [Revised: 06/11/2024] [Accepted: 06/21/2024] [Indexed: 07/16/2024] Open
Abstract
E3 ubiquitin ligases (UBLs), as enzymes capable of specifically recognizing target proteins in the process of protein ubiquitination, play crucial roles in regulating responses to abiotic stresses such as drought, salt, and temperature. Abscisic acid (ABA), a plant endogenous hormone, is essential to regulating plant growth, development, disease resistance, and defense against abiotic stresses, and acts through a complex ABA signaling pathway. Hormone signaling transduction relies on protein regulation, and E3 ubiquitin ligases play important parts in regulating the ABA pathway. Therefore, this paper reviews the ubiquitin-proteasome-mediated protein degradation pathway, ABA-related signaling pathways, and the regulation of ABA-signaling-pathway-related genes by E3 ubiquitin ligases, aiming to provide references for further exploration of the relevant research on how plant E3 ubiquitin ligases regulate the ABA pathway.
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Affiliation(s)
| | | | | | | | | | | | | | - Xianliang Song
- State Key Laboratory of Crop Biology, Agronomy College, Shandong Agricultural University, Tai’an 271018, China
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Su Y, Ngea GLN, Wang K, Lu Y, Godana EA, Ackah M, Yang Q, Zhang H. Deciphering the mechanism of E3 ubiquitin ligases in plant responses to abiotic and biotic stresses and perspectives on PROTACs for crop resistance. PLANT BIOTECHNOLOGY JOURNAL 2024. [PMID: 38864414 DOI: 10.1111/pbi.14407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 05/12/2024] [Accepted: 05/27/2024] [Indexed: 06/13/2024]
Abstract
With global climate change, it is essential to find strategies to make crops more resistant to different stresses and guarantee food security worldwide. E3 ubiquitin ligases are critical regulatory elements that are gaining importance due to their role in selecting proteins for degradation in the ubiquitin-proteasome proteolysis pathway. The role of E3 Ub ligases has been demonstrated in numerous cellular processes in plants responding to biotic and abiotic stresses. E3 Ub ligases are considered a class of proteins that are difficult to control by conventional inhibitors, as they lack a standard active site with pocket, and their biological activity is mainly due to protein-protein interactions with transient conformational changes. Proteolysis-targeted chimeras (PROTACs) are a new class of heterobifunctional molecules that have emerged in recent years as relevant alternatives for incurable human diseases like cancer because they can target recalcitrant proteins for destruction. PROTACs interact with the ubiquitin-proteasome system, principally the E3 Ub ligase in the cell, and facilitate proteasome turnover of the proteins of interest. PROTAC strategies harness the essential functions of E3 Ub ligases for proteasomal degradation of proteins involved in dysfunction. This review examines critical advances in E3 Ub ligase research in plant responses to biotic and abiotic stresses. It highlights how PROTACs can be applied to target proteins involved in plant stress response to mitigate pathogenic agents and environmental adversities.
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Affiliation(s)
- Yingying Su
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Guillaume Legrand Ngolong Ngea
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
- Institute of Fisheries Sciences, University of Douala, Douala, Cameroon
| | - Kaili Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Yuchun Lu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Esa Abiso Godana
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Michael Ackah
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Qiya Yang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Hongyin Zhang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
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5
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Xu J, Liu H, Zhou C, Wang J, Wang J, Han Y, Zheng N, Zhang M, Li X. The ubiquitin-proteasome system in the plant response to abiotic stress: Potential role in crop resilience improvement. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2024; 342:112035. [PMID: 38367822 DOI: 10.1016/j.plantsci.2024.112035] [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: 11/29/2023] [Revised: 02/09/2024] [Accepted: 02/11/2024] [Indexed: 02/19/2024]
Abstract
The post-translational modification (PTM) of proteins by ubiquitination modulates many physiological processes in plants. As the major protein degradation pathway in plants, the ubiquitin-proteasome system (UPS) is considered a promising target for improving crop tolerance drought, high salinity, extreme temperatures, and other abiotic stressors. The UPS also participates in abiotic stress-related abscisic acid (ABA) signaling. E3 ligases are core components of the UPS-mediated modification process due to their substrate specificity. In this review, we focus on the abiotic stress-associated regulatory mechanisms and functions of different UPS components, emphasizing the participation of E3 ubiquitin ligases. We also summarize and discuss UPS-mediated modulation of ABA signaling. In particular, we focus our review on recent research into the UPS-mediated modulation of the abiotic stress response in major crop plants. We propose that altering the ubiquitination site of the substrate or the substrate-specificity of E3 ligase using genome editing technology such as CRISPR/Cas9 may improve the resistance of crop plants to adverse environmental conditions. Such a strategy will require continued research into the role of the UPS in mediating the abiotic stress response in plants.
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Affiliation(s)
- Jian Xu
- Qiqihar Branch of the Heilongjiang Academy of Agricultural Sciences, Qiqihar, China; Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin, China
| | - Hongjie Liu
- State Key Laboratory of Plant Diversity and Specialty Crops, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Innovative Academy of Seed Design, Chinese Academy of Sciences, Guangzhou, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chao Zhou
- Qiqihar Branch of the Heilongjiang Academy of Agricultural Sciences, Qiqihar, China
| | - Jinxing Wang
- Suihua Branch of the Heilongjiang Academy of Agricultural Sciences, Suihua, China
| | - Junqiang Wang
- Qiqihar Branch of the Heilongjiang Academy of Agricultural Sciences, Qiqihar, China
| | - Yehui Han
- Qiqihar Branch of the Heilongjiang Academy of Agricultural Sciences, Qiqihar, China
| | - Nan Zheng
- Industrial Crop Institute, Heilongjiang Academy of Agricultural Sciences, Harbin, China
| | - Ming Zhang
- Industrial Crop Institute, Heilongjiang Academy of Agricultural Sciences, Harbin, China
| | - Xiaoming Li
- State Key Laboratory of Plant Diversity and Specialty Crops, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Innovative Academy of Seed Design, Chinese Academy of Sciences, Guangzhou, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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6
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Yang F, Zhao LL, Song LQ, Han Y, You CX, An JP. Apple E3 ligase MdPUB23 mediates ubiquitin-dependent degradation of MdABI5 to delay ABA-triggered leaf senescence. HORTICULTURE RESEARCH 2024; 11:uhae029. [PMID: 38585016 PMCID: PMC10995623 DOI: 10.1093/hr/uhae029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 01/24/2024] [Indexed: 04/09/2024]
Abstract
ABSCISIC ACID-INSENSITIVE5 (ABI5) is a core regulatory factor that mediates the ABA signaling response and leaf senescence. However, the molecular mechanism underlying the synergistic regulation of leaf senescence by ABI5 with interacting partners and the homeostasis of ABI5 in the ABA signaling response remain to be further investigated. In this study, we found that the accelerated effect of MdABI5 on leaf senescence is partly dependent on MdbHLH93, an activator of leaf senescence in apple. MdABI5 directly interacted with MdbHLH93 and improved the transcriptional activation of the senescence-associated gene MdSAG18 by MdbHLH93. MdPUB23, a U-box E3 ubiquitin ligase, physically interacted with MdABI5 and delayed ABA-triggered leaf senescence. Genetic and biochemical analyses suggest that MdPUB23 inhibited MdABI5-promoted leaf premature senescence by targeting MdABI5 for ubiquitin-dependent degradation. In conclusion, our results verify that MdABI5 accelerates leaf senescence through the MdABI5-MdbHLH93-MdSAG18 regulatory module, and MdPUB23 is responsible for the dynamic regulation of ABA-triggered leaf senescence by modulating the homeostasis of MdABI5.
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Affiliation(s)
- Fei Yang
- Apple Technology Innovation Center of Shandong Province, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, 271018, Shandong, China
| | - Ling-Ling Zhao
- Yantai Academy of Agricultural Sciences, Yan-Tai 265599, Shandong, China
| | - Lai-Qing Song
- Yantai Academy of Agricultural Sciences, Yan-Tai 265599, Shandong, China
| | - Yuepeng Han
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Hubei Hongshan Laboratory, The Innovative Academy of Seed Design of Chinese Academy of Sciences, Wuhan 430074, China
| | - Chun-Xiang You
- Apple Technology Innovation Center of Shandong Province, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, 271018, Shandong, China
| | - Jian-Ping An
- Apple Technology Innovation Center of Shandong Province, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, 271018, Shandong, China
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Hubei Hongshan Laboratory, The Innovative Academy of Seed Design of Chinese Academy of Sciences, Wuhan 430074, China
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7
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Song Y, He J, Guo J, Xie Y, Ma Z, Liu Z, Niu C, Li X, Chu B, Tahir MM, Xu J, Ma F, Guan Q. The chromatin remodeller MdRAD5B enhances drought tolerance by coupling MdLHP1-mediated H3K27me3 in apple. PLANT BIOTECHNOLOGY JOURNAL 2024; 22:617-634. [PMID: 37874929 PMCID: PMC10893944 DOI: 10.1111/pbi.14210] [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: 06/12/2023] [Revised: 09/25/2023] [Accepted: 10/06/2023] [Indexed: 10/26/2023]
Abstract
RAD5B belongs to the Rad5/16-like group of the SNF2 family, which often functions in chromatin remodelling. However, whether RAD5B is involved in chromatin remodelling, histone modification, and drought stress tolerance is largely unclear. We identified a drought-inducible chromatin remodeler, MdRAD5B, which positively regulates apple drought tolerance. Transposase-accessible chromatin with high-throughput sequencing (ATAC-seq) analysis showed that MdRAD5B affects the expression of 466 drought-responsive genes through its chromatin remodelling function in response to drought stress. In addition, MdRAD5B interacts with and degrades MdLHP1, a crucial regulator of histone H3 trimethylation at K27 (H3K27me3), through the ubiquitin-independent 20S proteasome. Chromatin immunoprecipitation-sequencing (ChIP-seq) analysis revealed that MdRAD5B modulates the H3K27me3 deposition of 615 genes in response to drought stress. Genetic interaction analysis showed that MdRAD5B mediates the H3K27me3 deposition of drought-responsive genes through MdLHP1, which causes their expression changes under drought stress. Our results unravelled a dual function of MdRAD5B in gene expression modulation in apple in response to drought, that is, via the regulation of chromatin remodelling and H3K27me3.
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Affiliation(s)
- Yi Song
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Jieqiang He
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Junxing Guo
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Yinpeng Xie
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Ziqing Ma
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Zeyuan Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Chundong Niu
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Xuewei Li
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Baohua Chu
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Muhammad Mobeen Tahir
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Jidi Xu
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Fengwang Ma
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
| | - Qingmei Guan
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of HorticultureNorthwest A&F UniversityYanglingChina
- Shenzhen Research InstituteNorthwest A&F UniversityShenzhenChina
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8
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Qin Z, Wang T, Zhao Y, Ma C, Shao Q. Molecular Machinery of Lipid Droplet Degradation and Turnover in Plants. Int J Mol Sci 2023; 24:16039. [PMID: 38003229 PMCID: PMC10671748 DOI: 10.3390/ijms242216039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 10/23/2023] [Accepted: 10/29/2023] [Indexed: 11/26/2023] Open
Abstract
Lipid droplets (LDs) are important organelles conserved across eukaryotes with a fascinating biogenesis and consumption cycle. Recent intensive research has focused on uncovering the cellular biology of LDs, with emphasis on their degradation. Briefly, two major pathways for LD degradation have been recognized: (1) lipolysis, in which lipid degradation is catalyzed by lipases on the LD surface, and (2) lipophagy, in which LDs are degraded by autophagy. Both of these pathways require the collective actions of several lipolytic and proteolytic enzymes, some of which have been purified and analyzed for their in vitro activities. Furthermore, several genes encoding these proteins have been cloned and characterized. In seed plants, seed germination is initiated by the hydrolysis of stored lipids in LDs to provide energy and carbon equivalents for the germinating seedling. However, little is known about the mechanism regulating the LD mobilization. In this review, we focus on recent progress toward understanding how lipids are degraded and the specific pathways that coordinate LD mobilization in plants, aiming to provide an accurate and detailed outline of the process. This will set the stage for future studies of LD dynamics and help to utilize LDs to their full potential.
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Affiliation(s)
| | | | | | - Changle Ma
- Shandong Provincial Key Laboratory of Plant Stress, College of Life Sciences, Shandong Normal University, Jinan 250358, China
| | - Qun Shao
- Shandong Provincial Key Laboratory of Plant Stress, College of Life Sciences, Shandong Normal University, Jinan 250358, China
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9
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Traver MS, Bartel B. The ubiquitin-protein ligase MIEL1 localizes to peroxisomes to promote seedling oleosin degradation and lipid droplet mobilization. Proc Natl Acad Sci U S A 2023; 120:e2304870120. [PMID: 37410814 PMCID: PMC10629534 DOI: 10.1073/pnas.2304870120] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 06/02/2023] [Indexed: 07/08/2023] Open
Abstract
Lipid droplets are organelles conserved across eukaryotes that store and release neutral lipids to regulate energy homeostasis. In oilseed plants, fats stored in seed lipid droplets provide fixed carbon for seedling growth before photosynthesis begins. As fatty acids released from lipid droplet triacylglycerol are catabolized in peroxisomes, lipid droplet coat proteins are ubiquitinated, extracted, and degraded. In Arabidopsis seeds, the predominant lipid droplet coat protein is OLEOSIN1 (OLE1). To identify genes modulating lipid droplet dynamics, we mutagenized a line expressing mNeonGreen-tagged OLE1 expressed from the OLE1 promoter and isolated mutants with delayed oleosin degradation. From this screen, we identified four miel1 mutant alleles. MIEL1 (MYB30-interacting E3 ligase 1) targets specific MYB transcription factors for degradation during hormone and pathogen responses [D. Marino et al., Nat. Commun. 4, 1476 (2013); H. G. Lee and P. J. Seo, Nat. Commun. 7, 12525 (2016)] but had not been implicated in lipid droplet dynamics. OLE1 transcript levels were unchanged in miel1 mutants, indicating that MIEL1 modulates oleosin levels posttranscriptionally. When overexpressed, fluorescently tagged MIEL1 reduced oleosin levels, causing very large lipid droplets. Unexpectedly, fluorescently tagged MIEL1 localized to peroxisomes. Our data suggest that MIEL1 ubiquitinates peroxisome-proximal seed oleosins, targeting them for degradation during seedling lipid mobilization. The human MIEL1 homolog (PIRH2; p53-induced protein with a RING-H2 domain) targets p53 and other proteins for degradation and promotes tumorigenesis [A. Daks et al., Cells 11, 1515 (2022)]. When expressed in Arabidopsis, human PIRH2 also localized to peroxisomes, hinting at a previously unexplored role for PIRH2 in lipid catabolism and peroxisome biology in mammals.
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Affiliation(s)
- Melissa S. Traver
- Department of Biosciences, Biochemistry and Cell Biology Program, Rice University, Houston, TX77005
| | - Bonnie Bartel
- Department of Biosciences, Biochemistry and Cell Biology Program, Rice University, Houston, TX77005
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10
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Liu W, Chen G, He M, Wu J, Wen W, Gu Q, Guo S, Wang Y, Sun J. ABI5 promotes heat stress-induced chlorophyll degradation by modulating the stability of MYB44 in cucumber. HORTICULTURE RESEARCH 2023; 10:uhad089. [PMID: 37334179 PMCID: PMC10273075 DOI: 10.1093/hr/uhad089] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 04/27/2023] [Indexed: 06/20/2023]
Abstract
The yellowing of leaves caused by the decomposition of chlorophyll (Chl) is a characteristic event during senescence, which can be induced by various environmental stresses. However, the molecular mechanisms of high temperature-induced Chl degradation in horticultural plants remain poorly understood. Here, we found that heat stress induced Chl degradation and the expression of ABI5 and MYB44 in cucumber. Silencing of ABI5 compromised heat stress-induced Chl degradation, and the transcription of pheophytinase (PPH) and pheophorbide a oxygenase (PAO), two key genes in Chl catabolic pathway, but silencing of MYB44 exhibited the opposite results. Furthermore, ABI5 interacted with MYB44 in vitro and in vivo. ABI5 positively regulated heat stress-induced Chl degradation through two pathways. ABI5 directly bound to PPH and PAO promoters to promote their expression, leading to accelerating Chl degradation. On the other hand, the interaction between ABI5 and MYB44 reduced the binding of MYB44 to PPH and PAO promoters and led to the ubiquitination-depended protein degradation of MYB44, thereby alleviating the transcription inhibitory effect of MYB44 on PPH and PAO. Taken together, our findings propose a new regulatory network for ABI5 in regulating heat stress-induced Chl degradation.
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Affiliation(s)
- Weikang Liu
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Guangling Chen
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Mingming He
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Jianqiang Wu
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Wenxu Wen
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Qinsheng Gu
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Shirong Guo
- College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
| | - Yu Wang
- Corresponding authors: E-mails: ;
| | - Jin Sun
- Corresponding authors: E-mails: ;
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11
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Wei W, Yang YY, Lakshmanan P, Kuang JF, Lu WJ, Pang XQ, Chen JY, Shan W. Proteasomal degradation of MaMYB60 mediated by the E3 ligase MaBAH1 causes high temperature-induced repression of chlorophyll catabolism and green ripening in banana. THE PLANT CELL 2023; 35:1408-1428. [PMID: 36748200 PMCID: PMC10118274 DOI: 10.1093/plcell/koad030] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 01/16/2023] [Indexed: 06/18/2023]
Abstract
Banana (Musa acuminata) fruits ripening at 30 °C or above fail to develop yellow peels; this phenomenon, called green ripening, greatly reduces their marketability. The regulatory mechanism underpinning high temperature-induced green ripening remains unknown. Here we decoded a transcriptional and post-translational regulatory module that causes green ripening in banana. Banana fruits ripening at 30 °C showed greatly reduced expression of 5 chlorophyll catabolic genes (CCGs), MaNYC1 (NONYELLOW COLORING 1), MaPPH (PHEOPHYTINASE), MaTIC55 (TRANSLOCON AT THE INNER ENVELOPE MEMBRANE OF CHLOROPLASTS 55), MaSGR1 (STAY-GREEN 1), and MaSGR2 (STAY-GREEN 2), compared to those ripening at 20 °C. We identified a MYB transcription factor, MaMYB60, that activated the expression of all 5 CCGs by directly binding to their promoters during banana ripening at 20 °C, while showing a weaker activation at 30 °C. At high temperatures, MaMYB60 was degraded. We discovered a RING-type E3 ligase MaBAH1 (benzoic acid hypersensitive 1) that ubiquitinated MaMYB60 during green ripening and targeted it for proteasomal degradation. MaBAH1 thus facilitated MaMYB60 degradation and attenuated MaMYB60-induced transactivation of CCGs and chlorophyll degradation. By contrast, MaMYB60 upregulation increased CCG expression, accelerated chlorophyll degradation, and mitigated green ripening. Collectively, our findings unravel a dynamic, temperature-responsive MaBAH1-MaMYB60-CCG module that regulates chlorophyll catabolism, and the molecular mechanism underpinning green ripening in banana. This study also advances our understanding of plant responses to high-temperature stress.
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Affiliation(s)
- Wei Wei
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/Guangdong Provincial Key Laboratory of Postharvest Science of Fruits and Vegetables/Engineering Research Center of Southern Horticultural Products Preservation, Ministry of Education, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Ying-ying Yang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/Guangdong Provincial Key Laboratory of Postharvest Science of Fruits and Vegetables/Engineering Research Center of Southern Horticultural Products Preservation, Ministry of Education, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Prakash Lakshmanan
- Sugarcane Research Institute, Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture/Guangxi Key Laboratory of Sugarcane Genetic Improvement, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
- Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, Southwest University, Chongqing 400716, China
- Queensland Alliance for Agriculture and Food Innovation, University of Queensland, St Lucia, QLD 4067, Australia
| | - Jian-fei Kuang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/Guangdong Provincial Key Laboratory of Postharvest Science of Fruits and Vegetables/Engineering Research Center of Southern Horticultural Products Preservation, Ministry of Education, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Wang-jin Lu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/Guangdong Provincial Key Laboratory of Postharvest Science of Fruits and Vegetables/Engineering Research Center of Southern Horticultural Products Preservation, Ministry of Education, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Xue-qun Pang
- College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Jian-ye Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/Guangdong Provincial Key Laboratory of Postharvest Science of Fruits and Vegetables/Engineering Research Center of Southern Horticultural Products Preservation, Ministry of Education, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Wei Shan
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/Guangdong Provincial Key Laboratory of Postharvest Science of Fruits and Vegetables/Engineering Research Center of Southern Horticultural Products Preservation, Ministry of Education, College of Horticulture, South China Agricultural University, Guangzhou 510642, China
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12
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Kim JH, Kim MS, Seo YW. Overexpression of a plant U-box gene TaPUB4 confers drought stress tolerance in Arabidopsis thaliana. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2023; 196:596-607. [PMID: 36780722 DOI: 10.1016/j.plaphy.2023.02.001] [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: 11/30/2022] [Revised: 01/18/2023] [Accepted: 02/01/2023] [Indexed: 06/18/2023]
Abstract
Drought stress frequently results in significant reductions in crop production and yield. Plant U-box proteins (PUB) play a key role in the response to abiotic stress. Despite extensive characterization of PUB in model plants, their roles in wheat abiotic stress response remains unknown. In this study, we identified the physiological function of TaPUB4, a gene encoding the U-box and nuclear localization domains. The transcription level of TaPUB4 was induced by drought (mannitol) and abscisic acid. TaPUB4 displays E3 ubiquitin ligase activity and is located in the nucleus. Overexpression of TaPUB4 in Arabidopsis plants enhanced sensitivity with under ABA condition during early seedling developmental stages. In addition, the stomatal conductance of TaPUB4 was closer to that of WT under ABA conditions. Moreover, TaPUB4 facilitated stomatal response to elevated CO2 emission rates under ABA conditions. TaPUB4-overexpressing Arabidopsis, on the other hand, was more resistant to drought stress in plant development, demonstrating that TaPUB4 positively regulates drought-mediated control of plant growth. Moreover, the ectopic expression of the TaPUB4 gene was significant influential in drought sensitive metrics including survival rate, chlorophyll content, water loss, proline content and the expression of drought stress-response genes. Collectively, our results demonstrate that TaPUB4 may regulate drought stress response and ABA conditions.
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Affiliation(s)
- Jae Ho Kim
- Department of Plant Biotechnology, Korea University, Seoul, Republic of Korea; Institute of Animal Molecular Biotechnology, Korea University, Seoul, Republic of Korea
| | - Moon Seok Kim
- Department of Plant Biotechnology, Korea University, Seoul, Republic of Korea
| | - Yong Weon Seo
- Department of Plant Biotechnology, Korea University, Seoul, Republic of Korea.
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13
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Genome-Wide Identification, Expression and Interaction Analysis of GmSnRK2 and Type A PP2C Genes in Response to Abscisic Acid Treatment and Drought Stress in Soybean Plant. Int J Mol Sci 2022; 23:ijms232113166. [PMID: 36361951 PMCID: PMC9653956 DOI: 10.3390/ijms232113166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 10/26/2022] [Indexed: 11/17/2022] Open
Abstract
As a typical ancient tetraploid, soybean (Glycine max) is an important oil crop species and plays a crucial role in supplying edible oil, plant protein and animal fodder worldwide. As global warming intensifies, the yield of soybean in the field is often strongly restricted by drought stress. SNF1-related protein kinase 2 (SnRK2) and type A protein phosphatase 2C (PP2C-A) family members are core components of the abscisic acid (ABA) signal transduction pathway in plants and have been suggested to play important roles in increasing plant tolerance to drought stress, but genetic information supporting this idea is still lacking in soybean. Here, we cloned the GmSnRK2s and GmPP2C-A family genes from the reference genome of Williams 82 soybean. The results showed that the expression patterns of GmSnRK2s and GmPP2C-As are spatiotemporally distinct. The expression of GmSnRK2s in response to ABA and drought signals is not strictly the same as that of Arabidopsis SnRK2 homologous genes. Moreover, our results indicated that the duplicate pairs of GmSnRK2s and GmPP2C-As have similar expression patterns, cis-elements and relationships. GmSnRK2.2 may have a distinct function in the drought-mediated ABA signaling pathway. Furthermore, the results of yeast two-hybrid (Y2H) assays between GmSnRK2s and GmPP2C-As revealed that GmSnRK2.17, GmSnRK2.18, GmSnRK2.22, GmPP2C5, GmPP2C7, GmPP2C10 and GmPP2C17 may play central roles in the crosstalk among ABA signals in response to drought stress. Furthermore, GmPP2C-As and GmSnRKs were targeted by miRNA and validated by degradome sequencing, which may play multiple roles in the crosstalk between ABA and drought signals and other stress signals. Taken together, these results indicate that GmSnRK2s and GmPP2C-As may play a variety of roles in the drought-mediated ABA signaling pathway.
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14
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Cho NH, Woo OG, Kim EY, Park K, Seo DH, Yu SG, Choi YA, Lee JH, Lee JH, Kim WT. E3 ligase AtAIRP5/GARU regulates drought stress response by stimulating SERINE CARBOXYPEPTIDASE-LIKE1 turnover. PLANT PHYSIOLOGY 2022; 190:898-919. [PMID: 35699505 PMCID: PMC9434184 DOI: 10.1093/plphys/kiac289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 05/28/2022] [Indexed: 06/15/2023]
Abstract
Ubiquitination is a major mechanism of eukaryotic posttranslational protein turnover that has been implicated in abscisic acid (ABA)-mediated drought stress response. Here, we isolated T-DNA insertion mutant lines in which ABA-insensitive RING protein 5 (AtAIRP5) was suppressed, resulting in hyposensitive ABA-mediated germination compared to wild-type Arabidopsis (Arabidopsis thaliana) plants. A homology search revealed that AtAIRP5 is identical to gibberellin (GA) receptor RING E3 ubiquitin (Ub) ligase (GARU), which downregulates GA signaling by degrading the GA receptor GID1, and thus AtAIRP5 was renamed AtAIRP5/GARU. The atairp5/garu knockout progeny were impaired in ABA-dependent stomatal closure and were markedly more susceptible to drought stress than wild-type plants, indicating a positive role for AtAIRP5/GARU in the ABA-mediated drought stress response. Yeast two-hybrid, pull-down, target ubiquitination, and in vitro and in planta degradation assays identified serine carboxypeptidase-like1 (AtSCPL1), which belongs to the clade 1A AtSCPL family, as a ubiquitinated target protein of AtAIRP5/GARU. atscpl1 single and atairp5/garu-1 atscpl1-2 double mutant plants were more tolerant to drought stress than wild-type plants in an ABA-dependent manner, suggesting that AtSCPL1 is genetically downstream of AtAIRP5/GARU. After drought treatment, the endogenous ABA levels in atscpl1 and atairp5/garu-1 atscpl1-2 mutant leaves were higher than those in wild-type and atairp5/garu leaves. Overall, our results suggest that AtAIRP5/GARU RING E3 Ub ligase functions as a positive regulator of the ABA-mediated drought response by promoting the degradation of AtSCPL1.
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Affiliation(s)
| | | | | | | | - Dong Hye Seo
- Department of Systems Biology, Division of Life Science, Yonsei University, Seoul, 03722, Korea
- Institute of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Korea
| | - Seong Gwan Yu
- Department of Systems Biology, Division of Life Science, Yonsei University, Seoul, 03722, Korea
- Institute of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Korea
| | | | - Ji Hee Lee
- Department of Systems Biology, Division of Life Science, Yonsei University, Seoul, 03722, Korea
- Institute of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Korea
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15
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Xiao L, Shi Y, Wang R, Feng Y, Wang L, Zhang H, Shi X, Jing G, Deng P, Song T, Jing W, Zhang W. The transcription factor OsMYBc and an E3 ligase regulate expression of a K+ transporter during salt stress. PLANT PHYSIOLOGY 2022; 190:843-859. [PMID: 35695778 PMCID: PMC9434319 DOI: 10.1093/plphys/kiac283] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 05/10/2022] [Indexed: 05/27/2023]
Abstract
Sodium (Na+) and potassium (K+) homeostasis is essential for plant survival in saline soils. A member of the High-Affinity K+ Transporter (HKT) family in rice (Oryza sativa), OsHKT1;1, is a vital regulator of Na+ exclusion from shoots and is bound by a MYB transcription factor (OsMYBc). Here, we generated transgenic rice lines in the oshkt1;1 mutant background for genetic complementation using genomic OsHKT1;1 containing a native (Com) or mutated (mCom) promoter that cannot be bound by OsMYBc. In contrast to wild-type (WT) or Com lines, the mCom lines were not able to recover the salt-sensitive phenotype of oshkt1;1. The OsMYBc-overexpressing plants were more tolerant to salt stress than WT plants. A yeast two-hybrid screen using the OsMYBc N-terminus as bait identified a rice MYBc stress-related RING finger protein (OsMSRFP). OsMSRFP is an active E3 ligase that ubiquitinated OsMYBc in vitro and mediated 26S proteasome-mediated degradation of OsMYBc under semi-in vitro and in vivo conditions. OsMSRFP attenuated OsMYBc-mediated OsHKT1;1 expression, and knockout of OsMSRFP led to rice salt tolerance. These findings uncover a regulatory mechanism of salt response that fine-tunes OsHKT1;1 transcription by ubiquitination of OsMYBc.
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Affiliation(s)
- Longyun Xiao
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
- College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China
| | - Yiyuan Shi
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Rong Wang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Yu Feng
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Lesheng Wang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Hongsheng Zhang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Xingyu Shi
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Guangqin Jing
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Ping Deng
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Tengzhao Song
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Wen Jing
- Authors for correspondence: (W.Z.); (W.J.)
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16
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Zhang Y, Tan Q, Wang N, Meng X, He H, Wen B, Xiao W, Chen X, Li D, Fu X, Li L. PpMYB52 negatively regulates peach bud break through the gibberellin pathway and through interactions with PpMIEL1. FRONTIERS IN PLANT SCIENCE 2022; 13:971482. [PMID: 36035719 PMCID: PMC9413399 DOI: 10.3389/fpls.2022.971482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
Bud dormancy, which enables damage from cold temperatures to be avoided during winter and early spring, is an important adaptive mechanism of deciduous fruit trees to cope with seasonal environmental changes and temperate climates. Understanding the regulatory mechanism of bud break in fruit trees is highly important for the artificial control of bud break and the prevention of spring frost damage. However, the molecular mechanism underlying the involvement of MYB TFs during the bud break of peach is still unclear. In this study, we isolated and identified the PpMYB52 (Prupe.5G240000.1) gene from peach; this gene is downregulated in the process of bud break, upregulated in response to ABA and downregulated in response to GA. Overexpression of PpMYB52 suppresses the germination of transgenic tomato seeds. In addition, Y2H, Bimolecular fluorescence complementation (BiFC) assays verified that PpMYB52 interacts with a RING-type E3 ubiquitin ligase, PpMIEL1, which is upregulated during bud break may positively regulate peach bud break by ubiquitination-mediated degradation of PpMYB52. Our findings are the first to characterize the molecular mechanisms underlying the involvement of MYB TFs in peach bud break, increasing awareness of dormancy-related molecules to avoid bud damage in perennial deciduous fruit trees.
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Affiliation(s)
- Yuzheng Zhang
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Qiuping Tan
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Ning Wang
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Xiangguang Meng
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Huajie He
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Binbin Wen
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Wei Xiao
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Xiude Chen
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Dongmei Li
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Xiling Fu
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
| | - Ling Li
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, China
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
- Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, Shandong Agricultural University, Tai’an, China
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17
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Lin M, Qiao P, Matschi S, Vasquez M, Ramstein GP, Bourgault R, Mohammadi M, Scanlon MJ, Molina I, Smith LG, Gore MA. Integrating GWAS and TWAS to elucidate the genetic architecture of maize leaf cuticular conductance. PLANT PHYSIOLOGY 2022; 189:2144-2158. [PMID: 35512195 PMCID: PMC9342973 DOI: 10.1093/plphys/kiac198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 03/28/2022] [Indexed: 05/11/2023]
Abstract
The cuticle, a hydrophobic layer of cutin and waxes synthesized by plant epidermal cells, is the major barrier to water loss when stomata are closed. Dissecting the genetic architecture of natural variation for maize (Zea mays L.) leaf cuticular conductance (gc) is important for identifying genes relevant to improving crop productivity in drought-prone environments. To this end, we performed an integrated genome- and transcriptome-wide association studies (GWAS and TWAS) to identify candidate genes putatively regulating variation in leaf gc. Of the 22 plausible candidate genes identified, 4 were predicted to be involved in cuticle precursor biosynthesis and export, 2 in cell wall modification, 9 in intracellular membrane trafficking, and 7 in the regulation of cuticle development. A gene encoding an INCREASED SALT TOLERANCE1-LIKE1 (ISTL1) protein putatively involved in intracellular protein and membrane trafficking was identified in GWAS and TWAS as the strongest candidate causal gene. A set of maize nested near-isogenic lines that harbor the ISTL1 genomic region from eight donor parents were evaluated for gc, confirming the association between gc and ISTL1 in a haplotype-based association analysis. The findings of this study provide insights into the role of regulatory variation in the development of the maize leaf cuticle and will ultimately assist breeders to develop drought-tolerant maize for target environments.
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Affiliation(s)
- Meng Lin
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, New York 14853, USA
| | - Pengfei Qiao
- Plant Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, New York 14853, USA
| | | | - Miguel Vasquez
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, California 92093, USA
| | | | - Richard Bourgault
- Department of Biology, Algoma University, Sault Ste Marie, ON P6A 2G4, Canada
| | - Marc Mohammadi
- Department of Biology, Algoma University, Sault Ste Marie, ON P6A 2G4, Canada
| | - Michael J Scanlon
- Plant Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, New York 14853, USA
| | - Isabel Molina
- Department of Biology, Algoma University, Sault Ste Marie, ON P6A 2G4, Canada
| | - Laurie G Smith
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, California 92093, USA
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18
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Ubiquitin ligases at the nexus of plant responses to biotic and abiotic stresses. Essays Biochem 2022; 66:123-133. [PMID: 35704617 DOI: 10.1042/ebc20210070] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 05/11/2022] [Accepted: 05/30/2022] [Indexed: 01/15/2023]
Abstract
Plants must cope with an ever-changing environment, including concurrent biotic and abiotic stresses. The ubiquitin-proteasome system (UPS) is intricately involved in regulating signaling events that facilitate cellular changes required to mitigate the detrimental effects of environmental stress. A key component of the UPS are ubiquitin ligases (or E3s) that catalyze the attachment of ubiquitin molecules to select substrate proteins, which are then recognized by the 26S proteasome for degradation. With the identification of substrate proteins, a growing number of E3s are shown to differentially regulate responses to abiotic as well as bioitic stresses. The review discusses select E3s to illustrate the role of ubiquitin ligases as negative and/or positive regulators of responses to both biotic and abiotic stresses.
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19
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Zhang L, Dai Y, Yue L, Chen G, Yuan L, Zhang S, Li F, Zhang H, Li G, Zhu S, Hou J, Tang X, Zhang S, Wang C. Heat stress response in Chinese cabbage ( Brassica rapa L.) revealed by transcriptome and physiological analysis. PeerJ 2022; 10:e13427. [PMID: 35637719 PMCID: PMC9147330 DOI: 10.7717/peerj.13427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 04/21/2022] [Indexed: 01/14/2023] Open
Abstract
High temperatures have a serious impact on the quality and yield of cold-loving Chinese cabbage, which has evolved to have a unique set of stress mechanisms. To explore the relationship between these mechanisms and the heat-tolerance of Chinese cabbage, the physiological indicators of the heat-tolerant '268' line and heat-sensitive '334' line were measured. Under heat stress, the proline (Pro), soluble sugar (SS), and superoxide dismutase (SOD) indexes of the '268' line increased significantly. When additionally using transcriptome analysis, we found that the identified 3,360 DEGs were abundantly enriched in many metabolic pathways including 'plant hormone signal transduction', 'carbon metabolism', and 'glycolysis/gluconeogenesis'. Dynamic gene expression patterns showed that HKL1 in Cluster 15 may be a key factor in the regulation of sugar homeostasis. The interaction network screened four ABA-related genes in Cluster 15, suggesting that high temperatures lead to changes in hormonal signaling, especially an increase in ABA signaling. Compared with the '334' line, the expressions of Prx50, Prx52, Prx54, SOD1, and SOD2 in the '268' line were significantly upregulated, and these genes were actively involved in the reactive oxygen species (ROS) scavenging process. In summary, our results revealed the relationship between plant heat tolerance, physiology, and biochemistry and may also provide ideas for the future development of high-quality and heat-tolerant Chinese cabbage germplasm resources.
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Affiliation(s)
- Lei Zhang
- College of Horticulture, Vegetable Genetics and Breeding Laboratory, Anhui Agricultural University, Hefei, China,Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yun Dai
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Lixin Yue
- Institute of Vegetables, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Guohu Chen
- College of Horticulture, Vegetable Genetics and Breeding Laboratory, Anhui Agricultural University, Hefei, China
| | - Lingyun Yuan
- College of Horticulture, Vegetable Genetics and Breeding Laboratory, Anhui Agricultural University, Hefei, China
| | - Shifan Zhang
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Fei Li
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Hui Zhang
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Guoliang Li
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Shidong Zhu
- College of Horticulture, Vegetable Genetics and Breeding Laboratory, Anhui Agricultural University, Hefei, China
| | - Jinfeng Hou
- College of Horticulture, Vegetable Genetics and Breeding Laboratory, Anhui Agricultural University, Hefei, China
| | - Xiaoyan Tang
- College of Horticulture, Vegetable Genetics and Breeding Laboratory, Anhui Agricultural University, Hefei, China
| | - Shujiang Zhang
- Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Chenggang Wang
- College of Horticulture, Vegetable Genetics and Breeding Laboratory, Anhui Agricultural University, Hefei, China
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Lee SB, Suh MC. Regulatory mechanisms underlying cuticular wax biosynthesis. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:2799-2816. [PMID: 35560199 DOI: 10.1093/jxb/erab509] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 11/18/2021] [Indexed: 05/24/2023]
Abstract
Plants are sessile organisms that have developed hydrophobic cuticles that cover their aerial epidermal cells to protect them from terrestrial stresses. The cuticle layer is mainly composed of cutin, a polyester of hydroxy and epoxy fatty acids, and cuticular wax, a mixture of very-long-chain fatty acids (>20 carbon atoms) and their derivatives, aldehydes, alkanes, ketones, alcohols, and wax esters. During the last 30 years, forward and reverse genetic, transcriptomic, and biochemical approaches have enabled the identification of key enzymes, transporters, and regulators involved in the biosynthesis of cutin and cuticular waxes. In particular, cuticular wax biosynthesis is significantly influenced in an organ-specific manner or by environmental conditions, and is controlled using a variety of regulators. Recent studies on the regulatory mechanisms underlying cuticular wax biosynthesis have enabled us to understand how plants finely control carbon metabolic pathways to balance between optimal growth and development and defense against abiotic and biotic stresses. In this review, we summarize the regulatory mechanisms underlying cuticular wax biosynthesis at the transcriptional, post-transcriptional, post-translational, and epigenetic levels.
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Affiliation(s)
- Saet Buyl Lee
- Department of Agricultural Biotechnology, National Institute of Agricultural Sciences, Rural Development Administration, Jeonju, 54874, Korea
| | - Mi Chung Suh
- Department of Life Science, Sogang University, Seoul, 04107, Korea
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21
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Nie K, Zhao H, Wang X, Niu Y, Zhou H, Zheng Y. The MIEL1-ABI5/MYB30 regulatory module fine tunes abscisic acid signaling during seed germination. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2022; 64:930-941. [PMID: 35167730 DOI: 10.1111/jipb.13234] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 02/14/2022] [Indexed: 06/14/2023]
Abstract
The transcription factor ABSCISIC ACID INSENSITIVE5 (ABI5) plays a crucial role in abscisic acid (ABA) signaling during seed germination. However, how ABI5 is regulated during this process is poorly understood. Here, we report that the ubiquitin E3 ligase MIEL1 and its target transcription factor MYB30 modulate ABA responses in Arabidopsis thaliana during seed germination and seedling establishment via the precise regulation of ABI5. MIEL1 interacts with and ubiquitinates ABI5 to facilitate its degradation during germination. The transcription factor MYB30, whose turnover is mediated by MIEL1 during seed germination, also interacts with ABI5 to interfere with its transcriptional activity. MYB30 functions downstream of MIEL1 in the ABA response, and both are epistatic to ABI5 in ABA-mediated inhibition of seed germination and postgerminative growth. ABA treatment induces the degradation of MIEL1 and represses the interaction between MIEL1 and ABI5/MYB30, thus releasing both ABI5 and MYB30. Our results demonstrate that MIEL1 directly mediates the proteasomal degradation of ABI5 and inhibits its activity via the release of its target protein MYB30, thus ensuring precise ABA signaling during seed germination and seedling establishment.
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Affiliation(s)
- Kaili Nie
- State Key Laboratory of Crop Stress Adaptation and Improvement, Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, Kaifeng, 475001, China
| | - Hongyun Zhao
- State Key Laboratory of Crop Stress Adaptation and Improvement, Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, Kaifeng, 475001, China
| | - Xiaopei Wang
- State Key Laboratory of Crop Stress Adaptation and Improvement, Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, Kaifeng, 475001, China
| | - Yanli Niu
- State Key Laboratory of Crop Stress Adaptation and Improvement, Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, Kaifeng, 475001, China
| | - Huapeng Zhou
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610064, China
| | - Yuan Zheng
- State Key Laboratory of Crop Stress Adaptation and Improvement, Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, Kaifeng, 475001, China
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22
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Allipra S, Anirudhan K, Shivanandan S, Raghunathan A, Maruthachalam R. The kinetochore protein NNF1 has a moonlighting role in the vegetative development of Arabidopsis thaliana. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2022; 109:1064-1085. [PMID: 34850467 DOI: 10.1111/tpj.15614] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 11/25/2021] [Indexed: 06/13/2023]
Abstract
The kinetochore is a supramolecular protein complex assembled on the chromosomes, essential for faithful segregation of the genome during cell divisions. More than 100 proteins are known to constitute the eukaryotic kinetochore architecture, primarily identified using non-plant organisms. A majority of them are fast evolving and are under positive selection. Thus, functional characterization of the plant kinetochore proteins is limited as only a few conserved orthologs sharing sequence similarity with their animal counterparts have been examined. Here, we report the functional characterization of the Arabidopsis thaliana homolog of the yeast NNF1/human PMF1 outer kinetochore protein and show that it has both kinetochore and non-kinetochore functions in plant growth and development. Knockout of NNF1 causes embryo lethality implying its essential role in cell division. AtNNF1 interacts with MIS12 in Y2H and co-immunoprecipitation assays, confirming it is one of the constituents of the plant MIS12 complex. GFP-NNF1 localizes to the kinetochore, rescuing the embryo lethal nnf1-1-/- phenotype, but the rescued plants (GFP-NNF1nnf1-/- ) are dwarf, displaying hypomorphic phenotypes with no evidence of mitotic or meiotic segregation defects. GFP-NNF1nnf1-/- dwarf plants have reduced levels of endogenous polyamines, which are partially rescued to wild-type levels upon exogenous application of polyamines. Mutations in the putative leucine zipper-like binding motif of NNF1 gave rise to a dominant-negative tall plant phenotype reminiscent of constitutive gibberellic acid (GA) action. These contrasting hypomorphic dwarf and antimorphic tall phenotypes facilitated us to attribute a moonlighting role to Arabidopsis NNF1 affecting polyamine and GA metabolism apart from its primary role in kinetochores.
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Affiliation(s)
- Sreejith Allipra
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER TVM), Maruthamala PO, Vithura, Thiruvananthapuram, Kerala, 695551, India
| | - Krishnapriya Anirudhan
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER TVM), Maruthamala PO, Vithura, Thiruvananthapuram, Kerala, 695551, India
| | - Siddharth Shivanandan
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER TVM), Maruthamala PO, Vithura, Thiruvananthapuram, Kerala, 695551, India
| | - Abhishek Raghunathan
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER TVM), Maruthamala PO, Vithura, Thiruvananthapuram, Kerala, 695551, India
| | - Ravi Maruthachalam
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER TVM), Maruthamala PO, Vithura, Thiruvananthapuram, Kerala, 695551, India
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23
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Chen P, Zhi F, Li X, Shen W, Yan M, He J, Bao C, Fan T, Zhou S, Ma F, Guan Q. Zinc-finger protein MdBBX7/MdCOL9, a target of MdMIEL1 E3 ligase, confers drought tolerance in apple. PLANT PHYSIOLOGY 2022; 188:540-559. [PMID: 34618120 PMCID: PMC8774816 DOI: 10.1093/plphys/kiab420] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 08/02/2021] [Indexed: 05/21/2023]
Abstract
Water deficit is one of the main challenges for apple (Malus × domestica) growth and productivity. Breeding drought-tolerant cultivars depends on a thorough understanding of the drought responses of apple trees. Here, we identified the zinc-finger protein B-BOX 7/CONSTANS-LIKE 9 (MdBBX7/MdCOL9), which plays a positive role in apple drought tolerance. The overexpression of MdBBX7 enhanced drought tolerance, whereas knocking down MdBBX7 expression reduced it. Chromatin immunoprecipitation-sequencing (ChIP-seq) analysis identified one cis-element of MdBBX7, CCTTG, as well as its known binding motif, the T/G box. ChIP-seq and RNA-seq identified 1,197 direct targets of MdBBX7, including ETHYLENE RESPONSE FACTOR (ERF1), EARLY RESPONSIVE TO DEHYDRATION 15 (ERD15), and GOLDEN2-LIKE 1 (GLK1) and these were further verified by ChIP-qPCR and electronic mobility shift assays. Yeast two-hybrid screen identified an interacting protein of MdBBX7, RING-type E3 ligase MYB30-INTERACTING E3 LIGASE 1 (MIEL1). Further examination revealed that MdMIEL1 could mediate the ubiquitination and degradation of MdBBX7 by the 26S proteasome pathway. Genetic interaction analysis suggested that MdMIEL1 acts as an upstream factor of MdBBX7. In addition, MdMIEL1 was a negative regulator of the apple drought stress response. Taken together, our results illustrate the molecular mechanisms by which the MdMIEL1-MdBBX7 module influences the response of apple to drought stress.
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Affiliation(s)
- Pengxiang Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Fang Zhi
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xuewei Li
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Wenyun Shen
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Mingjia Yan
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jieqiang He
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Chana Bao
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Tianle Fan
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Shuangxi Zhou
- The New Zealand Institute for Plant and Food Research Ltd., Hawke's Bay 4130, New Zealand
| | - Fengwang Ma
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Qingmei Guan
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China
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24
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Cao F, Li Z, Jiang L, Liu C, Qian Q, Yang F, Ma F, Guan Q. Genome-wide association study (GWAS) of leaf wax components of apple. STRESS BIOLOGY 2021; 1:13. [PMID: 37676571 PMCID: PMC10441854 DOI: 10.1007/s44154-021-00012-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 10/20/2021] [Indexed: 09/08/2023]
Abstract
The wax layer of apple leaves plays an important role in improving stress resistance, but relatively little is known about the mechanisms of wax synthesis and transport in apple leaves. In this study, 17 wax components, including alcohols, alkanes, fatty acids and terpenes, were analyzed by gas chromatography-tandem mass spectrometry (GC-MS) from the leaves of 123 apple germplasms. Whole-genome sequencing of these apple accessions yielded 5.9 million high-quality single nucleotide polymorphisms (SNPs). We performed a genome-wide association study (GWAS) on 17 wax components and identified several genes related to wax synthesis and transport, including MdSHN1 (SHINE1), MdLTP4 (LIPID TRANSFER PROTEIN4), MdWSD1 (WAX ESTER SYNTHASE/ACYL-COA DIAC-YLGLYCEROL ACYLTRANSFERASE1), MdRDR1 (RNA-DEPENDENT RNA POLYMERASE1), MdACBP6 (ACYL-COA-BINDING PROTEIN6), MdNLE (NOTCHLESS) and MdABCG21 (ATP-BINDING CASSETTE G21). Moreover, we identified some prominent SNPs that may affect gene expression and protein function. These results provide insights into mechanisms of wax synthesis and transport in apple leaves and broaden the genetic resources and basis for facilitating resistance breeding.
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Affiliation(s)
- Fuguo Cao
- Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, 712100, People's Republic of China
| | - Zhongxing Li
- Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, 712100, People's Republic of China
| | - Lijuan Jiang
- Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, 712100, People's Republic of China
| | - Chen Liu
- Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, 712100, People's Republic of China
| | - Qian Qian
- Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, 712100, People's Republic of China
| | - Feng Yang
- Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, 712100, People's Republic of China
| | - Fengwang Ma
- Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, 712100, People's Republic of China
| | - Qingmei Guan
- Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, 712100, People's Republic of China.
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25
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Jia B, Wang Y, Zhang D, Li W, Cui H, Jin J, Cai X, Shen Y, Wu S, Guo Y, Sun M, Sun X. Genome-Wide Identification, Characterization and Expression Analysis of Soybean CHYR Gene Family. Int J Mol Sci 2021; 22:12192. [PMID: 34830077 PMCID: PMC8625759 DOI: 10.3390/ijms222212192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/03/2021] [Accepted: 11/08/2021] [Indexed: 12/16/2022] Open
Abstract
The CHYR (CHY ZINC-FINGER AND RING FINGER PROTEIN) proteins have been functionally characterized in iron regulation and stress response in Arabidopsis, rice and Populus. However, their roles in soybean have not yet been systematically investigated. Here, in this study, 16 GmCHYR genes with conserved Zinc_ribbon, CHY zinc finger and Ring finger domains were obtained and divided into three groups. Moreover, additional 2-3 hemerythrin domains could be found in the N terminus of Group III. Phylogenetic and homology analysis of CHYRs in green plants indicated that three groups might originate from different ancestors. Expectedly, GmCHYR genes shared similar conserved domains/motifs distribution within the same group. Gene expression analysis uncovered their special expression patterns in different soybean tissues/organs and under various abiotic stresses. Group I and II members were mainly involved in salt and alkaline stresses. The expression of Group III members was induced/repressed by dehydration, salt and alkaline stresses, indicating their diverse roles in response to abiotic stress. In conclusion, our work will benefit for further revealing the biological roles of GmCHYRs.
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Affiliation(s)
- Bowei Jia
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
| | - Yan Wang
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
| | - Dajian Zhang
- State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Tai’an 271018, China;
| | - Wanhong Li
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
| | - Hongli Cui
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
| | - Jun Jin
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
| | - Xiaoxi Cai
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
| | - Yang Shen
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
| | - Shengyang Wu
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
| | - Yongxia Guo
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
| | - Mingzhe Sun
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
- Key Laboratory of Germplasm Enhancement, Physiology and Ecology of Food Crops in Cold Region, Ministry of Education, Northeast Agricultural University, Harbin 150030, China
| | - Xiaoli Sun
- Crop Stress Molecular Biology Laboratory, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China; (B.J.); (Y.W.); (W.L.); (H.C.); (J.J.); (X.C.); (Y.S.); (S.W.); (Y.G.)
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26
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Liu S, Tong M, Zhao L, Li X, Kunst L. The ARRE RING-Type E3 Ubiquitin Ligase Negatively Regulates Cuticular Wax Biosynthesis in Arabidopsis thaliana by Controlling ECERIFERUM1 and ECERIFERUM3 Protein Levels. FRONTIERS IN PLANT SCIENCE 2021; 12:752309. [PMID: 34764971 PMCID: PMC8576476 DOI: 10.3389/fpls.2021.752309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 09/28/2021] [Indexed: 06/01/2023]
Abstract
The outer epidermal cell walls of plant shoots are covered with a cuticle, a continuous lipid structure that provides protection from desiccation, UV light, pathogens, and insects. The cuticle is mostly composed of cutin and cuticular wax. Cuticular wax synthesis is synchronized with surface area expansion during plant development and is associated with plant responses to biotic and abiotic stresses. Cuticular wax deposition is tightly regulated by well-established transcriptional and post-transcriptional regulatory mechanisms, as well as post-translationally via the ubiquitin-26S proteasome system (UPS). The UPS is highly conserved in eukaryotes and involves the covalent attachment of polyubiquitin chains to the target protein by an E3 ligase, followed by the degradation of the modified protein by the 26S proteasome. A large number of E3 ligases are encoded in the Arabidopsis genome, but only a few have been implicated in the regulation of cuticular wax deposition. In this study, we have conducted an E3 ligase reverse genetic screen and identified a novel RING-type E3 ubiquitin ligase, AtARRE, which negatively regulates wax biosynthesis in Arabidopsis. Arabidopsis plants overexpressing AtARRE exhibit glossy stems and siliques, reduced fertility and fusion between aerial organs. Wax load and wax compositional analyses of AtARRE overexpressors showed that the alkane-forming branch of the wax biosynthetic pathway is affected. Co-expression of AtARRE and candidate target proteins involved in alkane formation in both Nicotiana benthamiana and stable Arabidopsis transgenic lines demonstrated that AtARRE controls the levels of wax biosynthetic enzymes ECERIFERUM1 (CER1) and ECERIFERUM3 (CER3). CER1 has also been confirmed to be a ubiquitination substrate of the AtARRE E3 ligase by an in vivo ubiquitination assay using a reconstituted Escherichia coli system. The AtARRE gene is expressed throughout the plant, with the highest expression detected in fully expanded rosette leaves and oldest stem internodes. AtARRE gene expression can also be induced by exposure to pathogens. These findings reveal that wax biosynthesis in mature plant tissues and in response to pathogen infection is controlled post-translationally.
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Affiliation(s)
- Shuang Liu
- Department of Botany, University of British Columbia, Vancouver, BC, Canada
| | - Meixuezi Tong
- Department of Botany, University of British Columbia, Vancouver, BC, Canada
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - Lifang Zhao
- Department of Botany, University of British Columbia, Vancouver, BC, Canada
| | - Xin Li
- Department of Botany, University of British Columbia, Vancouver, BC, Canada
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - Ljerka Kunst
- Department of Botany, University of British Columbia, Vancouver, BC, Canada
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27
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Xing D, Li T, Ma G, Ruan H, Gao L, Xia T. Transcriptome-Wide Analysis and Functional Verification of RING-Type Ubiquitin Ligase Involved in Tea Plant Stress Resistance. FRONTIERS IN PLANT SCIENCE 2021; 12:733287. [PMID: 34745167 PMCID: PMC8568054 DOI: 10.3389/fpls.2021.733287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 09/29/2021] [Indexed: 06/13/2023]
Abstract
The ubiquitin/26S proteasome pathway is a critical protein-degradation pathway in plant growth and development as well as in nearly all biological and abiotic stress processes. Although as a member of the ubiquitin/26S proteasome pathway, the E3 ubiquitin ligase family has been shown to be essential for the selective degradation of downstream target proteins, it has been rarely reported in tea plants (Camellia sinensis). In this study, through database searches and extensive manual deduplication, 335 RING finger family proteins were selected from the Tea Plant Information Archive. These proteins were divided into six categories by the difference of RING finger domain: RING-H2, RING-HCa, RING-HCb, RING-C2, RING-v, and RING-G. Stress-induced differential gene expression analysis showed that 53 proteins in RING finger family can respond to selected exogenous stress. In vitro ubiquitination assays indicated that TEA031033, which was named CsMIEL1, exhibited the activity of E3 ubiquitin ligases. CsMIEL1-overexpressing transgenic Arabidopsis thaliana seedlings were resistant to some exogenous abiotic stresses, such as salt and drought stress but sensitive to exogenous methyl jasmonate treatment. Furthermore, CsMIEL1 reduced the accumulation of anthocyanin in transgenic plants in response to low temperature treatment. The results of this article provide basic date for studying the role of ubiquitin/26S proteasome pathway in tea plants response to stresses.
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Affiliation(s)
- Dawei Xing
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, China
| | - Tongtong Li
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, China
| | - Guoliang Ma
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Haixiang Ruan
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Liping Gao
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Tao Xia
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, China
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28
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Gao Z, Sun B, Chen Z, Zhai H, Yao Y, Du Y. Phosphoproteomic analysis of ozone stress-responsive mechanisms in grapevine identifies KEG required for stress regulation. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2021; 311:111008. [PMID: 34482911 DOI: 10.1016/j.plantsci.2021.111008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 07/13/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
The environmental damage caused by ozone is of increasing concern globally. The phosphoproteomics approach was used to explore the mechanisms underlying grapevine tolerance to ozone stress and identify phosphoproteins altered by ozone treatment. Results revealed that 194 of 2275 quantitatively analyzed phosphoproteins were significantly regulated after ozone treatment. Biological pathways related to transport were significantly enriched by the differentially regulated phosphoproteins. Among these phosphoproteins, the phosphorylation of RING E3 ligase in grape (V. vinifera KEEP ON GOING, VvKEG) decreased after ozone treatment. Over-expression of VvKEG in Arabidopsis decreased abscisic acid (ABA) sensitivity and enhanced ozone tolerance. Furthermore, VvKEG interacted with the ABA-responsive transcription factor ABSCISIC ACID-INSENSITIVE3 (ABI3). The exogenous application of ABA on grapevine leaves significantly influenced chlorophyll fluorescence, chlorophyll, and malondialdehyde (MDA) contents under ozone treatment; however, treatment with 150 μmol ABA aggravated ozone stress. These results indicate that phosphorylation modification provides information on ozone-induced processes and that VvKEG plays a critical role in these processes via regulation of the ABA signaling pathway in grape.
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Affiliation(s)
- Zhen Gao
- State Key Laboratory of Crop Biology, Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production in Shandong, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Baozhen Sun
- State Key Laboratory of Crop Biology, Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production in Shandong, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Zhengwen Chen
- State Key Laboratory of Crop Biology, Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production in Shandong, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Heng Zhai
- State Key Laboratory of Crop Biology, Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production in Shandong, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Yuxin Yao
- State Key Laboratory of Crop Biology, Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production in Shandong, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Yuanpeng Du
- State Key Laboratory of Crop Biology, Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production in Shandong, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China.
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Lee HG, Seo PJ. Transcriptional activation of SUGAR TRANSPORT PROTEIN 13 mediates biotic and abiotic stress signaling. PLANT SIGNALING & BEHAVIOR 2021; 16:1920759. [PMID: 33899679 PMCID: PMC8244761 DOI: 10.1080/15592324.2021.1920759] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 04/17/2021] [Accepted: 04/19/2021] [Indexed: 05/22/2023]
Abstract
Plants have evolved elaborate physiological and molecular responses to diverse environmental challenges, including biotic and abiotic stresses. Accumulating evidence suggests that biotic and abiotic stress signaling pathways are intricately intertwined, and factors involved in molecular crosstalk between these pathways have been identified. The R2R3-type MYB96 transcription factor is a key player that mediates plant response to drought and osmotic stresses as well as to microbial pathogens, acting as a molecular signaling integrator. Here, we report that MYB96 is required for the transcriptional regulation of SUGAR TRANSPORT PROTEIN 13 (STP13) that lies at the intersection of abscisic acid (ABA) and defense signaling pathways. MYB96 directly binds to the STP13 promoter and activates gene expression upon exogenous application of ABA and bacterial flagellin peptide flg22. Our findings indicate that MYB96 integrates biotic and abiotic stress signals and possibly induces sugar uptake to confer tolerance to a wide range of adverse environmental challenges.
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Affiliation(s)
- Hong Gil Lee
- Department of Chemistry, Seoul National University, Seoul, Korea
- Plant Genomics and Breeding Institute, Seoul National University, Seoul, Korea
| | - Pil Joon Seo
- Department of Chemistry, Seoul National University, Seoul, Korea
- Plant Genomics and Breeding Institute, Seoul National University, Seoul, Korea
- CONTACT Pil Joon Seo Department of Chemistry, Seoul National University, Seoul08826, Korea
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30
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Liu B, Jiang Y, Tang H, Tong S, Lou S, Shao C, Zhang J, Song Y, Chen N, Bi H, Zhang H, Li J, Liu J, Liu H. The ubiquitin E3 ligase SR1 modulates the submergence response by degrading phosphorylated WRKY33 in Arabidopsis. THE PLANT CELL 2021; 33:1771-1789. [PMID: 33616649 PMCID: PMC8254483 DOI: 10.1093/plcell/koab062] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/08/2021] [Indexed: 05/06/2023]
Abstract
Oxygen deprivation caused by flooding activates acclimation responses to stress and restricts plant growth. After experiencing flooding stress, plants must restore normal growth; however, which genes are dynamically and precisely controlled by flooding stress remains largely unknown. Here, we show that the Arabidopsis thaliana ubiquitin E3 ligase SUBMERGENCE RESISTANT1 (SR1) regulates the stability of the transcription factor WRKY33 to modulate the submergence response. SR1 physically interacts with WRKY33 in vivo and in vitro and controls its ubiquitination and proteasomal degradation. Both the sr1 mutant and WRKY33 overexpressors exhibited enhanced submergence tolerance and enhanced expression of hypoxia-responsive genes. Genetic experiments showed that WRKY33 functions downstream of SR1 during the submergence response. Submergence induced the phosphorylation of WRKY33, which enhanced the activation of RAP2.2, a positive regulator of hypoxia-response genes. Phosphorylated WRKY33 and RAP2.2 were degraded by SR1 and the N-degron pathway during reoxygenation, respectively. Taken together, our findings reveal that the on-and-off module SR1-WRKY33-RAP2.2 is connected to the well-known N-degron pathway to regulate acclimation to submergence in Arabidopsis. These two different but related modulation cascades precisely balance submergence acclimation with normal plant growth.
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Affiliation(s)
- Bao Liu
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Yuanzhong Jiang
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Hu Tang
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Shaofei Tong
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Shangling Lou
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Chen Shao
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Junlin Zhang
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Yan Song
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Ningning Chen
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Hao Bi
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Han Zhang
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Junhua Li
- College of Life Sciences, Henan Normal University, Xinxiang 453007, China
| | - Jianquan Liu
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
| | - Huanhuan Liu
- Key Laboratory for Bio-resources and Eco-environment & State Key Lab of Hydraulics & Mountain River Engineering, College of Life Sciences, Sichuan University, Chengdu 610065, China
- Author for correspondence:
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Wang X, Niu Y, Zheng Y. Multiple Functions of MYB Transcription Factors in Abiotic Stress Responses. Int J Mol Sci 2021; 22:ijms22116125. [PMID: 34200125 PMCID: PMC8201141 DOI: 10.3390/ijms22116125] [Citation(s) in RCA: 153] [Impact Index Per Article: 51.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/20/2021] [Accepted: 05/25/2021] [Indexed: 01/25/2023] Open
Abstract
Plants face a more volatile environment than other organisms because of their immobility, and they have developed highly efficient mechanisms to adapt to stress conditions. Transcription factors, as an important part of the adaptation process, are activated by different signals and are responsible for the expression of stress-responsive genes. MYB transcription factors, as one of the most widespread transcription factor families in plants, participate in plant development and responses to stresses by combining with MYB cis-elements in promoters of target genes. MYB transcription factors have been extensively studied and have proven to be critical in the biosynthesis of secondary metabolites in plants, including anthocyanins, flavonols, and lignin. Multiple studies have now shown that MYB proteins play diverse roles in the responses to abiotic stresses, such as drought, salt, and cold stresses. However, the regulatory mechanism of MYB proteins in abiotic stresses is still not well understood. In this review, we will focus mainly on the function of Arabidopsis MYB transcription factors in abiotic stresses, especially how MYB proteins participate in these stress responses. We also pay attention to how the MYB proteins are regulated in these processes at both the transcript and protein levels.
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32
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Chen Z, Ly Vu J, Ly Vu B, Buitink J, Leprince O, Verdier J. Genome-Wide Association Studies of Seed Performance Traits in Response to Heat Stress in Medicago truncatula Uncover MIEL1 as a Regulator of Seed Germination Plasticity. FRONTIERS IN PLANT SCIENCE 2021; 12:673072. [PMID: 34149774 PMCID: PMC8213093 DOI: 10.3389/fpls.2021.673072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Accepted: 04/19/2021] [Indexed: 06/12/2023]
Abstract
Legume seeds are an important source of proteins, minerals, and vitamins for human and animal diets and represent a keystone for food security. With climate change and global warming, the production of grain legumes faces new challenges concerning seed vigor traits that allow the fast and homogenous establishment of the crop in a wide range of environments. These seed performance traits are regulated during seed maturation and are under the strong influence of the maternal environment. In this study, we used 200 natural Medicago truncatula accessions, a model species of legumes grown in optimal conditions and under moderate heat stress (26°C) during seed development and maturation. This moderate stress applied at flowering onwards impacted seed weight and germination capacity. Genome-wide association studies (GWAS) were performed to identify putative loci or genes involved in regulating seed traits and their plasticity in response to heat stress. We identified numerous significant quantitative trait nucleotides and potential candidate genes involved in regulating these traits under heat stress by using post-GWAS analyses combined with transcriptomic data. Out of them, MtMIEL1, a RING-type zinc finger family gene, was shown to be highly associated with germination speed in heat-stressed seeds. In Medicago, we highlighted that MtMIEL1 was transcriptionally regulated in heat-stressed seed production and that its expression profile was associated with germination speed in different Medicago accessions. Finally, a loss-of-function analysis of the Arabidopsis MIEL1 ortholog revealed its role as a regulator of germination plasticity of seeds in response to heat stress.
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Affiliation(s)
| | | | | | | | | | - Jerome Verdier
- Institut Agro, Univ Angers, INRAE, IRHS, SFR 4207 QuaSaV, Angers, France
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Karre S, Kim S, Samira R, Balint‐Kurti P. The maize ZmMIEL1 E3 ligase and ZmMYB83 transcription factor proteins interact and regulate the hypersensitive defence response. MOLECULAR PLANT PATHOLOGY 2021; 22:694-709. [PMID: 33825303 PMCID: PMC8126188 DOI: 10.1111/mpp.13057] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 02/24/2021] [Accepted: 03/08/2021] [Indexed: 05/10/2023]
Abstract
The plant hypersensitive response (HR), a rapid cell death at the point of pathogenesis, is mediated by nucleotide-binding site, leucine-rich repeat (NLR) resistance proteins (R-proteins) that recognize the presence of specific pathogen-derived proteins. Rp1-D21 is an autoactive maize NLR R-protein that triggers HR spontaneously. We previously mapped loci associated with variation in the strength of HR induced by Rp1-D21. Here we identify the E3 ligase ZmMIEL1 as the causal gene at a chromosome 10 modifier locus. Transient ZmMIEL1 expression in Nicotiana benthamiana reduced HR induced by Rp1-D21, while suppression of ZmMIEL1 expression in maize carrying Rp1-D21 increased HR. ZmMIEL1 also suppressed HR induced by another autoactive NLR, the Arabidopsis R-protein RPM1D505V, in N. benthamiana. We demonstrated that ZmMIEL1 is a functional E3 ligase and that the effect of ZmMIEL1 was dependent on the proteasome but also that levels of Rp1-D21 and RPM1D505V were not reduced when coexpressed with ZmMIEL1 in the N. benthamiana system. By comparison to a similar system in Arabidopsis, we identify ZmMYB83 as a potential target of ZmMIEL1. Suppression of ZmMYB83 expression in maize lines carrying Rp1-D21 suppressed HR. Suppression of ZmMIEL1 expression caused an increase in ZmMYB83 transcript and protein levels in N. benthamiana and maize. Using coimmunoprecipitation and bimolecular fluorescence complementation assays, we demonstrated that ZmMIEL1 and ZmMYB83 physically interacted. Additionally, ZmMYB83 and ZmMIEL1 regulated the expression of a set of maize very long chain fatty acid (VLCFA) biosynthetic genes that may be involved in regulating HR.
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Affiliation(s)
- Shailesh Karre
- Department of Entomology and Plant PathologyNC State UniversityRaleighNorth CarolinaUSA
| | - Saet‐Byul Kim
- Department of Entomology and Plant PathologyNC State UniversityRaleighNorth CarolinaUSA
| | - Rozalynne Samira
- Department of Entomology and Plant PathologyNC State UniversityRaleighNorth CarolinaUSA
- Fiber and Biopolymer Research InstituteDepartment of Plant and Soil ScienceTexas Tech UniversityLubbockTexasUSA
| | - Peter Balint‐Kurti
- Department of Entomology and Plant PathologyNC State UniversityRaleighNorth CarolinaUSA
- Plant Science Research Unit USDA‐ARSRaleighNorth CarolinaUSA
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Zhao X, Wen B, Li C, Liu L, Chen X, Li D, Li L, Fu X. PpEBB1 directly binds to the GCC box-like element of auxin biosynthesis related genes. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2021; 306:110874. [PMID: 33775370 DOI: 10.1016/j.plantsci.2021.110874] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 02/05/2021] [Accepted: 03/04/2021] [Indexed: 05/21/2023]
Abstract
EARLY BUD-BREAK 1 (EBB1) can promote bud break, and this function is likely conserved in woody plants. To get a more comprehensive understand of its function, peach (Prunus persica var. nectarina cultivar Zhongyou 4) PpEBB1 was overexpressed in Arabidopsis; the resultant phenotypes, including curved leaves, abnormal development of floral organs and low seed set, were similar to those of DORNRÖSCHEN-LIKE (DRNL) overexpression, indicating that PpEBB1 was a putative ortholog of AtDRNL. PpEBB1 bound to the GCC box-like element in the STYLISH1/SHI RELATED SEQUENCE5 (STY1/SRS5) promoter of peach, which has been proposed to occur in Arabidopsis as well. A GCC box-like element was also found in the YUCCA1 (YUC1) promoter, and PpEBB1 could bind to this element and activate the expression of YUC1. In addition to the elevated auxin content in the PpEBB1-oe plants as observed in our previous study, these results suggest that PpEBB1 can regulate auxin biosynthesis by directly activating related genes. Besides, we screened a zinc finger RING-finger protein, MYB30-INTERACTING E3 LIGASE 1 (PpMIEL1), showing interaction with PpEBB1, suggesting that the stability of PpEBB1 might be influenced by PpMIEL1 through ubiquitination.
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Affiliation(s)
- Xuehui Zhao
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271000, China; State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271000, China; Shandong Collaborative Innovation Center for Fruit & Vegetable Production With High Quality and Efficiency, Tai'an, Shandong, 271000, China
| | - Binbin Wen
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271000, China; State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271000, China; Shandong Collaborative Innovation Center for Fruit & Vegetable Production With High Quality and Efficiency, Tai'an, Shandong, 271000, China
| | - Chen Li
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271000, China; State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271000, China; Shandong Collaborative Innovation Center for Fruit & Vegetable Production With High Quality and Efficiency, Tai'an, Shandong, 271000, China
| | - Li Liu
- Shandong Academy of Agricultural Sciences, Jinan, Shandong, 250100, China
| | - Xiude Chen
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271000, China; State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271000, China; Shandong Collaborative Innovation Center for Fruit & Vegetable Production With High Quality and Efficiency, Tai'an, Shandong, 271000, China
| | - Dongmei Li
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271000, China; State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271000, China; Shandong Collaborative Innovation Center for Fruit & Vegetable Production With High Quality and Efficiency, Tai'an, Shandong, 271000, China
| | - Ling Li
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271000, China; State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271000, China; Shandong Collaborative Innovation Center for Fruit & Vegetable Production With High Quality and Efficiency, Tai'an, Shandong, 271000, China.
| | - Xiling Fu
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271000, China; State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271000, China; Shandong Collaborative Innovation Center for Fruit & Vegetable Production With High Quality and Efficiency, Tai'an, Shandong, 271000, China.
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35
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Sirko A, Wawrzyńska A, Brzywczy J, Sieńko M. Control of ABA Signaling and Crosstalk with Other Hormones by the Selective Degradation of Pathway Components. Int J Mol Sci 2021; 22:4638. [PMID: 33924944 PMCID: PMC8125534 DOI: 10.3390/ijms22094638] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 04/25/2021] [Accepted: 04/26/2021] [Indexed: 12/13/2022] Open
Abstract
A rapid and appropriate genetic and metabolic acclimation, which is crucial for plants' survival in a changing environment, is maintained due to the coordinated action of plant hormones and cellular degradation mechanisms influencing proteostasis. The plant hormone abscisic acid (ABA) rapidly accumulates in plants in response to environmental stress and plays a pivotal role in the reaction to various stimuli. Increasing evidence demonstrates a significant role of autophagy in controlling ABA signaling. This field has been extensively investigated and new discoveries are constantly being provided. We present updated information on the components of the ABA signaling pathway, particularly on transcription factors modified by different E3 ligases. Then, we focus on the role of selective autophagy in ABA pathway control and review novel evidence on the involvement of autophagy in different parts of the ABA signaling pathway that are important for crosstalk with other hormones, particularly cytokinins and brassinosteroids.
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Affiliation(s)
- Agnieszka Sirko
- Laboratory of Plant Protein Homeostasis, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, ul. Pawinskiego 5A, 02-106 Warsaw, Poland; (J.B.); (M.S.)
| | - Anna Wawrzyńska
- Laboratory of Plant Protein Homeostasis, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, ul. Pawinskiego 5A, 02-106 Warsaw, Poland; (J.B.); (M.S.)
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36
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An JP, Wang XF, Zhang XW, You CX, Hao YJ. Apple B-box protein BBX37 regulates jasmonic acid mediated cold tolerance through the JAZ-BBX37-ICE1-CBF pathway and undergoes MIEL1-mediated ubiquitination and degradation. THE NEW PHYTOLOGIST 2021; 229:2707-2729. [PMID: 33119890 DOI: 10.1111/nph.17050] [Citation(s) in RCA: 80] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 10/23/2020] [Indexed: 05/03/2023]
Abstract
The plant hormone jasmonic acid (JA) is involved in the cold stress response, and the inducer of CBF expression 1 (ICE1)- C-repeat binding factor (CBF) regulatory cascade plays a key role in the regulation of cold stress tolerance. In this study, we showed that a novel B-box (BBX) protein MdBBX37 positively regulates JA-mediated cold-stress resistance in apple. We found that MdBBX37 bound to the MdCBF1 and MdCBF4 promoters to activate their transcription, and also interacted with MdICE1 to enhance the transcriptional activity of MdICE1 on MdCBF1, thus promoting its cold tolerance. Two JA signaling repressors, MdJAZ1 and MdJAZ2 (JAZ, JAZMONATE ZIM-DOMAIN), interacted with MdBBX37 to repress the transcriptional activity of MdBBX37 on MdCBF1 and MdCBF4, and also interfered with the interaction between MdBBX37 and MdICE1, thus negatively regulating JA-mediated cold tolerance. E3 ligase MdMIEL1 (MIEL1, MYB30-Interacting E3 Ligase1) reduced MdBBX37-improved cold resistance by mediating ubiquitination and degradation of the MdBBX37 protein. The data reveal that MIEL1 and JAZ proteins co-regulate JA-mediated cold stress tolerance through the BBX37-ICE1-CBF module in apple. These results will aid further examination of the post-translational modification of BBX proteins and the regulatory mechanism of JA-mediated cold stress tolerance.
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Affiliation(s)
- Jian-Ping An
- State Key Laboratory of Crop Biology, Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, Shandong, 271018, China
| | - Xiao-Fei Wang
- State Key Laboratory of Crop Biology, Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, Shandong, 271018, China
| | - Xiao-Wei Zhang
- State Key Laboratory of Crop Biology, Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, Shandong, 271018, China
| | - Chun-Xiang You
- State Key Laboratory of Crop Biology, Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, Shandong, 271018, China
| | - Yu-Jin Hao
- State Key Laboratory of Crop Biology, Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, Shandong, 271018, China
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37
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Doroodian P, Hua Z. The Ubiquitin Switch in Plant Stress Response. PLANTS (BASEL, SWITZERLAND) 2021; 10:246. [PMID: 33514032 PMCID: PMC7911189 DOI: 10.3390/plants10020246] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 01/19/2021] [Accepted: 01/22/2021] [Indexed: 12/20/2022]
Abstract
Ubiquitin is a 76 amino acid polypeptide common to all eukaryotic organisms. It functions as a post-translationally modifying mark covalently linked to a large cohort of yet poorly defined protein substrates. The resulting ubiquitylated proteins can rapidly change their activities, cellular localization, or turnover through the 26S proteasome if they are no longer needed or are abnormal. Such a selective modification is essential to many signal transduction pathways particularly in those related to stress responses by rapidly enhancing or quenching output. Hence, this modification system, the so-called ubiquitin-26S proteasome system (UPS), has caught the attention in the plant research community over the last two decades for its roles in plant abiotic and biotic stress responses. Through direct or indirect mediation of plant hormones, the UPS selectively degrades key components in stress signaling to either negatively or positively regulate plant response to a given stimulus. As a result, a tightly regulated signaling network has become of much interest over the years. The ever-increasing changes of the global climate require both the development of new crops to cope with rapid changing environment and new knowledge to survey the dynamics of ecosystem. This review examines how the ubiquitin can switch and tune plant stress response and poses potential avenues to further explore this system.
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Affiliation(s)
- Paymon Doroodian
- Department of Environment and Plant Biology, Ohio University, Athens, OH 45701, USA;
- Molecular and Cellular Biology Program, Ohio University, Athens, OH 45701, USA
| | - Zhihua Hua
- Department of Environment and Plant Biology, Ohio University, Athens, OH 45701, USA;
- Molecular and Cellular Biology Program, Ohio University, Athens, OH 45701, USA
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38
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Li Q, Serio RJ, Schofield A, Liu H, Rasmussen SR, Hofius D, Stone SL. Arabidopsis RING-type E3 ubiquitin ligase XBAT35.2 promotes proteasome-dependent degradation of ACD11 to attenuate abiotic stress tolerance. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 104:1712-1723. [PMID: 33080095 DOI: 10.1111/tpj.15032] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 09/23/2020] [Accepted: 10/02/2020] [Indexed: 06/11/2023]
Abstract
Plants employ multiple mechanisms to cope with a constantly changing and challenging environment, including using the ubiquitin proteasome system (UPS) to alter their proteome to assist in initiating, modulating and terminating responses to stress. We previously reported that the ubiquitin ligase XBAT35.2 mediates the proteasome-dependent degradation of Accelerated Cell Death 11 (ACD11) to promote pathogen defense. Here, we demonstrate roles for XBAT35.2 and ACD11 in abiotic stress tolerance. As seen in response to pathogen infection, abiotic stress stabilizes XBAT35.2 and the abundance of ACD11 rose consistently with increasing concentrations of abscisic acid (ABA) and salt. Surprisingly, exposure to ABA and salt increased the stability of ACD11, and the overexpression of ACD11 improves plant survival of salt and drought stress, suggesting a role for ACD11 in promoting tolerance. Prolonged exposure to high concentrations of ABA or salt resulted in ubiquitination and the proteasome-dependent degradation of ACD11, however. The stress-induced turnover of ACD11 requires XBAT35.2, as degradation is slowed in the absence of the E3 ubiquitin ligase. Consistent with XBAT35.2 mediating the proteasome-dependent degradation of ACD11, the loss of E3 ubiquitin ligase function enhances the tolerance of salt and drought stress, whereas overexpression increases sensitivity. A model is presented where, upon the perception of abiotic stress, ACD11 abundance increases to promote tolerance. Meanwhile, XBAT35.2 accumulates and in turn promotes the degradation of ACD11 to attenuate the stress response. The results characterize XBAT35.2 as an E3 ubiquitin ligase with opposing roles in abiotic and biotic stress.
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Affiliation(s)
- Qiaomu Li
- Department of Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada
| | - Renata J Serio
- Department of Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada
| | - Andrew Schofield
- Department of Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada
| | - Hongxia Liu
- Department of Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada
| | - Sheena R Rasmussen
- Department of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, 756 51, Sweden
| | - Daniel Hofius
- Department of Plant Biology, Swedish University of Agricultural Sciences, Uppsala, 756 51, Sweden
| | - Sophia L Stone
- Department of Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada
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39
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Oh TR, Yu SG, Yang HW, Kim JH, Kim WT. AtKPNB1, an Arabidopsis importin-β protein, is downstream of the RING E3 ubiquitin ligase AtAIRP1 in the ABA-mediated drought stress response. PLANTA 2020; 252:93. [PMID: 33106936 DOI: 10.1007/s00425-020-03500-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 10/15/2020] [Indexed: 05/20/2023]
Abstract
AtKPNB1, an Arabidopsis importin-β protein, was regulated by AtAIRP1 E3 ubiquitin ligase, which intensified the ABA-mediated drought stress response. As an early step in the abscisic acid (ABA)-mediated drought response, the ABA signal is transduced into the nucleus, and thus the nuclear transport system is crucially involved in the drought stress response. AtKPNB1, an importin-β protein, which is a core component of nuclear transport, was previously reported to be a negative factor in the ABA-mediated drought stress response (Luo et al. Luo et al., Plant J 75:377-389, 2013). Here, we report that AtAIPR1, an Arabidopsis RING-type E3 ubiquitin (Ub) ligase, interacted with and ubiquitinated AtKPNB1. A null mutation of AtKPNB1 suppressed the ABA-insensitive germination phenotype of atairp1 mutant seedlings as compared to that of the wild-type plants. Furthermore, the ABA-insensitive stomatal closure and drought-susceptible phenotypes of atairp1 were rescued in atairp1atkpnb1 double mutant progeny, indicating that AtKPNB1 functions downstream of AtAIRP1. These data suggest that AtAIRP1 regulates the ABA-mediated drought response in Arabidopsis via ubiquitination of AtKPNB1.
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Affiliation(s)
- Tae Rin Oh
- Department of Systems Biology, Division of Life Science, Yonsei University, Seoul, 03722, Korea
- Institute of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Korea
| | - Seong Gwan Yu
- Department of Systems Biology, Division of Life Science, Yonsei University, Seoul, 03722, Korea
- Institute of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Korea
| | - Hee Woong Yang
- Department of Systems Biology, Division of Life Science, Yonsei University, Seoul, 03722, Korea
- Institute of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Korea
| | - Jong Hum Kim
- Department of Systems Biology, Division of Life Science, Yonsei University, Seoul, 03722, Korea
- Institute of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Korea
- Present address: Department of Energy, Plant Research Laboratory, Michigan State University, East Lansing, MI, 48824, USA
| | - Woo Taek Kim
- Department of Systems Biology, Division of Life Science, Yonsei University, Seoul, 03722, Korea.
- Institute of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Korea.
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Zhao CY, Xue HW. PI4Kγ2 Interacts with E3 Ligase MIEL1 to Regulate Auxin Metabolism and Root Development. PLANT PHYSIOLOGY 2020; 184:933-944. [PMID: 32788299 PMCID: PMC7536656 DOI: 10.1104/pp.20.00799] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 07/20/2020] [Indexed: 05/07/2023]
Abstract
Root development is important for normal plant growth and nutrient absorption. Studies have revealed the involvement of various factors in this complex process, improving our understanding of the relevant regulatory mechanisms. Here, we functionally characterize the role of Arabidopsis (Arabidopsis thaliana) phosphatidylinositol 4-kinase γ2 (PI4Kγ2) in root elongation regulation, which functions to modulate stability of the RING-type E3 ligase MYB30-INTERACTING E3 LIGASE1 (MIEL1) and auxin metabolism. Mutant plants deficient in PI4Kγ2 (pi4kγ2) exhibited a shortened root length and elongation zone due to reduced auxin level. PI4Kγ2 was shown to interact with MIEL1, regulating its degradation and furthering the stability of transcription factor MYB30 (which suppresses auxin metabolism by directly binding to promoter regions of GH3 2 and GH3 6). Interestingly, pi4kγ2 plants presented altered hypersensitive response, indicating that PI4Kγ2 regulates synergetic growth and defense of plants through modulating auxin metabolism. These results reveal the importance of protein interaction in regulating ubiquitin-mediated protein degradation in eukaryotic cells, and illustrate a mechanism coordinating plant growth and biotic stress response.
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Affiliation(s)
- Chun-Yan Zhao
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Hong-Wei Xue
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
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Joo H, Lim CW, Lee SC. The pepper RING-type E3 ligase, CaATIR1, positively regulates abscisic acid signalling and drought response by modulating the stability of CaATBZ1. PLANT, CELL & ENVIRONMENT 2020; 43:1911-1924. [PMID: 32421865 DOI: 10.1111/pce.13789] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 04/06/2020] [Accepted: 05/12/2020] [Indexed: 05/07/2023]
Abstract
Protein degradation by the ubiquitin/26S proteasome system is a critical process that modulates many eukaryotic cellular processes. E3 ligase usually modulates stress response by adjusting the stability of transcription factors. Previous studies have shown that a RING-type E3 ligase, CaASRF1, positively modulates abscisic acid (ABA) signalling and ABA-mediated drought response by modulating the stability of CaAIBZ1 and CaATBZ1. In this study, we conducted yeast two-hybrid (Y2H) screening with CaATBZ1 to isolate an additional modulator, identified as CaATIR1 (Capsicum annuum ATBZ1 Interacting RING finger protein 1). CaATIR1 has E3 ligase activity and promoted CaATBZ1 degradation using the 26S proteasome system. We investigated the loss-of and gain-of functions of this E3 ligase by using silencing pepper and overexpressing (OX) Arabidopsis plants, respectively. In response to ABA and drought treatments, CaATIR1-silenced pepper plants showed ABA insensitive and drought-sensitive phenotypes, while CaATIR1-OX plants showed the opposite phenotypes. Additionally, CaATBZ1-silencing rescued the ABA insensitive and drought-sensitive phenotypes of CaATIR1-silencing pepper plants. Taken together, these data demonstrate that the stability of CaATBZ1 mediated by CaATIR1 has a crucial role in drought stress signalling in pepper plants.
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Affiliation(s)
- Hyunhee Joo
- Department of Life Science (BK21 Program), Chung-Ang University, Seoul, Republic of Korea
| | - Chae Woo Lim
- Department of Life Science (BK21 Program), Chung-Ang University, Seoul, Republic of Korea
| | - Sung Chul Lee
- Department of Life Science (BK21 Program), Chung-Ang University, Seoul, Republic of Korea
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Yan Y, Li C, Dong X, Li H, Zhang D, Zhou Y, Jiang B, Peng J, Qin X, Cheng J, Wang X, Song P, Qi L, Zheng Y, Li B, Terzaghi W, Yang S, Guo Y, Li J. MYB30 Is a Key Negative Regulator of Arabidopsis Photomorphogenic Development That Promotes PIF4 and PIF5 Protein Accumulation in the Light. THE PLANT CELL 2020; 32:2196-2215. [PMID: 32371543 PMCID: PMC7346557 DOI: 10.1105/tpc.19.00645] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 04/03/2020] [Accepted: 04/29/2020] [Indexed: 05/03/2023]
Abstract
Phytochromes are red (R) and far-red (FR) light photoreceptors in plants, and PHYTOCHROME-INTERACTING FACTORS (PIFs) are a group of basic helix-loop-helix family transcription factors that play central roles in repressing photomorphogenesis. Here, we report that MYB30, an R2R3-MYB family transcription factor, acts as a negative regulator of photomorphogenesis in Arabidopsis (Arabidopsis thaliana). We show that MYB30 preferentially interacts with the Pfr (active) forms of the phytochrome A (phyA) and phytochrome B (phyB) holoproteins and that MYB30 levels are induced by phyA and phyB in the light. It was previously shown that phytochromes induce rapid phosphorylation and degradation of PIFs upon R light exposure. Our current data indicate that MYB30 promotes PIF4 and PIF5 protein reaccumulation under prolonged R light irradiation by directly binding to their promoters to induce their expression and by inhibiting the interaction of PIF4 and PIF5 with the Pfr form of phyB. In addition, our data indicate that MYB30 interacts with PIFs and that they act additively to repress photomorphogenesis. In summary, our study demonstrates that MYB30 negatively regulates Arabidopsis photomorphogenic development by acting to promote PIF4 and PIF5 protein accumulation under prolonged R light irradiation, thus providing new insights into the complicated but delicate control of PIFs in the responses of plants to their dynamic light environment.
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Affiliation(s)
- Yan Yan
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Cong Li
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Xiaojing Dong
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Hong Li
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Dun Zhang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Yangyang Zhou
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Bochen Jiang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Jing Peng
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Xinyan Qin
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Jinkui Cheng
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Xiaoji Wang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Pengyu Song
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Lijuan Qi
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Yuan Zheng
- Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Department of Biology, Henan University, Kaifeng 475001, China
| | - Bosheng Li
- Institute of Plant and Food Science, Department of Biology, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - William Terzaghi
- Department of Biology, Wilkes University, Wilkes-Barre, Pennsylvania 18766
| | - Shuhua Yang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Yan Guo
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Jigang Li
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
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Wang L, Yao W, Wang Y. The grape ubiquitin ligase VpRH2 is a negative regulator in response to ABA treatment. PLANTA 2020; 251:88. [PMID: 32222837 DOI: 10.1007/s00425-020-03382-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 03/20/2020] [Indexed: 06/10/2023]
Abstract
Ubiquitin ligase VpRH2 is a negative regulator in the grape ABA pathway by inhibiting ABL1, PYR1 and GRP2A expressions, and its promoter is inhibited by ABA treatment. In higher plants, ubiquitin ligases play key roles in various cellular processes. As in our previous study (Wang et al. in J Exp Bot 68:1669-1687, 2017), grape RING-H2-type ubiquitin ligase gene VpRH2 and its promoter was induced by powdery mildew and showed resistance to the disease. Diverse small-molecule hormones, like salicylic acid (SA), methyl jasmonate (MeJA) or abscisic acid (ABA), play pivotal roles in plant resistance. Here we found that VpRH2 expression could be induced by SA and MeJA treatment, but inhibited by ABA treatment. The promoter of VpRH2 revealed a similar variation trend under exogenous hormone treatments as the gene expression by GUS activity assay. By a series of deletion fragments, the promoter fragment of VpRH2-P656 to VpRH2-P513 was necessary in response to MeJA treatment, and the inhibition of ABA treatment to the VpRH2 promoter was independent of the ABRE motif. Over-expression of VpRH2 in Arabidopsis thaliana plants displayed ABA-insensitive phenotypes at the germination stage compared to wild type plants. In VpRH2 over-expressing Vitis vinifera cv. Thompson Seedless plants after ABA treatments, the expression of the ABA pathway related genes ABL1 and PYR1 showed a suppresive trend. Moreover, VpGRP2A (an VpRH2-interacting protein) also showed a suppresive trend in response to ABA treatment in VpRH2-overexpressing plants. Our results demonstrate that VpRH2 is a negative regulator in the grape ABA signal pathway by inhibiting ABL1, PYR1 and GRP2A expressions, and its promoter was also inhibited by ABA treatment.
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Affiliation(s)
- Lei Wang
- College of Horticulture, Northwest A and F University, No. 3 Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A and F University, Yangling, 712100, Shaanxi, People's Republic of China
| | - Wenkong Yao
- College of Horticulture, Northwest A and F University, No. 3 Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A and F University, Yangling, 712100, Shaanxi, People's Republic of China
| | - Yuejin Wang
- College of Horticulture, Northwest A and F University, No. 3 Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China.
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China.
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A and F University, Yangling, 712100, Shaanxi, People's Republic of China.
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Hou G, Du C, Gao H, Liu S, Sun W, Lu H, Kang J, Xie Y, Ma D, Wang C. Identification of microRNAs in developing wheat grain that are potentially involved in regulating grain characteristics and the response to nitrogen levels. BMC PLANT BIOLOGY 2020; 20:87. [PMID: 32103721 PMCID: PMC7045451 DOI: 10.1186/s12870-020-2296-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 02/20/2020] [Indexed: 05/20/2023]
Abstract
BACKGROUND MicroRNAs (miRNAs) play crucial roles in the regulation of plant development and growth, but little information is available concerning their roles during grain development under different nitrogen (N) application levels. Our objective was to identify miRNAs related to the regulation of grain characteristics and the response to different N fertilizer conditions. RESULTS A total of 79 miRNAs (46 known and 33 novel miRNAs) were identified that showed significant differential expression during grain development under both high nitrogen (HN) and low nitrogen (LN) treatments. The miRNAs that were significantly upregulated early in grain development target genes involved mainly in cell differentiation, auxin-activated signaling, and transcription, which may be associated with grain size; miRNAs abundant in the middle and later stages target genes mainly involved in carbohydrate and nitrogen metabolism, transport, and kinase activity and may be associated with grain filling. Additionally, we identified 50 miRNAs (22 known and 28 novel miRNAs), of which 11, 9, and 39 were differentially expressed between the HN and LN libraries at 7, 17, and 27 days after anthesis (DAA). The miRNAs that were differentially expressed in response to nitrogen conditions target genes involved mainly in carbohydrate and nitrogen metabolism, the defense response, and transport as well as genes that encode ubiquitin ligase. Only one novel miRNA (PC-5p-2614_215) was significantly upregulated in response to LN treatment at all three stages, and 21 miRNAs showed significant differential expression between HN and LN conditions only at 27 DAA. We therefore propose a model for target gene regulation by miRNAs during grain development with N-responsive patterns. CONCLUSIONS The potential targets of the identified miRNAs are related to various biological processes, such as carbohydrate/nitrogen metabolism, transcription, cellular differentiation, transport, and defense. Our results indicate that miRNA-mediated networks, via posttranscriptional regulation, play crucial roles in grain development and the N response, which determine wheat grain weight and quality. Our study provides useful information for future research of regulatory mechanisms that focus on improving grain yield and quality.
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Affiliation(s)
- Gege Hou
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Chenyang Du
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Honghuan Gao
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Sujun Liu
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Wan Sun
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Hongfang Lu
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Juan Kang
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Yingxin Xie
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Dongyun Ma
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China.
- The National Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou, 450002, China.
| | - Chenyang Wang
- College of Agronomy/National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China.
- The National Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou, 450002, China.
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An J, Wang X, Zhang X, Xu H, Bi S, You C, Hao Y. An apple MYB transcription factor regulates cold tolerance and anthocyanin accumulation and undergoes MIEL1-mediated degradation. PLANT BIOTECHNOLOGY JOURNAL 2020; 18:337-353. [PMID: 31250952 PMCID: PMC6953192 DOI: 10.1111/pbi.13201] [Citation(s) in RCA: 171] [Impact Index Per Article: 42.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/12/2019] [Accepted: 06/17/2019] [Indexed: 05/02/2023]
Abstract
MYB transcription factors (TFs) have been demonstrated to play diverse roles in plant growth and development through interaction with basic helix-loop-helix (bHLH) TFs. MdbHLH33, an apple bHLH TF, has been identified as a positive regulator in cold tolerance and anthocyanin accumulation by activating the expressions of MdCBF2 and MdDFR. In the present study, a MYB TF MdMYB308L was found to also positively regulate cold tolerance and anthocyanin accumulation in apple. We found that MdMYB308L interacted with MdbHLH33 and enhanced its binding to the promoters of MdCBF2 and MdDFR. In addition, an apple RING E3 ubiquitin ligase MYB30-INTERACTING E3 LIGASE 1 (MdMIEL1) was identified to be an MdMYB308L-interacting protein and promoted the ubiquitination degradation of MdMYB308L, thus negatively regulated cold tolerance and anthocyanin accumulation in apple. These results suggest that MdMYB308L acts as a positive regulator in cold tolerance and anthocyanin accumulation in apple by interacting with MdbHLH33 and undergoes MdMIEL1-mediated protein degradation. The dynamic change in MYB-bHLH protein complex seems to play a key role in the regulation of plant growth and development.
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Affiliation(s)
- Jian‐Ping An
- State Key Laboratory of Crop BiologyShandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and EfficiencyCollege of Horticulture Science and EngineeringShandong Agricultural UniversityTai‐An, ShandongChina
| | - Xiao‐Fei Wang
- State Key Laboratory of Crop BiologyShandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and EfficiencyCollege of Horticulture Science and EngineeringShandong Agricultural UniversityTai‐An, ShandongChina
| | - Xiao‐Wei Zhang
- State Key Laboratory of Crop BiologyShandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and EfficiencyCollege of Horticulture Science and EngineeringShandong Agricultural UniversityTai‐An, ShandongChina
| | - Hai‐Feng Xu
- State Key Laboratory of Crop BiologyShandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and EfficiencyCollege of Horticulture Science and EngineeringShandong Agricultural UniversityTai‐An, ShandongChina
| | - Si‐Qi Bi
- State Key Laboratory of Crop BiologyShandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and EfficiencyCollege of Horticulture Science and EngineeringShandong Agricultural UniversityTai‐An, ShandongChina
| | - Chun‐Xiang You
- State Key Laboratory of Crop BiologyShandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and EfficiencyCollege of Horticulture Science and EngineeringShandong Agricultural UniversityTai‐An, ShandongChina
| | - Yu‐Jin Hao
- State Key Laboratory of Crop BiologyShandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and EfficiencyCollege of Horticulture Science and EngineeringShandong Agricultural UniversityTai‐An, ShandongChina
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Diaz‐Granados A, Sterken MG, Overmars H, Ariaans R, Holterman M, Pokhare SS, Yuan Y, Pomp R, Finkers‐Tomczak A, Roosien J, Slootweg E, Elashry A, Grundler FM, Xiao F, Goverse A, Smant G. The effector GpRbp-1 of Globodera pallida targets a nuclear HECT E3 ubiquitin ligase to modulate gene expression in the host. MOLECULAR PLANT PATHOLOGY 2020; 21:66-82. [PMID: 31756029 PMCID: PMC6913204 DOI: 10.1111/mpp.12880] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Plant-parasitic nematodes secrete effectors that manipulate plant cell morphology and physiology to achieve host invasion and establish permanent feeding sites. Effectors from the highly expanded SPRYSEC (SPRY domain with a signal peptide for secretion) family in potato cyst nematodes have been implicated in activation and suppression of plant immunity, but the mechanisms underlying these activities remain largely unexplored. To study the host mechanisms used by SPRYSEC effectors, we identified plant targets of GpRbp-1 from the potato cyst nematode Globodera pallida. Here, we show that GpRbp-1 interacts in yeast and in planta with a functional potato homologue of the Homology to E6-AP C-Terminus (HECT)-type ubiquitin E3 ligase UPL3, which is located in the nucleus. Potato lines lacking StUPL3 are not available, but the Arabidopsis mutant upl3-5 displaying a reduced UPL3 expression showed a consistently small but not significant decrease in susceptibility to cyst nematodes. We observed a major impact on the root transcriptome by the lower levels of AtUPL3 in the upl3-5 mutant, but surprisingly only in association with infections by cyst nematodes. To our knowledge, this is the first example that a HECT-type ubiquitin E3 ligase is targeted by a pathogen effector and that a member of this class of proteins specifically regulates gene expression under biotic stress conditions. Together, our data suggest that GpRbp-1 targets a specific component of the plant ubiquitination machinery to manipulate the stress response in host cells.
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Affiliation(s)
| | - Mark G. Sterken
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
| | - Hein Overmars
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
| | - Roel Ariaans
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
| | - Martijn Holterman
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
| | - Somnath S. Pokhare
- Department of Molecular PhytomedicineUniversity of BonnBonnGermany
- ICAR National Rice Research InstituteCuttack753006India
| | - Yulin Yuan
- Department of Plant SciencesUniversity of IdahoMoscowUSA
| | - Rikus Pomp
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
| | - Anna Finkers‐Tomczak
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
- KeyGene N.V.WageningenNetherlands
| | - Jan Roosien
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
| | - Erik Slootweg
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
| | - Abdenaser Elashry
- Department of Molecular PhytomedicineUniversity of BonnBonnGermany
- Strube Research GmbHHauptstrasse 138387SöllingenGermany
| | | | - Fangming Xiao
- Department of Plant SciencesUniversity of IdahoMoscowUSA
| | - Aska Goverse
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
| | - Geert Smant
- Laboratory of NematologyWageningen University and ResearchWageningenNetherlands
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Kim TY, Lee SH, Ku H, Lee SY. Enhancement of Drought Tolerance in Cucumber Plants by Natural Carbon Materials. PLANTS 2019; 8:plants8110446. [PMID: 31652995 PMCID: PMC6918154 DOI: 10.3390/plants8110446] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 10/17/2019] [Accepted: 10/21/2019] [Indexed: 01/13/2023]
Abstract
Stress induced by climate change is a widespread and global phenomenon. Unexpected drought stress has a substantial effect on the growth and productivity of valuable crops. The effects of carbon materials on living organisms in response to abiotic stresses remain poorly understood. In this study, we proposed a new method for enhancing drought tolerance in cucumber (Cucumis sativus L.) using carbon nanotubes and natural carbon materials called shungite, which can be easily mixed into any soil. We analyzed the phenotype and physiological changes in cucumber plants grown under conditions of drought stress. Shungite-treated cucumber plants were healthier, with dark green leaves, than control plants when watering was withheld for 21 days. Furthermore, compared with the control cucumber group, in the shungite-treated plants, the monodehydroascorbate content of the leaf, which is a representative marker of oxidative damage, was 66% lower. In addition, major scavenger units of reactive oxygen species and related drought stress marker genes were significantly upregulated. These results indicate that successive pretreatment of soil with low-cost natural carbon material improved the tolerance of cucumber plants to drought stress.
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Affiliation(s)
- Tae Yoon Kim
- Department of Biomedical Engineering, Sogang University, Baekbeom-ro 35, Mapo-gu, Seoul 04107, Korea.
| | - Sang-Hyo Lee
- Department of Biomedical Engineering, Sogang University, Baekbeom-ro 35, Mapo-gu, Seoul 04107, Korea.
| | - Hara Ku
- Department of Biomedical Engineering, Sogang University, Baekbeom-ro 35, Mapo-gu, Seoul 04107, Korea.
| | - Seung-Yop Lee
- Department of Biomedical Engineering, Sogang University, Baekbeom-ro 35, Mapo-gu, Seoul 04107, Korea.
- Department of Mechanical Engineering, Sogang University, Baekbeom-ro 35, Mapo-gu, Seoul 04107, Korea.
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Millard PS, Kragelund BB, Burow M. R2R3 MYB Transcription Factors - Functions outside the DNA-Binding Domain. TRENDS IN PLANT SCIENCE 2019; 24:934-946. [PMID: 31358471 DOI: 10.1016/j.tplants.2019.07.003] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/02/2019] [Accepted: 07/05/2019] [Indexed: 05/20/2023]
Abstract
Several transcription factor (TF) families, including the MYB family, regulate a wide array of biological processes. TFs contain DNA-binding domains (DBDs) and regulatory regions; although information on protein structure is scarce for plant MYB TFs, various in silico methods suggest that the non-MYB regions contain extensive intrinsically disordered regions (IDRs). Although IDRs do not fold into stable globular structures, they comprise functional regions including interaction motifs, and recent research has shown that IDRs perform crucial biological roles. We map here domain organization, disorder predictions, and functional regions across the entire Arabidopsis thaliana R2R3 MYB TF family, and highlight where an increased research focus will be necessary to shape a new understanding of structure-function relationships in plant TFs.
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Affiliation(s)
- Peter S Millard
- DynaMo Center, Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark; Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Birthe B Kragelund
- Structural Biology and NMR Laboratory, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Meike Burow
- DynaMo Center, Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark; Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark.
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Kim H, Yu SI, Jung SH, Lee BH, Suh MC. The F-Box Protein SAGL1 and ECERIFERUM3 Regulate Cuticular Wax Biosynthesis in Response to Changes in Humidity in Arabidopsis. THE PLANT CELL 2019; 31:2223-2240. [PMID: 31320482 PMCID: PMC6751119 DOI: 10.1105/tpc.19.00152] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 06/04/2019] [Accepted: 07/12/2019] [Indexed: 05/21/2023]
Abstract
Cuticular waxes, which cover the aboveground parts of land plants, are essential for plant survival in terrestrial environments. However, little is known about the regulatory mechanisms underlying cuticular wax biosynthesis in response to changes in ambient humidity. Here, we report that the Arabidopsis (Arabidopsis thaliana) Kelch repeat F-box protein SMALL AND GLOSSY LEAVES1 (SAGL1) mediates proteasome-dependent degradation of ECERIFERUM3 (CER3), a biosynthetic enzyme involved in the production of very long chain alkanes (the major components of wax), thereby negatively regulating cuticular wax biosynthesis. Disruption of SAGL1 led to severe growth retardation, enhanced drought tolerance, and increased wax accumulation in stems, leaves, and roots. Cytoplasmic SAGL1 physically interacts with CER3 and targets it for degradation. β‑glucuronidase (GUS) expression was observed in the roots of pSAGL1:GUS plants but was barely detected in aerial organs. High humidity-induced GUS activity and SAGL1 transcript levels were reduced in response to abscisic acid treatment and water deficit. SAGL1 levels increase under high humidity, and the stability of this protein is regulated by the 26S proteasome. These findings indicate that the SAGL1-CER3 module negatively regulates cuticular wax biosynthesis in Arabidopsis in response to changes to humidity, and they highlight the importance of permeable cuticle formation in terrestrial plants under high humidity conditions.
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Affiliation(s)
- Hyojin Kim
- Department of Life Science, Sogang University, Seoul 04107, Republic of Korea
| | - Si-In Yu
- Department of Life Science, Sogang University, Seoul 04107, Republic of Korea
| | - Seh Hui Jung
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Byeong-Ha Lee
- Department of Life Science, Sogang University, Seoul 04107, Republic of Korea
| | - Mi Chung Suh
- Department of Life Science, Sogang University, Seoul 04107, Republic of Korea
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Arabidopsis BRUTUS-LIKE E3 ligases negatively regulate iron uptake by targeting transcription factor FIT for recycling. Proc Natl Acad Sci U S A 2019; 116:17584-17591. [PMID: 31413196 PMCID: PMC6717287 DOI: 10.1073/pnas.1907971116] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Mechanisms to balance the acquisition of sufficient Fe while preventing a toxic overload differ in bacteria, fungi, animals, and plants. Identification of specific E3 ligases acting directly on a key transcription factor for Fe uptake in Arabidopsis indicates how this balance is regulated in dicotyledonous plants. The domain structure and function of the E3 ligases show interesting parallels to a distantly related protein regulating Fe homeostasis in mammals. Moreover, the accumulation of Fe in weaker mutant alleles of the E3 ligases could be exploited for biofortification of crops. Organisms need to balance sufficient uptake of iron (Fe) with possible toxicity. In plant roots, a regulon of uptake genes is transcriptionally activated under Fe deficiency, but it is unknown how this response is inactivated when Fe becomes available. Here we describe the function of 2 partially redundant E3 ubiquitin ligases, BRUTUS-LIKE1 (BTSL1) and BTSL2, in Arabidopsis thaliana and provide evidence that they target the transcription factor FIT, a key regulator of Fe uptake, for degradation. The btsl double mutant failed to effectively down-regulate the transcription of genes controlled by FIT, and accumulated toxic levels of Fe in roots and leaves. The C-terminal domains of BTSL1 and BTSL2 exhibited E3 ligase activity, and interacted with FIT but not its dimeric partner bHLH39. The BTSL proteins were able to poly-ubiquitinate FIT in vitro and promote FIT degradation in vivo. Thus, posttranslational control of FIT is critical to prevent excess Fe uptake.
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