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Li A, You T, Pang X, Wang Y, Tian L, Li X, Liu Z. Structural basis for an early stage of the photosystem II repair cycle in Chlamydomonas reinhardtii. Nat Commun 2024; 15:5211. [PMID: 38890314 PMCID: PMC11189392 DOI: 10.1038/s41467-024-49532-2] [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: 08/25/2023] [Accepted: 06/10/2024] [Indexed: 06/20/2024] Open
Abstract
Photosystem II (PSII) catalyzes water oxidation and plastoquinone reduction by utilizing light energy. It is highly susceptible to photodamage under high-light conditions and the damaged PSII needs to be restored through a process known as the PSII repair cycle. The detailed molecular mechanism underlying the PSII repair process remains mostly elusive. Here, we report biochemical and structural features of a PSII-repair intermediate complex, likely arrested at an early stage of the PSII repair process in the green alga Chlamydomonas reinhardtii. The complex contains three protein factors associated with a damaged PSII core, namely Thylakoid Enriched Factor 14 (TEF14), Photosystem II Repair Factor 1 (PRF1), and Photosystem II Repair Factor 2 (PRF2). TEF14, PRF1 and PRF2 may facilitate the release of the manganese-stabilizing protein PsbO, disassembly of peripheral light-harvesting complexes from PSII and blockage of the QB site, respectively. Moreover, an α-tocopherol quinone molecule is located adjacent to the heme group of cytochrome b559, potentially fulfilling a photoprotective role by preventing the generation of reactive oxygen species.
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Affiliation(s)
- Anjie Li
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Centre for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Tingting You
- Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, 310024, China
| | - Xiaojie Pang
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Yidi Wang
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Centre for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Lijin Tian
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Xiaobo Li
- Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, 310024, China.
- Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, 310024, China.
| | - Zhenfeng Liu
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Centre for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China.
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Fan S, Xu Y, Bai M, Luo F, Yu J, Yang G. Integrated Transcriptome and Metabolome Analysis Revealed the Causal Agent of Primary Bud Necrosis in 'Summer Black' Grape. Int J Mol Sci 2023; 24:10410. [PMID: 37373557 DOI: 10.3390/ijms241210410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
Primary bud necrosis of grape buds is a physiological disorder that leads to decreased berry yield and has a catastrophic impact on the double cropping system in sub-tropical areas. The pathogenic mechanisms and potential solutions remain unknown. In this study, the progression and irreversibility patterns of primary bud necrosis in 'Summer Black' were examined via staining and transmission electron microscopy observation. Primary bud necrosis was initiated at 60 days after bud break and was characterized by plasmolysis, mitochondrial swelling, and severe damage to other organelles. To reveal the underlying regulatory networks, winter buds were collected during primary bud necrosis progression for integrated transcriptome and metabolome analysis. The accumulation of reactive oxygen species and subsequent signaling cascades disrupted the regulation systems for cellular protein quality. ROS cascade reactions were related to mitochondrial stress that can lead to mitochondrial dysfunction, lipid peroxidation causing damage to membrane structure, and endoplasmic reticulum stress leading to misfolded protein aggregates. All these factors ultimately resulted in primary bud necrosis. Visible tissue browning was associated with the oxidation and decreased levels of flavonoids during primary bud necrosis, while the products of polyunsaturated fatty acids and stilbenes exhibited an increasing trend, leading to a shift in carbon flow from flavonoids to stilbene. Increased ethylene may be closely related to primary bud necrosis, while auxin accelerated cell growth and alleviated necrosis by co-chaperone VvP23-regulated redistribution of auxin in meristem cells. Altogether, this study provides important clues for further study on primary bud necrosis.
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Affiliation(s)
- Shaogang Fan
- College of Horticulture, Hunan Agricultural University, Changsha 410128, China
| | - Yanshuai Xu
- College of Horticulture, Hunan Agricultural University, Changsha 410128, China
| | - Miao Bai
- College of Horticulture, Hunan Agricultural University, Changsha 410128, China
| | - Feixiong Luo
- College of Horticulture, Hunan Agricultural University, Changsha 410128, China
| | - Jun Yu
- College of Horticulture, Hunan Agricultural University, Changsha 410128, China
| | - Guoshun Yang
- College of Horticulture, Hunan Agricultural University, Changsha 410128, China
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Jedličková V, Hejret V, Demko M, Jedlička P, Štefková M, Robert HS. Transcriptome analysis of thermomorphogenesis in ovules and during early seed development in Brassica napus. BMC Genomics 2023; 24:236. [PMID: 37142980 PMCID: PMC10158150 DOI: 10.1186/s12864-023-09316-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 04/16/2023] [Indexed: 05/06/2023] Open
Abstract
BACKGROUND Plant sexual reproduction is highly sensitive to elevated ambient temperatures, impacting seed development and production. We previously phenotyped this effect on three rapeseed cultivars (DH12075, Topas DH4079, and Westar). This work describes the transcriptional response associated with the phenotypic changes induced by heat stress during early seed development in Brassica napus. RESULTS We compared the differential transcriptional response in unfertilized ovules and seeds bearing embryos at 8-cell and globular developmental stages of the three cultivars exposed to high temperatures. We identified that all tissues and cultivars shared a common transcriptional response with the upregulation of genes linked to heat stress, protein folding and binding to heat shock proteins, and the downregulation of cell metabolism. The comparative analysis identified an enrichment for a response to reactive oxygen species (ROS) in the heat-tolerant cultivar Topas, correlating with the phenotypic changes. The highest heat-induced transcriptional response in Topas seeds was detected for genes encoding various peroxidases, temperature-induced lipocalin (TIL1), or protein SAG21/LEA5. On the contrary, the transcriptional response in the two heat-sensitive cultivars, DH12075 and Westar, was characterized by heat-induced cellular damages with the upregulation of genes involved in the photosynthesis and plant hormone signaling pathways. Particularly, the TIFY/JAZ genes involved in jasmonate signaling were induced by stress, specifically in ovules of heat-sensitive cultivars. Using a weighted gene co-expression network analysis (WGCNA), we identified key modules and hub genes involved in the heat stress response in studied tissues of either heat-tolerant or sensitive cultivars. CONCLUSIONS Our transcriptional analysis complements a previous phenotyping analysis by characterizing the growth response to elevated temperatures during early seed development and reveals the molecular mechanisms underlying the phenotypic response. The results demonstrated that response to ROS, seed photosynthesis, and hormonal regulation might be the critical factors for stress tolerance in oilseed rape.
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Affiliation(s)
- Veronika Jedličková
- Hormonal Crosstalk in Plant Development, Mendel Center for Plant Genomics and Proteomics, CEITEC MU-Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Václav Hejret
- Bioinformatics Core Facility, CEITEC MU-Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Martin Demko
- Bioinformatics Core Facility, CEITEC MU-Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Pavel Jedlička
- Department of Plant Developmental Genetics, Institute of Biophysics of the Czech Academy of Sciences, Brno, Czech Republic
| | - Marie Štefková
- Hormonal Crosstalk in Plant Development, Mendel Center for Plant Genomics and Proteomics, CEITEC MU-Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Hélène S Robert
- Hormonal Crosstalk in Plant Development, Mendel Center for Plant Genomics and Proteomics, CEITEC MU-Central European Institute of Technology, Masaryk University, Brno, Czech Republic.
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Kayoumu M, Iqbal A, Muhammad N, Li X, Li L, Wang X, Gui H, Qi Q, Ruan S, Guo R, Zhang X, Song M, Dong Q. Phosphorus Availability Affects the Photosynthesis and Antioxidant System of Contrasting Low-P-Tolerant Cotton Genotypes. Antioxidants (Basel) 2023; 12:antiox12020466. [PMID: 36830024 PMCID: PMC9952849 DOI: 10.3390/antiox12020466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 02/08/2023] [Accepted: 02/11/2023] [Indexed: 02/17/2023] Open
Abstract
Phosphorus (P) is an essential macronutrient, and an important component of plant metabolism. However, little is known about the effects of low P availability on P absorption, the photosynthetic electron transport chain, and the antioxidant system in cotton. This study used cotton genotypes (sensitive FJA and DLNTDH and tolerant BX014 and LuYuan343) with contrasting low-P tolerance in a hydroponic experiment under 15 µM, 50 µM, and 500 μM P concentrations. The results showed that low P availability reduced plant development and leaf area, shoot length, and dry weight in FJA and DLNADH, compared to BX014 and LuYuan343. The low P availability decreased the gas-exchange parameters such as the net photosynthetic rate, transpiration rate, and stomatal conductance, and increased the intercellular CO2 concentration. Chlorophyll a fluorescence demonstrated that the leaves' absorption and trapped-energy flux were largely steady. In contrast, considerable gains in absorption and trapped-energy flux per reaction center resulted from decreases in the electron transport per reaction center under low-P conditions. In addition, low P availability reduced the activities of antioxidant enzymes and increased the content of malondialdehyde in the cotton genotypes, especially in FJA and DLNTDH. Moreover, low P availability reduced the activity of PEPC and generated a decline in the content of ATP and NADPH. Our research can provide a theoretical physiological basis for the growth and tolerance of cotton under low-P conditions.
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Affiliation(s)
- Mirezhatijiang Kayoumu
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
| | - Asif Iqbal
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
- Western Agricultural Research Center of Chinese Academy of Agricultural Sciences, Changji 831100, China
- Department of Agriculture, Hazara University, Mansehra 21120, Pakistan
| | - Noor Muhammad
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
| | - Xiaotong Li
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
| | - Leilei Li
- Rice Cultivation Laboratory, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China
| | - Xiangru Wang
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
| | - Huiping Gui
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
| | - Qian Qi
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
| | - Sijia Ruan
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
| | - Ruishi Guo
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
| | - Xiling Zhang
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
- Correspondence: (X.Z.); (M.S.); (Q.D.); Tel.: +86-0372-2562-308 (Q.D.)
| | - Meizhen Song
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
- Western Agricultural Research Center of Chinese Academy of Agricultural Sciences, Changji 831100, China
- Correspondence: (X.Z.); (M.S.); (Q.D.); Tel.: +86-0372-2562-308 (Q.D.)
| | - Qiang Dong
- Institute of Cotton Research of Chinese Academy of Agricultural Sciences/Zhengzhou Research Base, State Key Laboratory of Cotton Biology/School of Agricultural Sciences, Zhengzhou University, Anyang 455000, China
- Western Agricultural Research Center of Chinese Academy of Agricultural Sciences, Changji 831100, China
- Correspondence: (X.Z.); (M.S.); (Q.D.); Tel.: +86-0372-2562-308 (Q.D.)
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