Beneficial Roles of 1-MCP on Regulation of Photosynthetic Electron Transport and Energy Dissipation in Chrysanthemum Under Heat Stress
1-Methyl cyclopropene (1-MCP) is known as an ethylene antagonist, yet its mechanisms in regulating photosynthetic electron transport and energy dissipation in chrysanthemum under heat stress are not well understood. Here, the chlorophyll a fluorescence and modulated 820 nm reflection transients were...
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2025-01-01
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| author | Runtian Miao Xiaoman Liu Yilin Zhao Yanli Zhao Han Dong Gan Huang Yonghua Li |
| author_facet | Runtian Miao Xiaoman Liu Yilin Zhao Yanli Zhao Han Dong Gan Huang Yonghua Li |
| author_sort | Runtian Miao |
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| description | 1-Methyl cyclopropene (1-MCP) is known as an ethylene antagonist, yet its mechanisms in regulating photosynthetic electron transport and energy dissipation in chrysanthemum under heat stress are not well understood. Here, the chlorophyll a fluorescence and modulated 820 nm reflection transients were analyzed in heat-tolerant and heat-sensitive chrysanthemum plants. This study demonstrates that 1-MCP pre-treatment helps maintain the net photosynthetic rate (P<sub>n</sub>) and the reaction center activity of photosystems I and II (PSI and PSII) during heat stress. Specifically, 1-MCP treatment significantly increases the fraction of active oxygen-evolving complex (OEC) centers and reduces relative variable fluorescence intensity at the J step (V<sub>J</sub>) as well as the efficiency of electron transfer at the PSI acceptor side (δ<sub>Ro</sub>). These effects mitigate damage to the photosynthetic electron transport chain. Additionally, 1-MCP-treated plants exhibit decreased quantum yield of energy dissipation (φ<sub>Do</sub>) and reduced energy flux per reaction center (DI<sub>o</sub>/RC). Overall, 1-MCP enhances light utilization efficiency and excitation energy dissipation in the PSII antennae, alleviating heat stress-induced damage to PSI and PSII structures and functions. This study not only advances our understanding of 1-MCP’s regulatory role in photosynthetic processes under heat stress but also provides a basis for using exogenous substances to improve chrysanthemum heat resistance. |
| format | Article |
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| institution | Kabale University |
| issn | 2311-7524 |
| language | English |
| publishDate | 2025-01-01 |
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| series | Horticulturae |
| spelling | doaj-art-d9562f4c62284db8a30abe6b5c6ffc8a2025-01-24T13:34:40ZengMDPI AGHorticulturae2311-75242025-01-011116810.3390/horticulturae11010068Beneficial Roles of 1-MCP on Regulation of Photosynthetic Electron Transport and Energy Dissipation in Chrysanthemum Under Heat StressRuntian Miao0Xiaoman Liu1Yilin Zhao2Yanli Zhao3Han Dong4Gan Huang5Yonghua Li6College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, ChinaCollege of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, ChinaCollege of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, ChinaKaifeng Academy of Agriculture and Forestry, Kaifeng 475004, ChinaCollege of Horticulture, Henan Agricultural University, Zhengzhou 450002, ChinaCollege of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, ChinaCollege of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China1-Methyl cyclopropene (1-MCP) is known as an ethylene antagonist, yet its mechanisms in regulating photosynthetic electron transport and energy dissipation in chrysanthemum under heat stress are not well understood. Here, the chlorophyll a fluorescence and modulated 820 nm reflection transients were analyzed in heat-tolerant and heat-sensitive chrysanthemum plants. This study demonstrates that 1-MCP pre-treatment helps maintain the net photosynthetic rate (P<sub>n</sub>) and the reaction center activity of photosystems I and II (PSI and PSII) during heat stress. Specifically, 1-MCP treatment significantly increases the fraction of active oxygen-evolving complex (OEC) centers and reduces relative variable fluorescence intensity at the J step (V<sub>J</sub>) as well as the efficiency of electron transfer at the PSI acceptor side (δ<sub>Ro</sub>). These effects mitigate damage to the photosynthetic electron transport chain. Additionally, 1-MCP-treated plants exhibit decreased quantum yield of energy dissipation (φ<sub>Do</sub>) and reduced energy flux per reaction center (DI<sub>o</sub>/RC). Overall, 1-MCP enhances light utilization efficiency and excitation energy dissipation in the PSII antennae, alleviating heat stress-induced damage to PSI and PSII structures and functions. This study not only advances our understanding of 1-MCP’s regulatory role in photosynthetic processes under heat stress but also provides a basis for using exogenous substances to improve chrysanthemum heat resistance.https://www.mdpi.com/2311-7524/11/1/681-methyl cyclopropeneheat stresschrysanthemumphotosystem Iphotosystem IIchlorophyll fluorescence |
| spellingShingle | Runtian Miao Xiaoman Liu Yilin Zhao Yanli Zhao Han Dong Gan Huang Yonghua Li Beneficial Roles of 1-MCP on Regulation of Photosynthetic Electron Transport and Energy Dissipation in Chrysanthemum Under Heat Stress Horticulturae 1-methyl cyclopropene heat stress chrysanthemum photosystem I photosystem II chlorophyll fluorescence |
| title | Beneficial Roles of 1-MCP on Regulation of Photosynthetic Electron Transport and Energy Dissipation in Chrysanthemum Under Heat Stress |
| title_full | Beneficial Roles of 1-MCP on Regulation of Photosynthetic Electron Transport and Energy Dissipation in Chrysanthemum Under Heat Stress |
| title_fullStr | Beneficial Roles of 1-MCP on Regulation of Photosynthetic Electron Transport and Energy Dissipation in Chrysanthemum Under Heat Stress |
| title_full_unstemmed | Beneficial Roles of 1-MCP on Regulation of Photosynthetic Electron Transport and Energy Dissipation in Chrysanthemum Under Heat Stress |
| title_short | Beneficial Roles of 1-MCP on Regulation of Photosynthetic Electron Transport and Energy Dissipation in Chrysanthemum Under Heat Stress |
| title_sort | beneficial roles of 1 mcp on regulation of photosynthetic electron transport and energy dissipation in chrysanthemum under heat stress |
| topic | 1-methyl cyclopropene heat stress chrysanthemum photosystem I photosystem II chlorophyll fluorescence |
| url | https://www.mdpi.com/2311-7524/11/1/68 |
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