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| Effects of short-term heat stress on PSII and subsequent recovery for senescent leaves of Vitis vinifera L. cv. Red Globe |
| ZHANG Kun1, 2, CHEN Bai-hong1, HAO Yan2, YANG Rui2, WANG Yu-an2 |
1 Horticulture College, Gansu Agricultural University, Lanzhou 730070, P.R.China
2 Institute of Fruit and Floriculture Research, Gansu Academy of Agricultural Sciences, Lanzhou 730070, P.R.China |
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Abstract Heat stress occurs frequently in energy-saving sunlight greenhouses (ESSG) at the late growth stage. Three-year delayed cultivation (DC) of the Red Globe cultivar of Vitis vinifera L. was used to clarify the physiological mechanisms of short-term heat stress on PSII and subsequent recovery from heat stress. By November, the photosynthetic function had declined and the fall in transpiration rate (E) with heating time increased the possibility of heat damage. In July, the most obvious increase was in the relative variable fluorescence at J point at 40°C, and in November it changed to K point. The 5 min of heat treatment resulted in a significant increase of the relative variable fluorescence at 0.3 ms (Wk), and after 10 min of heat treatment, the number of reactive centres per excited cross section (RC/CSo), probability that a trapped exciton moves an electron into the electron transport chain beyond QA– (at t=0) (Ψo) and quantum yield of electron transport at t=0 (φEo) decreased significantly (P<0.05), suggesting that the reaction centre, donor and acceptor side of photosystem II (PSII) were all significantly inhibited (P<0.05) and that the thermal stability of the photosynthetic mechanism was reduced. The inhibition of energy fluxes for senescent leaves in November was earlier and more pronounced than that for healthy leaves, which did not recover from heat stress of more than 15 min after 2 h recovery at room temperature.
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Received: 28 December 2017
Accepted:
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| Fund: This work was supported by the National Natural Science Foundation of China (31660585), the Experimental Station for Scientific Observation of Fruit Trees in the Northwest of China (10218020) and the earmarked fund for China Agriculture Research System (CARS-30-21). |
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Corresponding Authors:
Correspondence CHEN Bai-hong, Mobile: +86-13893210816, Fax: +86-931-7632155, E-mail: bhch@gsau.edu.cn
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| About author: ZHANG Kun, Mobile: +86-13909313637, E-mail: zhangkunchinaa@126.com; |
Cite this article:
ZHANG Kun, CHEN Bai-hong, HAO Yan, YANG Rui, WANG Yu-an.
2018.
Effects of short-term heat stress on PSII and subsequent recovery for senescent leaves of Vitis vinifera L. cv. Red Globe. Journal of Integrative Agriculture, 17(12): 2683-2693.
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