期刊
RUSSIAN JOURNAL OF PLANT PHYSIOLOGY
卷 65, 期 6, 页码 849-856出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1021443718060092
关键词
Zea mays; drought stress; delayed fluorescence; modulated 820 nm reflection; photosynthetic electron transport; prompt fluorescence
资金
- National Key Research and Development Program of China [2017YFD0300304]
- Modern Agricultural Industry Technology Research System [CARS-02-53]
To clarify how the components of the entire photosynthetic electron transport chain in response to drought stress in maize. The activities of photosystem II (PSII), photosystem I (PSI), and the electron transport chain between PSII and PSI of maize were investigated by prompt fluorescence (PF), delayed fluorescence (DF) and 820 nm modulated reflection (MR). Maize (Zea mays L.) plants were subjected to different levels of soil water availability including control, moderate and severe drought stress. A significant decrease in phi E-0, (0) and PIABS was found in maize treated with moderate drought stress. A significant increase in ABS/RC was observed, but there were no significant change in the fast MR phase and the amplitude of DF under moderate drought stress compared to the control. Under severe drought stress, the exchange capacity between Q(A) to Q(B), reoxidation capacity of plastoquinol, and the oxidation and re-reduction rates of PC and P-700 all decreased. These results demonstrated that moderate drought stress reduced the photochemical activity of PSII from Q(A) to PQH(2), while the photochemical activity of PSI was unscathed. However, severe drought stress inhibited the entire electron transport chain from the donor side of PSII to PSI-end electron acceptors. In addition, the photochemical activity of PSII is more sensitive to drought stress than PSI.
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