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- Title
Stimulation of cyclic electron flow around PSI as a response to the combined stress of high light and high temperature in grape leaves.
- Authors
Sun, Yongjiang; Gao, Yulu; Wang, Hui; Yang, Xinghong; Zhai, Heng; Du, Yuanpeng
- Abstract
Changes in cyclic electron flow (CEF) around PSI activity after exposing grape (Vitis vinifera L.) seedling leaves to the combined stress of high temperature (HT) and high light (HL) were investigated. The PSII potential quantum efficiency (F v/ F m) decreased significantly under exposure to HT, and this decrease was greater when HT was combined with HL, whereas the PSI activity maintained stable. HT enhanced CEF mediated by NAD(P)H dehydrogenase remarkably. Compared with the control leaves, the half-time of P700+ re-reduction decreased during the HT treatment; this decrease was even more pronounced under the combined stress, implying significantly enhanced CEF as a result of the treatment. However, the heat-induced increase in nonphotochemical quenching (NPQ) was greater under HL, accompanied by a greater enhancement in high-energy state quenching. These results suggest that the combined stress of HT and HL resulted in severe PSII photoinhibition, whereas CEF showed plasticity in its response to environmental stress and played an important role in PSII and PSI photoprotection through accelerating generation of the thylakoid proton gradient and the induction of NPQ. Cyclic electron flow (CEF) has been identified as an important mechanism for photoprotection. We investigated the potential role of CEF in heated grape leaves under high light. Our findings provide insights into understanding the importance of CEF in protecting photosystems and will help to reveal the strategy of plants in adapting to changing environments.
- Subjects
PLANT photoinhibition; COMBINED stress (Engineering); GRAPES; PHOTOSYSTEMS; NADPH oxidase
- Publication
Functional Plant Biology, 2018, Vol 45, Issue 10, p1038
- ISSN
1445-4408
- Publication type
Article
- DOI
10.1071/FP17269