期刊
PHOTOSYNTHETICA
卷 60, 期 1, 页码 136-146出版社
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.32615/ps.2022.008
关键词
alternative electron flow; chlorophyll fluorescence; cyclic electron flows; freezing-induced desiccation; rehydration
资金
- Bulgarian National Science Fund, Ministry of Education and Science [KPi-06-H21/8]
It is found that alternative cyclic electron pathways play an important protective role during rehydration of desiccated leaves in Haberlea rhodopensis Friv., with the NDH-dependent pathway being crucial for the recovery of PSI.
Haberlea rhodopensis Friv. is unique with its ability to survive desiccation to an air-dry state during periods of extreme drought and freezing temperatures. To understand its survival strategies, it is important to examine the protective mechanisms not only during desiccation but also during rehydration. We investigated the involvement of alternative cyclic electron pathways during the recovery of photosynthetic functions after freezing-induced desiccation. Using electron transport inhibitors, the role of PGR5-dependent and NDH-dependent PSI-cyclic electron flows and plastid terminal oxidase were assessed during rehydration of desiccated leaves. Recovery of PSII and PSI, the capacity of PSI-driven cyclic electron flow, the redox state of plastoquinone pool, and the intersystem electron pool were analyzed. Data showed that the effect of alternative flows is more pronounced in the first hours of rehydration. In addition, the NDH-dependent cyclic pathway played a more determining role in the recovery of PSI than in the recovery of PSII.
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