Ultraviolet-B Radiation (UV-B) Relieves Chilling-Light-Induced PSI Photoinhibition And Accelerates The Recovery Of CO2 Assimilation In Cucumber (Cucumis sativus L.) Leaves

Ultraviolet-B radiation (UV-B) is generally considered to negatively impact the photosynthetic apparatus and plant growth. UV-B damages PSII but does not directly influence PSI. However, PSI and PSII successively drive photosynthetic electron transfer, therefore, the interaction between these system...

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Published in:Scientific reports 2016-09, Vol.6 (1), p.34455-34455, Article 34455
Main Authors: Zhang, Zi-Shan, Jin, Li-Qiao, Li, Yu-Ting, Tikkanen, Mikko, Li, Qing-Ming, Ai, Xi-Zhen, Gao, Hui-Yuan
Format: Article
Language:English
Subjects:
631/449/1734/2075
631/449/2661/2665
Biological assimilation
Carbon dioxide
Chilling
Electron transfer
Humanities and Social Sciences
Inactivation
Irradiation
Leaves
Light
multidisciplinary
Photoinhibition
Photosynthetic apparatus
Photosystem II
Plant growth
Science
Sunlight
Ultraviolet radiation
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Summary:Ultraviolet-B radiation (UV-B) is generally considered to negatively impact the photosynthetic apparatus and plant growth. UV-B damages PSII but does not directly influence PSI. However, PSI and PSII successively drive photosynthetic electron transfer, therefore, the interaction between these systems is unavoidable. So we speculated that UV-B could indirectly affect PSI under chilling-light conditions. To test this hypothesis, the cucumber leaves were illuminated by UV-B prior or during the chilling-light treatment and the leaves were then transferred to 25 °C and low-light conditions for recovery. The results showed that UV-B decreased the electron transfer to PSI by inactivating the oxygen-evolving complex (OEC), thereby protecting PSI from chilling-light-induced photoinhibition. This effect advantages the recoveries of PSI and CO 2 assimilation after chilling-light stress, therefore should minimize the yield loss caused by chilling-light stress. Because sunlight consists of both UV-B and visible light, we suggest that UV-B-induced OEC inactivation is critical for chilling-light-induced PSI photoinhibition in field. Moreover, additional UV-B irradiation is an effective strategy to relieve PSI photoinhibition and yield loss in protected cultivation during winter. This study also demonstrates that minimizing the photoinhibition of PSI rather than that of PSII is essential for the chilling-light tolerance of the plant photosynthetic apparatus.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep34455