Ultraviolet-B Radiation (UV-B) Relieves Chilling-Light-Induced PSI Photoinhibition And Accelerates The Recovery Of CO2Assimilation 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 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 CO2assimilation 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.
State Key Lab of Crop Biology, Tai'an, Shandong Province, China.|College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018, China.|College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China.
Zi-Shan
ZS
Zhang
State Key Lab of Crop Biology, Tai'an, Shandong Province, China.|College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China.
Li-Qiao
LQ
Jin
State Key Lab of Crop Biology, Tai'an, Shandong Province, China.|College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China.
Yu-Ting
YT
Li
Plant Physiology and Molecular Biology, Department of Biochemistry and Food Chemistry, University of Turku, FIN-20014 Turku, Finland.
Mikko
M
Tikkanen
State Key Lab of Crop Biology, Tai'an, Shandong Province, China.|College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018, China.
Qing-Ming
QM
Li
State Key Lab of Crop Biology, Tai'an, Shandong Province, China.|College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018, China.
Xi-Zhen
XZ
Ai
State Key Lab of Crop Biology, Tai'an, Shandong Province, China.|College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China.
Hui-Yuan
HY
Gao
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