期刊
JOURNAL OF RADIATION RESEARCH
卷 52, 期 2, 页码 238-248出版社
OXFORD UNIV PRESS
DOI: 10.1269/jrr.10133
关键词
-
资金
- Ministry of Education, Science and Technology (MEST), Republic of Korea
- National Research Foundation of Korea [과06B1211] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Non-photochemical quenching/Reactive oxygen species/Ultraviolet-B/Xanthophyll cycle. To characterize a change in NPQ upon exposure to ultraviolet-B (UV-B), the xanthophyll cycle-dependent and -independent NPQs were compared in Cucumis swims, Lycopersicum esculentum, and Arabidopsis thaliana leaves. The xanthophyll cycle-dependent NPQ was dramatically but reversibly suppressed by UV-B radiation. This suppression was correlated more strongly with a marked decrease in photosynthetic electron transport rather than changes in xanthophyll cycle enzymes such as violaxanthin de-epoxidase and zeaxanthin epoxidase. Accordingly, the UV-B-induced suppression of NPQ cannot be attributed to changes in expressions of VDE and ZEP. However, suppression of the xanthophyll cycle-dependent NPQ could only account for the 77 K fluorescence emission spectra of thylakoid membranes and the increased level of O-1(2) production, but not for the decreased levels of center dot O-2(-) production and H2O2 scavenging. These results suggest that a gradual reduction of H2O2 scavenging activity as well as a transient and reversible suppression of thermal energy dissipation may contribute differentially to increased photooxidative damages in cucumber, tomato, and Arabidopsis plants after acute exposure to UV-B radiation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据