Xanthophyll Cycle and Inactivation of Photosystem II Reaction Centers Alleviating Reducing Pressure to Photosystem I in Morning Glory Leaves under Short-term High Irradiance

文献类型： 外文期刊

第一作者： Li, Xin-Guo

作者： Li, Xin-Guo;Li, Jian-Yong;Zhao, Jin-Ping;Xu, Ping-Li;He, Qi-Wei

作者机构：

关键词： D1 protein;high irradiance;morning glory;photoinhibition;xanthophyll cycle

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

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年卷期：

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收录情况： SCI

摘要： Under 30-min high irradiance (1500 mu mol m~(-2) s~(-1)), the roles of the xanthophyll cycle and D1 protein turnover wereinvestigated through chlorophyll fluorescence parameters in morning glory (Ipomoea setosa) leaves, which were dippedinto water, dithiothreitol (DTT) and lincomycin (LM), respectively. During the stress, both the xanthophyll cycle and D1protein turnover could protect PSI from photoinhibition. In DTT leaves, non-photochemical quenching (NPQ) was inhibitedgreatly and the oxidation level of P700 (P700+) was the lowest one. However, the maximal photochemical efficiency of PSII(Fv/Fm) in DTT leaves was higher than that of LM leaves and was lower than that of control leaves. These results suggestedthat PSI was more sensitive to the loss of the xanthophyll cycle than PSII under high irradiance. In LM leaves, NPQ waspartly inhibited, Fv/Fm was the lowest one among three treatments under high irradiance and P700+ was at a similar levelas that of control leaves. These results implied that inactivation of PSII reaction centers could protect PSI from furtherphotoinhibition. Additionally, the lowest of the number of active reaction centers to one inactive reaction center for a PSIIcross-section (RC/CSo), maximal trapping rate in a PSII cross-section (TRo/CSo), electron transport in a PSII cross-section(ETo/CSo) and the highest of 1-qP in LM leaves further indicated that severe photoinhibition of PSII in LM leaves wasmainly induced by inactivation of PSII reaction centers, which limited electrons transporting to PSI. However, relative tothe LM leaves the higher level of RG/CSo, TRo/CSo, Fv/Fm and the lower level of 1-qP in DTT leaves indicated that PSIphotoinhibition was mainly induced by the electron accumulation at the PSI acceptor side, which induced the decrease ofP700+ under high irradiance.

分类号： Q94

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