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Li, Yu-Ting; Liang, Ying; Li, Yue-Nan; Che, Xing-Kai; Zhao, Shi-Jie; Zhang, Zi-Shan; Gao, Hui-Yuan
Scientific reports, 03/2018, Letnik: 8, Številka: 1Journal Article
Bisphenol A (BPA), a widely distributed pollutant, suppresses photosynthesis in leaves. In previous studies on higher plants, the plants were treated by BPA through irrigation to root. This method cannot distinguish whether the BPA directly suppresses photosynthesis in leaves, or indirectly influences photosynthesis through affecting the function of root. Here, only the leaves but not the roots of cucumber were infiltrated with BPA solution. The photosystem II and I (PSII, PSI) were insensitive to BPA under darkness. BPA aggravated the PSII but not the PSI photoinhibition under light. BPA also inhibited CO assimilation, and the effect of BPA on PSII photoinhibition disappeared when the CO assimilation was blocked. The H O accumulated in BPA-treated leaves under light. And the BPA-caused PSII photoinhibition was prevented under low (2%) O . We also proved that the BPA-caused PSII photoinhibition depend on the turnover of D1 protein. In conclusion, this study proved that BPA could directly suppress photosynthesis in leaves, however, BPA does not damage PSII directly, but inhibits CO assimilation and over-reduces the electron transport chain under light, which increases the production of reactive oxygen species (H O ), the over-accumulated ROS inhibits the turnover of D1 protein and consequently aggravates PSII photoinhibition.
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