Thiobencarb herbicide reduces growth, photosynthetic activity, and amount of Rieske iron-sulfur protein in the diatom Thalassiosira pseudonana

Yohei Shimasaki, Michito Tsuyama, Rumana Tasmin, Xuchun Qiu, Motoyuki Shimizu, Yusuke Sato, Yasuhiro Yamasaki, Yoko Kato-Unoki, Atsushi Nukata, Takashi Nakashima, Hirofumi Ichinose, Hiroyuki Wariishi, Tsuneo Honjo, Yuji Oshima
Journal of Biochemical and Molecular Toxicology 2013, 27 (9): 437-44
We investigated the effects of the herbicide thiobencarb on the growth, photosynthetic activity, and expression profile of photosynthesis-related proteins in the marine diatom Thalassiosira pseudonana. Growth rate was suppressed by 50% at a thiobencarb concentration of 1.26 mg/L. Growth and photosystem II activity (Fv /Fm ratio) were drastically decreased at 5 mg/L, at which the expression levels of 13 proteins increased significantly and those of 11 proteins decreased significantly. Among these proteins, the level of the Rieske iron-sulfur protein was decreased to less than half of the control level. This protein is an essential component of the cytochrome b6 f complex in the photosynthetic electron transport chain. Although the mechanism by which thiobencarb decreased the Rieske iron-sulfur protein level is not clear, these results suggest that growth was inhibited by interruption of the photosynthetic electron transport chain by thiobencarb.

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