1. Hydrogen peroxide mediates high-intensity blue light-induced hypocotyl phototropism of cotton seedlings.
- Author
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Lv, Qian-yi, Zhao, Qing-ping, Zhu, Chen, Ding, Meichen, Chu, Fang-yuan, Li, Xing-kun, Cheng, Kai, and Zhao, Xiang
- Subjects
PHOTOTROPISM ,HYDROGEN peroxide ,DISTRIBUTION (Probability theory) ,BLUE light ,SEEDLINGS ,COTTON - Abstract
Phototropism is a classic adaptive growth response that helps plants to enhance light capture for photosynthesis. It was shown that hydrogen peroxide (H
2 O2 ) participates in the regulation of blue light-induced hypocotyl phototropism; however, the underlying mechanism is unclear. In this study, we demonstrate that the unilateral high-intensity blue light (HBL) could induce asymmetric distribution of H2 O2 in cotton hypocotyls. Disruption of the HBL-induced asymmetric distribution of H2 O2 by applying either H2 O2 itself evenly on the hypocotyls or H2 O2 scavengers on the lit side of hypocotyls could efficiently inhibit hypocotyl phototropic growth. Consistently, application of H2 O2 on the shaded and lit sides of the hypocotyls led to reduced and enhanced hypocotyl phototropism, respectively. Further, we show that H2 O2 inhibits hypocotyl elongation of cotton seedlings, thus supporting the repressive role of H2 O2 in HBL-induced hypocotyl phototropism. Moreover, our results show that H2 O2 interferes with HBL-induced asymmetric distribution of auxin in the cotton hypocotyls. Taken together, our study uncovers that H2 O2 changes the asymmetric accumulation of auxin and inhibits hypocotyl cell elongation, thus mediating HBL-induced hypocotyl phototropism. [ABSTRACT FROM AUTHOR]- Published
- 2023
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