Hydrogen peroxide mediates high-intensity blue light-induced hypocotyl phototropism of cotton seedlings  

作　　者：Qian-yi Lv Qing-ping Zhao Chen Zhu Meichen Ding Fang-yuan Chu Xing-kun Li Kai Cheng Xiang Zhao 

机构地区：[1]National Key Laboratory of Cotton Bio-Breeding and Integrated Utilization,School of Life Sciences,Henan University,Kaifeng 475004,China [2]College of Life Science and Agricultural Engineering,Nanyang Normal University,1638 Wolong Road,Nanyang 473061,Henan,China

出　　处：《Stress Biology》2023年第1期300-313,共14页逆境生物学（英文）

基　　金：the financial support from the National Natural Science Foundation of China(Grant nos.32100225,32200252,31871419);the Natural Science Foundation of Henan province(grant nos.212300410214);Central Plain Talent Scheme(Grants.ZYYCYU202012164).

摘　　要：Phototropism is a classic adaptive growth response that helps plants to enhance light capture for photosynthesis.It was shown that hydrogen peroxide(H_(2)O_(2))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 H_(2)O_(2) in cotton hypocotyls.Disruption of the HBL-induced asymmetric distribution of H_(2)O_(2) by applying either H_(2)O_(2) itself evenly on the hypocotyls or H_(2)O_(2) scavengers on the lit side of hypocotyls could efficiently inhibit hypocotyl phototropic growth.Consistently,application of H_(2)O_(2) on the shaded and lit sides of the hypocotyls led to reduced and enhanced hypocotyl phototropism,respectively.Further,we show that H_(2)O_(2) inhibits hypocotyl elongation of cotton seedlings,thus supporting the repressive role of H_(2)O_(2) in HBL-induced hypocotyl phototropism.Moreover,our results show that H_(2)O_(2) interferes with HBL-induced asymmetric distribution of auxin in the cotton hypocotyls.Taken together,our study uncovers that H_(2)O_(2) changes the asymmetric accumulation of auxin and inhibits hypocotyl cell elongation,thus mediating HBL-induced hypocotyl phototropism.

关 键 词：Hydrogen peroxide High-intensity blue light Hypocotyl phototropism COTTON 

分 类 号：S562[农业科学—作物学]