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Multiple forms of vitamin B(6) regulate salt tolerance by balancing ROS and abscisic acid levels in maize root

作者：

Chongchong Lu;Yuan Tian;Xuanxuan Hou;Xin Hou;Zichang Jia;Min Li;Mingxia Hao;Yanke Jiang;Qingbin Wang;Qiong Pu;Ziyi Yin;Li Yang;Baoyou Liu;Xiaojing Kang;Guangyi Zhang;Xinhua Ding;Yinggao Li

关键词：

Abscisic acid;Reactive oxygen species;Salt stress;Vitamin B6;smk

摘要：

Salt stress causes osmotic stress, ion toxicity and oxidative stress, inducing the accumulation of abscisic acid (ABA) and excessive reactive oxygen species (ROS) production, which further damage cell structure and inhibit the development of roots in plants. Previous study showed that vitamin B(6) (VB(6)) plays a role in plant responses to salt stress, however, the regulatory relationship between ROS, VB(6) and ABA under salt stress remains unclear yet in plants. In our study, we found that salt stress-induced ABA accumulation requires ROS production, in addition, salt stress also promoted VB(6) (including pyridoxamine (PM), pyridoxal (PL), pyridoxine (PN), and pyridoxal 5′-phosphate (PLP)) accumulation, which involved in ROS scavenging and ABA biosynthesis. Furthermore, VB(6)-deficient maize mutant small kernel2 (smk2) heterozygous is more susceptible to salt stress, and which failed to scavenge excessive ROS effectively or induce ABA accumulation in maize root under salt stress, interestingly, which can be restored by exogenous PN and PLP, respectively. According to these results, we proposed that PN and PLP play an essential role in balancing ROS and ABA levels under salt stress, respectively, it laid a foundation for VB(6) to be better applied in crop salt resistance than ABA. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s44154-022-00061-2.

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Multiple forms of vitamin B(6) regulate salt tolerance by balancing ROS and abscisic acid levels in maize root

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