Impairment of Sulfite Reductase Decreases Oxidative Stress Tolerance in Arabidopsis thaliana.

ABSTRACT: As an essential enzyme in the sulfate assimilation reductive pathway, sulfite reductase (SiR) plays important roles in diverse metabolic processes such as sulfur homeostasis and cysteine metabolism. However, whether plant SiR is involved in oxidative stress response is largely unknown. Here, we show that SiR functions in methyl viologen (MV)-induced oxidative stress in Arabidopsis. The transcript levels of SiR were higher in leaves, immature siliques, and roots and were markedly and rapidly up-regulated by MV exposure. The SiR knock-down transgenic lines had about 60% residual transcripts and were more susceptible than wild-type when exposed to oxidative stress. The severe damage phenotypes of the SiR-impaired lines were accompanied by increases of

SUBMITTER: Wang M 

PROVIDER: S-EPMC5133253 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature