Singlet Oxygen-Induced Cell Death in Arabidopsis under High-Light Stress Is Controlled by OXI1 Kinase

摘要: Studies of the singlet oxygen ((1)O2)-overproducing flu and chlorina1 (ch1) mutants Arabidopsis (Arabidopsis thaliana) have shown that (1)O2-induced changes in gene expression can lead to either programmed cell death (PCD) or acclimation. A transcriptomic analysis ch1 mutant has allowed identification genes whose is specifically affected by each phenomenon. One such OXIDATIVE SIGNAL INDUCIBLE1 (OXI1) encoding an AGC kinase was noticeably induced excess light energy (1)O2 stress conditions leading death. Photo-induced oxidative damage were drastically reduced OXI1 null (oxi1) double ch1*oxi1 compared with wild type single mutant, respectively. This occurred without any production rate but cancelled exogenous applications phytohormone jasmonate. OXI1-mediated signaling appeared operate through a different pathway from previously characterized OXI1-dependent response pathogens H2O2 found be independent EXECUTER proteins. In high-light-stressed plants, oxi1 mutation associated jasmonate levels up-regulation negative regulators PCD. Our results show new regulator PCD, likely acting upstream