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The Role of GIGANTEA Gene in Mediating the Oxidative Stress Response and in Arabidopsis

机译：GIGANTEA基因在介导氧化应激反应和拟南芥中的作用

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The Arabidopsis GIGANTEA (GI) gene has been shown to be involved in the regulation of the oxidative stress response; however, little is known about the mechanism by which GI gene regulates the oxidative stress response. We show here that enhanced tolerance of the gi-3 mutant to oxidative stress is associated, at least in part, with constitutive activation of superoxide dismutase (SOD) and ascorbate peroxidase (APX) genes. The gi-3 plants were more tolerant to parquart (PQ) or hydrogen peroxide (H2O2)-mediated oxidative stress than wild-type plants. Analyses of concentrations of endogenous H2O2 and superoxide anion radicals as well as lipid peroxidation revealed that enhanced tolerance of gi-3 plants to oxidative stress was not due to defects in the uptake of PQ or the sequestration of PQ from its site of action, and that the gi-3 mutation alleviated oxidative damage of plant cells from PQ stress. Moreover, the gi-3 mutant showed constitutive activation of cytosolic Cu/ZnSOD and plastidic FeSOD as well as cytosolic APX1 and stromal APX genes, which at least in part contributed to constitutive increases in activities of anti-oxidative enzymes SOD and APX, respectively. To our knowledge, we demonstrate, for the first time, that GI gene regulates the oxidative stress response, at least in part, through modulation of SOD and APX genes.
机译：拟南芥的GIGANTEA（GI）基因已被证明参与氧化应激反应的调控。然而，关于GI基因调节氧化应激反应的机制知之甚少。我们在这里显示gi-3突变体对氧化应激的增强耐受性至少部分与超氧化物歧化酶（SOD）和抗坏血酸过氧化物酶（APX）基因的组成型激活相关。 gi-3植物比野生型植物更能耐受parquart（PQ）或过氧化氢（H2 O2 ）介导的氧化胁迫。内源性H2 O2 和超氧化物阴离子自由基的浓度以及脂质过氧化作用的分析表明，gi-3植物对氧化胁迫的耐受性增强不是由于PQ吸收缺陷或螯合PQ的作用部位，以及gi-3突变减轻了PQ胁迫对植物细胞的氧化损伤。此外，gi-3突变体显示出胞质Cu / ZnSOD和质体FeSOD以及胞质APX1和基质APX基因的组成性激活，这至少部分地分别导致了抗氧化酶SOD和APX活性的组成性增加。据我们所知，我们首次证明了GI基因至少部分地通过调节SOD和APX基因来调节氧化应激反应。

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