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Nitric oxide suppresses the inhibitory effect of abscisic acid on seed germination by S-nitrosylation of SnRK2 proteins

机译:一氧化氮通过SnRK2蛋白的S-亚硝基化抑制脱落酸对种子发芽的抑制作用

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摘要

Nitric oxide (NO) plays important roles in plant development, and biotic and abiotic stress responses. In a recent study, we showed that endogenous NO negatively regulates abscisic acid (ABA) signaling in guard cells by inhibiting sucrose nonfermenting 1 (SNF1)-related protein kinase 2.6 (SnRK2.6)/open stomata 1(OST1) through S-nitrosylation. Application of NO breaks seed dormancy and alleviates the inhibitory effect of ABA on seed germination and early seedling growth, but it is unclear how NO functions at the stages of seed germination and early seedling development. Here, we show that like SnRK2.6, SnRK2.2 can be inactivated by S-nitrosoglutathione (GSNO) treatment through S-nitrosylation. SnRK2.2 and the closely related SnRK2.3 are known to play redundant roles in ABA inhibition of seed germination in Arabidopsis. We found that treatment with the NO donor SNP phenocopies the snrk2.2snrk2.3 double mutant in conferring ABA insensitivity at the stages of seed germination and early seedling growth. Our results suggest that NO negatively regulates ABA signaling in germination and early seedling growth through S-nitrosylation of SnRK2.2 and SnRK2.3.
机译:一氧化氮(NO)在植物发育以及生物和非生物胁迫响应中发挥重要作用。在最近的一项研究中,我们表明内源性NO通过抑制S-亚硝基化作用抑制蔗糖非发酵1(SNF1)相关蛋白激酶2.6(SnRK2.6)/开放气孔1(OST1),从而在保卫细胞中负调控脱落酸(ABA)信号传导。 。 NO的施用打破了种子的休眠状态,减轻了ABA对种子发芽和幼苗早期生长的抑制作用,但目前尚不清楚NO在种子发芽和幼苗早期阶段的功能。在这里,我们表明,像SnRK2.6一样,SnRK2.2可以通过S-亚硝基化通过S-亚硝基谷胱甘肽(GSNO)处理而失活。已知SnRK2.2和密切相关的SnRK2.3在ABA抑制拟南芥种子萌发中起多余的作用。我们发现,用NO供体SNP表型处理了snrk2.2snrk2.3双突变体,从而在种子发芽和幼苗早期生长阶段赋予了ABA不敏感性。我们的结果表明,NO通过SnRK2.2和SnRK2.3的S-亚硝基化对发芽和幼苗早期生长中的ABA信号负调控。

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