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赤霉素调节植物对非生物逆境的耐性

DOI: 10.1360/052013-321, PP. 1119-1126

Keywords: 赤霉素,脱落酸,非生物逆境,EUI1基因,水稻,拟南芥

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Abstract:

赤霉素(GAs)是一类重要的植物激素,调控植物生长发育的诸多方面.最近的研究表明,GA也参与对生物与非生物胁迫的响应,然而GA参与非生物胁迫响应的遗传学证据及其机制有待于进一步研究.本实验室前期研究证明,水稻EUI1(ELONGATEDUPPERMOSTINTERNODE)通过一个新的生化途径降解体内的活性赤霉素分子,并参与调控水稻对病原菌的基础抗病性.本研究发现,eui1突变体对盐胁迫能力降低,而超表达EUI1基因的水稻和拟南芥耐盐性显著提高.进一步研究发现,积累高含量赤霉素的水稻eui1突变体对脱落酸(ABA)的敏感性下降,而赤霉素缺失的EUI1超表达转基因水稻和拟南芥均改变了对于ABA的敏感性.EUI1基因的转录受逆境诱导,其功能缺失与超表达调控了逆境标志基因的表达.综上推测,GA可能是通过影响ABA的信号途径从而改变了植物对非生物胁迫的响应.

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