作物学报 ›› 2012, Vol. 38 ›› Issue (11): 1988-1996.doi: 10.3724/SP.J.1006.2012.01988
孙波1,周勇1,林拥军1,*
SUN Bo,ZHOU Yong,LIN Yong-Jun*
摘要:
叶片衰老是其发育的最后阶段。通过对水稻叶片衰老机制的研究, 有计划地控制或延缓衰老的发生具有重要的理论价值和实践意义。本研究基于基因表达芯片数据挑选了一个叶片衰老上调表达候选基因A12 (LOC_Os 07g41230)。A12基因在水稻全生育期表达谱数据库中的表达模式及在水稻抽穗后不同时期剑叶中的表达量检测结果进一步证明其确为叶片衰老上调表达基因。生物信息学预测A12基因启动子区域存在大量的与激素诱导相关的顺式作用元件。实时定量PCR结果显示A12基因对茉莉酸(JA)和激动素(KT)的诱导有明显的响应, 但是对油菜素内酯(BR)、赤霉素(GA)、生长素(IAA)及脱落酸(ABA)的诱导则无明显响应。对A12基因对应的水稻T-DNA插入突变体观察发现, A12基因的突变会导致剑叶早衰。这些结果为进一步深入研究A12基因的生物学功能打下了基础。
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