作物学报 ›› 2012, Vol. 38 ›› Issue (10): 1891-1899.doi: 10.3724/SP.J.1006.2012.01891
何永明1,林拥军2,曾晓春1,3,*
HE Yong-Ming1,LIN Yong-Jun2,ZENG Xiao-Chun1,3,*
摘要:
外源茉莉酸(JA)及其甲酯(MeJA)对水稻、小麦、黑麦和高粱等禾本科植物颖花开放具有强烈的诱导效应,然而内源JA是否参与颖花开放的调控目前还缺乏充分的证据。本研究应用高效液相色谱-串联质谱(HPLC-MS/MS)系统检测了粳稻武运粳7号和籼稻明恢63颖花自然开放过程中JA水平变化,并以实时定量反转录PCR (real-time RT-PCR)技术分析了武运粳7号颖花开放过程中JA生物合成途径关键基因表达变化。结果发现,水稻颖花JA水平的变化与开颖进程相一致。JA水平在上午颖花开颖前较平稳,开颖时急剧上升至峰值,闭颖后又下降。开颖时JA水平的峰值比开颖前1 h提高4~5倍。与JA水平变化相对应,催化JA生物合成途径关键步骤同工酶的编码基因OsDAD1-3、OsLOX-RCI1、OsAOS1、OsAOC和OsOPR7的表达在开颖时会有不同程度的上调,闭颖后又下调。同一稻穗上正在开放的颖花JA含量及上述JA生物合成途径基因的表达水平也比已开放和未开放的颖花高。颖花开放时JA水平及其生物合成基因表达的上升和闭颖后的下降有力地表明内源JA参与水稻颖花开放的调控。
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