作物学报 ›› 2014, Vol. 40 ›› Issue (05): 769-778.doi: 10.3724/SP.J.1006.2014.00769
毛节景1,赵晨晨1,黄福灯2,潘刚1,*,程方民1,*
MAO Jie-Jing1,ZHAO Chen-Chen1,HUANG Fu-Deng2,PAN Gang1,*,CHENG Fang-Min1,*
摘要:
突变体osles (Oryza sativa leaf early-senescence and salt-sensitive)是利用60Co辐射诱变籼稻品种自选1号后筛选获得的,该突变体从分蘖期开始叶片就出现早衰,主要表现为叶尖和叶边缘变黄,伴有红褐色斑点。此外,盐胁迫下,不仅突变体叶片卷曲枯萎,而且植株高度和生物量显著降低。与野生型相比,突变体除倒一叶外,倒二叶和倒三叶在分蘖期的叶绿素含量均显著降低,而POD活性则在倒一叶、倒二叶和倒三叶中依次显著升高;突变体3片叶片的MDA含量均高于野生型15%左右。除倒一叶外,突变体的SOD活性均显著高于野生型。此外,突变体和野生型3片叶中的可溶性蛋白含量依次下降,但突变体的倒一和倒二叶中的可溶性蛋白含量显著高于野生型,而倒三叶则相反;遗传分析表明,osles突变性状受一隐性基因控制,借助图位克隆技术将控制该性状的基因精细定位于第6染色体长臂的IN6-005769-11/12和RM20547两个标记之间,物理距离为210 kb,为进一步克隆该基因并揭示叶片的早衰分子生理机制奠定基础。
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