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植物学报  2015 

水稻散状穗突变体sp的遗传分析及基因初定位

DOI: 10.3724/SP.J.1259.2015.00198, PP. 198-205

Keywords: 水稻,散穗突变体,遗传分析,基因定位

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Abstract:

?水稻(Oryzasativa)是我国最主要的粮食作物之一,其穗部形态直接影响着水稻产量和稻米品质。在秋光和七山占构建的重组自交系群体中发现了1个散穗突变体材料sp(spreadingpanicle),田间表现为穗部一次枝梗向外延伸,与穗轴夹角增大,且向四周散开,故暂命名为散穗突变体sp。与野生型相比,突变体sp穗重、每穗粒重、千粒重、粒宽以及粒厚均极显著减少,推测SP可能是1个参与调控穗部形态建成和颖花发育的基因。遗传分析表明,该性状受1个显性核基因控制。利用sp与02428构建的F2群体进行基因定位,将该基因定位在4号染色体长臂端,位于E3和RM17578之间的62.9kb区域内。该结果将为SP基因的图位克隆和揭示其作用机理奠定基础。

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