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油菜每角果粒数差异的细胞学基础和分子机理

DOI: 10.1360/052014-87, PP. 822-831

Keywords: 油菜,每角果粒数,DH系,胚珠发育,油菜素内酯

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Abstract:

每角果粒数在油菜不同品种、品系或其他种质资源之间存在着较大的变异.该性状的研究对于利用优良变异提高油菜产量具有重要意义.对多个DH系和常规栽培种进行分析,研究了油菜每角果粒数差异形成的细胞学基础和分子机理.结果表明,部分胚珠原基在发育过程中败育而不能最终形成成熟的种子,正常发育胚珠百分比是每角果粒数差异的重要决定因素.细胞学分析确定了胚珠败育发生的时期是在大孢子退化之后,单核期配子体形成之前.研究结果还显示,油菜胚珠败育率的差异可能是由BRs-BRI1信号途径调控水平的差异所致.

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