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核农学报  2015 

贵州地方稻种来拢小圆粒半矮秆突变体srd-1筛选及鉴定

DOI: 10.11869/j.issn.100-8551.2015.04.0629, PP. 629-636

Keywords: 来拢,srd-1突变体,筛选与鉴定

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Abstract:

以贵州地方稻种来拢突变体库中能稳定遗传的小圆粒半矮秆突变体srd-1为材料,对其半矮化和小圆粒性状分子机制进行研究.暗形态建成表明srd-1突变体矮化性状与BR无关.srd-1突变体表现对GA敏感,外源GA3对突变体幼苗第2叶鞘有促进生长作用,能诱导α-淀粉酶活性,可以使倾斜方向排列的细胞微管骨架恢复至野生型横向排列方向,表明srd-1突变体矮化性状与GA信号传导途径无关.GA合成途径中关键酶基因OsKS1和OsGA2ox1表达相对于野生型差异不显著,OsCPS、OsKO2、OsKAO、OsGA20ox2和OsGA30ox2基因表达下调,初步说明srd-1突变体的矮化性状可能是由活性GA生物合成降低所致.此外,小圆粒调控基因SRS1、SRS3和SRS5表达下调,表明srd-1突变体突变基因同时参与了籽粒大小和株高的调控,突变基因影响了活性GA的生物合成和小圆粒调控关键酶基因的表达,进而导致了矮化和小圆粒表型的产生.该研究为突变体突变基因的定位及利用研究提供了参考.

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