水稻低温萌发活力的遗传与QTL分析

HAN Long-Zhi , ZHANG Yuan-Yuan , QIAO Yong-Li , CAO Gui-Lan , ZHANG San-Yuan , KIM Jong-Hwan , KOH Hee-Jong
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引用次数: 56

摘要

以籼粳杂交“密阳23/吉冷1号”200个个体和系为材料,利用微卫星标记,对14℃下萌发期为7、11、14、17 d的F2:3群体低温萌发活力(LVG)的数量性状位点(qtl)进行了鉴定。分析了LVG与其他耐冷性状的相关系数。萌发期为7 d时LVG和萌发活力冷响应指数(CIVG)呈连续分布,F3系的LVG和CIVG偏低。萌发期11 d、14 d和17 d时LVG和CIVG呈接近正态分布的连续分布,为多基因控制的数量性状。与萌发7 d、11 d、17 d的LVG相比,萌发14 d的LVG与其他耐寒性状的相关性更强,且与发芽期、苗期、孕穗期的耐寒性和低温条件下的生长能力显著相关。2号染色体RM29-RM262上的qLVG2, 7号染色体RM336-RM118上的qLVG7-2和qCIVG7-2在萌发期为11、14和17 d时检测到,2号染色体RM29-RM262上的qCIVG2在萌发期为11和14 d时检测到,这是由于上述qtl所观察到的表型变异,在萌发后表型变异增加。与LVG相关的qLVG2变异由6.9%增加到14.2%。与LVG相关的qLVG7-2变异从9.9%增加到11.2%。qCIVG2与CIVG的相关变异由6.3%增加到9.0%。与CIVG相关的qCIVG7-2变异从8.3%增加到12.9%。这些QTL等位基因均来自耐受性亲本鸡冷1号,且极有可能为部分显性。
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Genetic and QTL Analysis for Low-Temperature Vigor of Germination in Rice

The quantitative trait loci (QTLs) for low-temperature vigor of germination (LVG) with a germination period of 7 d, 11 d, 14 d, and 17 d at 14 °C was identified using F2:3 population, which included 200 individuals and lines derived from a cross of indica and japonica “Milyang 23/Jileng 1” with microsatellite markers. The correlation coefficient between LVG and other cold tolerance traits was analyzed. LVG and the cold response index for vigor of germination (CIVG) detected when the germination period was 7 d showed a continuous distribution, which was partial to lower LVG and lower CIVG in F3 lines. LVG and CIVG detected when the germination periods were 11 d, 14 d, and 17 d showed a continuous distribution near normal, which were quantitative traits controlled by multiple genes. LVG detected when the germination period was 14 d was more correlated with other cold tolerance traits than LVG detected when the germination periods were 7 d, 11 d, and 17 d, which was significantly associated with cold tolerance during the bud bursting period, the seedling stage, the booting stage, and the growing ability under cold conditions. qLVG2 located in RM29-RM262 on chromosome 2, qLVG7-2 and qCIVG7-2 located in RM336-RM118 on chromosome 7 were detected when the germination periods were 11 d, 14 d, and 17 d. qCIVG2 located in RM29-RM262 on chromosome 2 was detected when the germination periods were 11 d and 14 d. The variation is due to the observed phenotypic variation by the above QTLs, which was increased following the germination. The variation of qLVG2 related to LVG was increased from 6.9% to 14.2%. The variation of qLVG7-2 associated with LVG was increased from 9.9% to 11.2%. The variation of qCIVG2 correlated with CIVG was increased from 6.3% to 9.0%. The variation of qCIVG7-2 associated with CIVG was increased from 8.3% to 12.9%. These QTL alleles were obtained from the tolerant parent Jileng 1, and the gene action was most likely to be partially dominant.

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