稻米胶稠度、碱消值与籼粳分化度的QTL及其相互关系的研究

用Asominori/IR24重组自交系(RIL)为材料,对控制稻米胶稠度、碱消值和籼粳分化度的QTL进行了分析。检测出4个控制胶稠度的QTL(Ge1～Ge4),分别位于第2、7和9染色体上,贡献率分别为16.9%、13.2%、14.0%和11.3%;2个控制碱消值的QTL(As1和As2),分别位于第5和4染色体上,贡献率分别为17.5%和13.0%;同时检测到了5个控制籼粳分化度的QTL(Ij1～Ij5),分别位于第1、2和11染色体上,贡献率分别为21.9%、21.4%、13.4%、25.0%和14.5%。研究认为,胶稠度是由主效基因和微效基因共同决定的,碱消值是由1～2个主基因和若干微效基因控制的,两个蒸煮品质性状均为数量遗传性状。籼粳分化度与胶稠度、碱消值之间呈密切连锁关系。

Study on QTLs Underlying Gel Consistency, Alkali Spreading Value and Indica-Japonica Differentiation Using Recombinant Inbred Lines in Rice

QTLs (Quantitative trait loci)affecting content of gel consistency,alkali spreading value and indica-japonica differentiation were analyzed using a recombinant inbred(RI )lines de-rived from a cross of Asominori×IR 24 by single marker analysis and interval mapping.Four QTLs (Ge1～Ge4)for gel consistency were detected and mapped on chromosome 2?7?9in this popula-tion.Variances explained by the QTLs were16.9%?13.2%?14.0%?11.3%respectively.Two QTLs (As1～As2)for Alkali spreading value were detected and mapped on chromosome 5?4in this population.Variances explained by the QTLs were17.5%?13.0%respectively. Five QTLs (Ij1～Ij5)for indica-japonica differentiation were detected on chromo-some 1?2?11and variances explained by Ij1～Ij5was21.9%?21.4%?13.4%?25.0%?14.5%re-spectively.It was showed that there was significant correlation between gel consistency,alkali spreading value and indica-japonica differentiation.