利用百农AK58/碧蚂4号重组自交系定位小麦品质性状QTL

Mapping of Quantitative Trait Loci for Quality Traits Using Recombinant Inbred Line Population Derived from Bainong AK58/Bima 4 in Wheat

为发掘小麦品质性状相关数量性状位点(QTL),以小麦骨干亲本百农AK58和碧蚂4号衍生的包含248个株系的重组自交系群体为材料,利用4个环境获得的蛋白质含量、湿面筋含量、淀粉含量、沉降值和延伸性等品质参数及已构建的单核苷酸多态性(SNP)高密度遗传连锁图谱进行QTL定位。通过完备区间作图法共检测到60个品质性状相关QTL,分布于除6B以外的20对小麦染色体上。有21个QTL可以在2个或2个以上环境中被检测到,其中15个QTL的增效基因来自百农AK58,6个QTL的增效基因来自碧蚂4号。4A染色体上116.4~139.0 cM(629.36~701.53 Mb)是一个QTL簇,该区段同时定位了与蛋白质含量(QGpc.his-4A-2)、湿面筋含量(QWgc.his-4A-2)、沉降值(QSv.his-4A)和延伸性(QEx.his-4A)相关的QTL。分析重组自交系群体中1BL/1RS易位对品质性状的影响,发现1BL/1RS易位有助于提高籽粒蛋白质含量、湿面筋含量和沉降值,对淀粉含量有一定的负效应,推测1BL/1RS易位系对品质性状的作用可能和其遗传背景相关。

In order to find the loci associated with quality traits in wheat, the mapping of quantitative trait loci(QTL)was conducted using the high-density genetic linkage map based on single nucleotide polymorphism(SNP)and the quality parameters surveyed in four environments including grain protein content, wet gluten content, starch content, sedimentation value and extensibility with the recombinant inbred line population derived from Bainong AK58/Bima 4.A total of 60 QTLs were identified by inclusive composite interval mapping, which were distributed on 20 chromosomes except for 6B.21 QTLs were found in two or more environments, of which the positive alleles of 15 QTLs were derived from Bainong AK58 and the positive genes of the remaining 6 QTLs were derived from Bima 4. A QTL cluster was found on chromosome 4A in the interval of 116.4—139.0 cM(629.36—701.53 Mb),and several QTLs such as QGpc.his-4A-2,QWgc.his-4A-2,QSv.his-4A and QEx.his-4A were identified in this region.Furthermore, 1BL/1RS translocation caused improvement of protein content, wet gluten content and sedimentation value, but showed a negative effect on starch content.It is supposed that the impact of 1BL/1RS translocation lines on quality may be associated with their genetic background.