3B染色体短臂小麦赤霉病抗性主效QTL的分析

Analysis of Major QTL for Fusarium Head Blight Resistance on the Short Arm of Chromosome 3B in Wheat

采用区间作图和复合区间作图方法对重组自交系群体宁 894 0 37 Alondra、望水白 Alondra和苏麦 3号 Alon dra进行了抗赤霉病QTL分析 ,结果表明 ,用在田间和温室的赤霉病抗性鉴定资料 ,在 3个赤霉病抗源宁 894 0 37、望水白和苏麦 3号的 3B染色体短臂上均检测到主效QTL的存在。宁 894 0 37主效QTL位于标记BARC133与Xgwm4 93之间的 5 0cM的区间内 ,最高可解释 4 2 8%的赤霉病抗性 ;望水白的主效QTL位于标记BARC14 7与Xgwm4 93之间11 5cM的区间内 ,最高可解释 15 1%的赤霉病抗性 ;苏麦 3号的主效QTL位于Xgwm5 33a与Xgwm4 93之间 13 0cM的区间内 ,最高可解释 10 6 %的赤霉病抗性。与赤霉病抗性主效QTL紧密连锁的标记均为SSR标记 。

Three recombinant inbred populations,Ning894037/Alondra,Wangshuibai/Alondra and Sumai3/Alondra,were analyzed for QTLs associated with Fusarium head blight resistance by interval mapping and composite interval mapping in this study.The result showed that the major QTLs were detected on the short arm of chromosome 3B of all three resistant parents using the data of FHB resistance evaluated in greenhouse or field.They were located in the interval of 5 0 cM between BARC133 and Xgwm493 in Ning894037,11 5 cM between BARC147 and Xgwm493 in Wangshuibai,and 13 0 cM between Xgwm533a and Xgwm493 in Sumai3,explaining 42 8%,15 1% and 10 6% of the phenotypic variance for TypeⅡ resistance (spread within the spike),respectively.Some of the SSR markers linking to the major QTLs tightly can be used directly in marker assisted breeding to improve FHB resistance in wheat.