水稻籼粳交DH群体白叶枯病抗性的QTL定位

Mapping QTLs for Bacterial Blight Resistance in a DH Population from japonica/indica Cross of Rice (Oryza sativa)

以中抗白叶枯病的粳稻品种春江06、感病品种TN1及其DH群体为材料,接种白叶枯病菌浙173后,考察了该DH群体的白叶枯病抗性,并进行了数量性状座位(QTL)分析。共检测到控制白叶枯病的3个QTL(qBBR1、qBBR3-1和qBBR7),分别位于第1、3和第7染色体上,其中第3染色体上的qBBR3-1和第7染色体上的qBBR7加性效应为正值;而位于第1染色体上的qBBR1为负值,3个QTL的总效应达54.4%。春江06中不存在白叶枯病抗性主基因,它的抗性由微效多基因控制,其中在第3和第7染色体上分别有1个QTL。

A double haploid （DH） population derived from the cross between a japonica parent Chunjiang 06 and an indica parent TN1 was used to detect QTLs for resistance to rice bacterial blight（BB）. Chunjiang 06 was moderately resistant to the strain of Xanthomonas oryzae pv. oryzae （Xoo）, Zhe 173 and TN1 was susceptible to. Three QTLs （qBBR1 ,qBBR3-1 , qBBRT） were detected for BB resistance on chromosomes 1, 3, 7, respectively, qBBR3-1 and qBBR7 showed additive effect, and qBBR1 negative. The result revealed that Chunjiang 06 did not carry any major resistance gene and two QTLs were detected on chromosomes 3 and 7 conferring the resistance to Xoo strain.