Resistance Improvement of Rice Variety'Dalixiang'with High Susceptibility to Rice Blast by Introduced Pigm
[Objective]Rice variety Dalixiang was bred by indica-japonica hybridization in 2002.With its strong flavor,high quality(first-level national quality standard),good taste,Dalixiang is still widely used in production.But because of it high susceptibility to rice blast,the targeted improvement test of rice blast resistance is carried,so as to reduce the risk in production and application.[Method]Jinxiangyu 1,which contains the broad-spectrum resistance gene Pigm,was used as the male parent,and then Pigm was introduced in Dalixiang through hybridization,backcross and marker-assisted selection(MAS).[Result]There were 78 improved lines with leaf morphology basically consistent with that of Dalixiang in BC4F2,among which the plant height,effective panicle number and panicle length of Dalixiang(Pigm)-17,Dalixiang(Pigm)-26 and Dalixiang(Pigm)-41 were not significantly different from those of Dalixiang,but the 1000-grain weight and panicle number significantly increased.The rice quality reached the second-level national quality standard.The resistance of rice blast of 14 improved lines was significantly improved,the comprehensive resistance index ranged from 5.67 to 7.00,4 lines were moderately susceptible and 10 lines were susceptible,all of which met the resistance standard during production and application.[Conclusion]Through MAS selection and conventional breeding,the broad-spectrum resistance gene Pigm was introduced in Dalixiang,so that three lines[Dalixiang(Pigm)-17,Dalixiang(Pigm)-26 and Dalixiang(Pigm)-41]with high quality(the second-level national quality standard),flavor and moderate resistance to rice blast were obtained from the improved lines,which realized the targeted improvement of rice blast resistance while ensuring the high quality and aroma of Dalixiang.
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