10个水稻种质资源稻瘟病抗性表达与产量性状分析OA

To investigate the genetic relationship between blast resistance and yield traits in medium indica rice combina-tions,ten new medium indica rice combinations and one control were used as materials.The yield components of these ma-terials were systematically measured,and natural induction identification was conducted in disease nurseries in Anhui Provincesand Hubei Province to calculate the mean resistance index(MRI).Furthermore,eight blast resistance genes were detected using molecular marker technology.Comprehensive evaluations of multiple traits were performed using correla-tion analysis,path analysis,and principal component analysis(PCA).The results showed that the number of filled grains per panicle had the largest direct effect on yield(0.65),making it the core determinant of yield formation.Materials with a higher MRI tended to have lower numbers of filled grains per panicle and lower yields.For example,the highly suscep-tible control(ck)exhibited lower yield than several moderately resistant combinations,suggesting a clear'resistance-yield'trade-off within the tested population.Notably,combinations carrying the Pigm gene achieved relatively high yields while maintaining moderate resistance levels,indicating the potential value of this gene in synergistic improvement.A medium-resistance and high-yield breeding strategy was proposed,based on'avoiding high susceptibility'and centered on'enhanc-ing the number of filled grains per panicle and seed setting rate'.This study provides a new theoretical basis and elite pa-rental materials for the synergistic breeding of high-yield and blast-resistant rice.