Analysis on combining ability and genetics of resistance to Fusarium wilt of rooted bottle gourd
The genetic pattern of resistance to calabash Fusarium wilt of rooted bottle gourd was explored,to provide ref-erence for parental selection of calabash Fusarium wilt resistance and phenotypes prediction in hybrid progeny.Four mate-rials with different resistance to calabash Fusarium wilt were used as parents to formulate hybrid combinations by Griff-ing complete diallel hybridization method.The pathogens of Fusarium wilt was inoculated the using root perfusion at seedling stage,and the disease index was calculated to analyze the resistance and combining ability.Hayman genetic anal-ysis method was employed to explore the inheritance of resistance.The result showed that the inheritance of resistance to calabash Fusarium wilt was consistent with the additive-dominance-epistasis model,with additive effects as the main ef-fect,partial dominance as the degree of dominance,and reduced dominance as the direction of dominance.The resistant parents contain more dominant genes than recessive genes,and the narrow heritability of resistance was 77.68％.The gen-eral combining ability(GCA)of H041 was negative,and the negative effect was the largest among the four materials,which could significantly improve the disease resistance of the hybrid offspring.Formulating hybrid combinations with H041 as the parent have a high specific coordination ability(SCA).In summary,in the process of breeding for wilt resis-tance,the parents with strong disease resistance should be selected for hybrid breeding.H041 can be used as the backbone parent for the breeding for wilt resistance in bottle gourd,and selection in earlier generations is more conducive to formu-lating hybrids with strong heterosis.
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