砧用南瓜商业品种的耐盐性评价及农艺性状遗传多样性分析OA

To investigate the salt tolerance and genetic diversity of agronomic traits in the commercial varieties of root-stock-used pumpkin,20 commercial varieties of rootstock-used pumpkin were used as experimental materials.The salt damage index was evaluated under 120 mmol·L-1 NaCl treatment,and the genetic diversity of nine quantitative traits was analyzed,including seed length,seed width,seed thickness,100-seeds mass,shoot fresh mass,root fresh mass,total root length,number of root tips,and salt tolerance.The results showed that Z1(Jinjiazhen)exhibited the strongest salt toler-ance,with a salt damage index of 28.33%.The coefficients of variation of the nine quantitative traits ranged from 11.76%to 63.47%,among which 100-seeds mass had the largest coefficient of variation.Correlation analysis revealed that salt tol-erance was significantly positively correlated with seed thickness,100-seeds mass,shoot fresh mass,and total root length.Based on cluster analysis,the 20 commercial varieties of rootstock-used pumpkin were classified into four groups.GroupⅠ consisted of varieties with higher salt tolerance and 100-seeds mass;Group Ⅱ included varieties with the highest salt in-jury index;Group Ⅲ comprised varieties with the maximum total root length;and Group Ⅳ contained only one cultivar,Cucurbita ficifolia.The findings of this study provide a reference for understanding the genetic diversity of phenotypic traits in commercial varieties of rootstock-used pumpkin and breeding new salt-tolerant varieties of rootstock-used pump-kin.