美洲南瓜种质资源初步评价及白粉病抗性鉴定

Preliminary Evaluation of Cucurbita pepo Germplasm Resources and Identification of Powdery Mildew Resistance

以47份美洲南瓜种质为试材,采用形态学调查和苗期鉴定的方法,研究了白粉病对美洲南瓜种质的影响,并初步评价种质的遗传多样性,以期为美洲南瓜抗病新品种选育提供参考依据。结果表明:27个质量的多样性指数变幅为0.18~1.82,平均值为0.80,具有丰富的遗传多样性;15个数量性状的多样性指数变幅为1.04~1.32,平均值为1.20,数量性状的多样性指数高于质量性状的多样性指数;基于病害指数和隶属函数值进行评价,筛选出高抗种质34份,中抗种质12份,感病种质1份。

Forty-seven Cucurbita pepo germplasms were used as experimental materials,and the effects of powdery mildew on Cucurbita pepo germplasms were studied by using morphological investigation and seedling identification methods.The genetic diversity of the germplasms was preliminarily evaluated,in order to provide reference for the breeding of new resistant Cucurbita pepo varieties.The results showed that the diversity index of 27 qualities varied from 0.18 to 1.82,with an average value of 0.80,indicating rich genetic diversity.The diversity index of 15 quantitative traits varied from 1.04 to 1.32,with an average of 1.20.The diversity index of quantitative traits was higher than that of quality traits.Based on the disease index and membership function values,34 highly resistant germplasm,12 moderately resistant germplasm,and 1 susceptible germplasm were selected for evaluation.