杉木种子园种子品质性状变异及遗传参数

为进一步了解杉木Cunninghamia lanceolata种子品质遗传变异规律,对浙江省22个不同世代不同类型种子园,连续4 a采种、取样和测定,系统地分析了种子千粒质量、涩籽率、发芽率、发芽指数、芽苗长度和活力指数等6项品质性状的变异、遗传力和遗传相关.结果表明,种子活力指数表型变异与遗传变异均最大,涩籽率变异次之,芽苗长度变异最小.种子千粒质量遗传力最大,涩籽率次之,其后依次为芽苗长度、发芽率、活力指数和发芽指数.千粒质量与各性状具有轻度和中度的遗传相关关系,涩籽率在遗传上除与千粒质量呈轻度负相关外,与其他性状没有相关关系,发芽率与发芽指数以及发芽指数、芽苗长度与活力指数遗传相关紧密.表4参12

Seed quality character variation and seed genetic parameters of Cunninghamia lanceolata in seed orchard

For knowing further about the genetic variation regularity of seed quality of Cunninghamia lanceolata,22 seed orchards in different generations and different types were studied.After seed collecting,sampling,measuring for successive 4 years,the variation,heritability and genetic correlation of 6 quality characters,including thousand-grain weight,precentage of woody,germination percentage,germination index,seedling length,and vigor index were systemically analyzed.The results revealed that the level of phenetic and genetic variation of vigor index was the highest,that of sterile seed rate was the second ,and that of seedling length was the lowest.Those seed quality characters from high to low in heritability order were as follows:thousand-grain weight,percentage of woody seed,seedling length,germination percentage,vigor index and germination index.There were light correlations between thousand-grain weight and other quality characters.There were light correlations between thousand-grain weight and other quality characters.There were no correlations between percentage of woody seed in heredity and others,except thousand-grain weight which relationship is lightly negatively correlated.But there were close correlations between germination percentoge and germination index,also between vigor index and germination index,seedling length.