砂梨种质资源果实发育期遗传多样性分析及分级探讨

摘要

2014-2016年记录589份砂梨(Pyrus Pyrifolia Nakai)种质资源的物候期,计算果实发育期并分析其遗传多样性,由此提出果实发育期5个级别的分级标准.结果表明,果实发育期范围是108～202 d,平均果实发育期为160 d,变异系数为13.03％,遗传多样性指数为2.08.不同种质类型种质资源的平均变异系数为国外引进品种(11.67％)>国内选育品种(10.23％)>地方品种(10.03％),平均遗传多样性指数为国内选育品种(2.08)>地方品种(2.06)>国外引进品种(1.96).%589 sand pear(Pyrus Pyrifolia Nakai) germplasm resources phenophase data were collected from 2014 to 2016,ge-netic diversity of fruit development period was analyzed,five levels grading standards of fruit development period were put for-ward. The fruit development period was 108 to 202 days,the average fruit development period was 160 days,the coefficient of variation was 13.03％,and the genetic diversity index was 2.08. The average variation coefficient of different pear germplasm resources types was foreign breeding cultivars (11.67％)>China improved lines (10.23％)>landrace(10.03％),the average ge-netic diversity index was China improved lines (2.08)>landrace (2.06)>foreign breeding cultivars(1.96).