Relationship between inbreeding coefficients and plant height of 1-year-old seedlings in crosses among Japanese pear (Pyrus pyrifolia Nakai) cultivars/selections
- 作者：Akihiko Sato ; Yutaka Sawamura ; Norio Takada ; Toshio Hirabayashi
- 关键词：Japanese pear ; Pyrus pyrifolia ; Inbreeding depression ; Vigor ; Plant height
- 刊名：Scientia Horticulturae
- 出版年：2008
- 期刊代码：93_03044238
- 类别：abs
- 出版时间：12 June 2008
- 卷：117
- 期：1
- 页码：85-88
- 文件大小：181 K
摘要
Plant height, a vigor trait, in 1-year-old seedlings made from Japanese pear (Pyrus pyrifolia) cultivars/selections was measured using 994 individuals from 29 families. The family mean of plant height was negatively correlated (r = −0.72**) to the inbreeding coefficients (F). The regression of the family mean (Fm) on the F value (Fm = 130 − 104F) showed that inbreeding depressions were 8%, 20%, and 40%for F = 0.1, 0.25, and 0.5, respectively. According to the regression, the family mean at F = 0 was estimated at 130 cm. These results showed that the vigor was greatly influenced by inbreeding in Japanese pear. Within-family variances, the genetic segregation of offspring in a family, differed according to family. The proportions of offspring with plant height above 130 cm (estimated Fm for F = 0) were extremely low, i.e., 0–17%for 0.5 ≤ F < 0.60 and 0–8%for F = 0.75.