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http://dx.doi.org/10.7235/hort.2015.14030

Inheritance of Fruit Ripening Time in Oriental Pear (Pyrus pyrifolia var. culta Nakai)  

Hwang, Hae-Sung (Fruit Research Division, National Institute of Horticultural and Herbal Science)
Byeon, Jae-Kyun (Department of Horticultural Science, Yeungnam University)
Kim, Whee-Cheon (Rural Development Administration)
Shin, Il-Sheob (Pear Research Institute, National Institute of Horticultural and Herbal Science)
Publication Information
Horticultural Science & Technology / v.33, no.5, 2015 , pp. 712-721 More about this Journal
Abstract
To improve the breeding efficiency of oriental pear, heritability, correlation and frequency distribution of fruit ripening date were analyzed using 4,035 seedlings obtained from 15 families between 13 parental cultivars. Although variation of fruit ripening time was higher in most early-ripening parental cultivars than in late-ripening parental cultivars, according to analysis of average, standard deviation, and coefficient of ripening variation for ten years, fruit ripening time obtained from all parental cultivars was inherited narrower and more stable variation than others fruit trait, with 0.92-3.41 in coefficient of variation. The heritability of fruit ripening time was calculated to be over 0.8 in almost all crosses and average fruit ripening time of seedlings from cross combinations could be predicted based on that of the parental cultivars due to its superior heritability relative to other fruit traits. The average ripening time was earlier than the mid-parental value in families obtained from cross combinations using at least one late-ripening cultivar as parent, indicating that the early-ripening trait was more likely to be dominant compared to the late-ripening trait. By contrast, average ripening time was clustered in families of crosses not only between mid-season and early-season cultivars, but also between mid-season and mid-season cultivars. There was highly significant relationship (at 0.68) between mid-parental and progeny mean fruit ripening time. The correlation between fruit ripening time and fruit weight was also highly positive and thus, the mid-parental fruit ripening time could be a potent criterion for indirect selection of fruit weight.
Keywords
breeding; correlation; evaluation; heritability; seedling;
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