Heritability of bulb shape in some north European onion varieties
- 1 May 1974
- journal article
- Published by Wiley in Annals of Applied Biology
- Vol. 77 (1) , 61-65
- https://doi.org/10.1111/j.1744-7348.1974.tb01388.x
Abstract
SUMMARY: Heritabilities for shape index (the ratio of bulb height to diameter), based on parent—offspring regressions, were calculated for north European onion cultivars and inbred lines derived from them. Heritability estimates of 0·46 and 0·47 respectively were obtained for the two groups, S0 parent bulbs giving S1 progenies, and S1 parent bulbs giving S2 progenies.Within each offspring progeny, the regression of bulb shape index on loge bulb weight was significant. The regressions were used to estimate the mean shape indices of the progenies at the same mean bulb weight as their parents, and a series of ‘corrected’ progeny shape means thus obtained. Recalculation of the heritabilities using these ‘corrected’ progeny means gave increased estimates (0·78 and 0·84).By using this regression approach, the breeder can achieve high heritabilities when selecting for a specific mean shape index.Keywords
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