Articles
RIPENING TIME WITHIN A CROSS-DERIVED POPULATION OF JAPANESE PLUM
Article number
478_7
Pages
61 – 66
Language
Abstract
Ripening time was evaluated in a seedling population of Japanese plum planted in 1990, which comprised 377 seedlings derived from 12 controlled crosses.
Heritability, estimated by regressing the 12 F1 progenies on their mid-parents, was very low (0.44), suggesting a great non-additive genetic component of variance.
A high variability was observed in the distribution of offsprings compared to their respective parents, either for range of ripening time, or frequency and mode.
The distribution of frequencies showed 3 different patterns: uni-, bi and tri-modal.
In some cases the offspring mean and mode were almost equal to the parent mean; otherwise mode and/or mean were anticipated or postponed with respect to both parents.
These results indicated that in a Japanese plum breeding programme parents should be evaluated and chosen on the base of cross performance and combining ability.
Heritability, estimated by regressing the 12 F1 progenies on their mid-parents, was very low (0.44), suggesting a great non-additive genetic component of variance.
A high variability was observed in the distribution of offsprings compared to their respective parents, either for range of ripening time, or frequency and mode.
The distribution of frequencies showed 3 different patterns: uni-, bi and tri-modal.
In some cases the offspring mean and mode were almost equal to the parent mean; otherwise mode and/or mean were anticipated or postponed with respect to both parents.
These results indicated that in a Japanese plum breeding programme parents should be evaluated and chosen on the base of cross performance and combining ability.
Authors
E. Bellini, V. Nencetti, S. Nin, S. Paraluppi
Keywords
Prunus salicina, controlled crosses, offspring-parent regression, heritability
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