Articles
SURVEY OF MAIN RESULTS OBTAINED FROM ONE OF THE SEMI-DIALLELS REALIZED IN APRICOT
Article number
224_32
Pages
263 – 274
Language
Abstract
The semi-diallel presented here was targeted to obtain early ripening varieties; 7 geographycally and genetically more or less distant varieties were used as parents.
In two cases the reciprocal cross was made.
From data collected over 3 years on 15 traits from 29 complete progenies /more than 2 600 individuals/ a genetical study is now in progress.
For every trait the general combining ability of the parents is well related to their phenotypical level.
Correlation coefficients between progeny and mid-parent means are generally high, about 0.7. Heritabilities are different according to the trait considered: from above 0.3 to above 0.9. More or less marked favourable transgressions appear in many traits.
One of the reciprocal crosses in particular indicates the existence of maternal effects for several traits.
The level of traits is affected by self-pollination, usually in the same way for all the parents, except for ‘Earli Orange’ and in the particular case of ‘Screara’, where the self-progeny is strongly affected by an inbreeding effect.
As regards the traits studied, as a whole, the best and the worst progenies are pointed out, thus showing the best /’Earli Orange’, ‘Rouget de Sernhac’/ and the worst parents.
Among the 469 offspring preselected from this semi-diallel, 131 corresponding to 6 progenies come from the parent ‘Early Orange’ tolerant of the sharka virus.
The studies in progress show that a number of them have inherited this tolerance.
Among more than 2 600 offspring studied in this semi-diallel, 469 i.e. 17 % were preselected.
A second generation programme conducted in four directions was partially realized between 1978 and 1981.
In two cases the reciprocal cross was made.
From data collected over 3 years on 15 traits from 29 complete progenies /more than 2 600 individuals/ a genetical study is now in progress.
For every trait the general combining ability of the parents is well related to their phenotypical level.
Correlation coefficients between progeny and mid-parent means are generally high, about 0.7. Heritabilities are different according to the trait considered: from above 0.3 to above 0.9. More or less marked favourable transgressions appear in many traits.
One of the reciprocal crosses in particular indicates the existence of maternal effects for several traits.
The level of traits is affected by self-pollination, usually in the same way for all the parents, except for ‘Earli Orange’ and in the particular case of ‘Screara’, where the self-progeny is strongly affected by an inbreeding effect.
As regards the traits studied, as a whole, the best and the worst progenies are pointed out, thus showing the best /’Earli Orange’, ‘Rouget de Sernhac’/ and the worst parents.
Among the 469 offspring preselected from this semi-diallel, 131 corresponding to 6 progenies come from the parent ‘Early Orange’ tolerant of the sharka virus.
The studies in progress show that a number of them have inherited this tolerance.
Among more than 2 600 offspring studied in this semi-diallel, 469 i.e. 17 % were preselected.
A second generation programme conducted in four directions was partially realized between 1978 and 1981.
Publication
Authors
J. Couranjou, J.M. Duffillol, A. Pomar
Keywords
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