ISHS Acta Horticulturae 293: IX International Symposium on Apricot Culture
MAIN GENETIC RESULTS FROM A STUDY OF AN APRICOT SEMI-DIALLEL |
| Author: | J. COURANJOU |
| Abstract:
A large apricot breeding programme in France was designed in order to study simultaneously the quantitative genetics of the first generation obtained from three semi-diallels. The results of quantitative genetics presented here concern several traits of aspect and physiology studied in one of the three semi-diallels which was done using seven distantly related parents and which comprised 29 controlled pollinations producing more than 2,600 offsprings. The general combining ability of the parents was found to be closely correlated with their phenotypical level, r ranging from 0.737 to 0.968 according to trait. The means of progenies were more or less closely correlated with the means of mid-parents, r ranging from 0.536 to 0.828 according to trait. The heritability was rather high, h2 ranging from 0.314 to 0.924. The regression of progeny means on mid-parent means cut the bissector y = x except for 3 traits. For those, the regression line was below the bissector. But even in these cases of mean value decrease, some progeny means were above their mid-parent because of a good specific combining ability. Strong maternal effects were observed for 5 traits in only one of the two reciprocal crosses. The particularities of self-progenies are given : inbreeding effects more or less marked, and conversely one with many transgressions. Other studies completed or in progress on this material are indicated : zygosity level of parents, inheritance of Plum pox virus tolerance and finally the general value of progenies and parents is summarized. | |
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