ISHS Acta Horticulturae 814: XII EUCARPIA Symposium on Fruit Breeding and Genetics
INFLUENCE OF JUVENILITY AND OTHER FACTORS IN THE EVALUATION OF FLOWERING TIME IN YOUNG APRICOT SEEDLINGS |
| Authors: | J.A. Campoy, D. Ruiz, J. Egea, P. Martínez-Gómez |
| Keywords: | flowering time, chilling and heat requirements, SSR markers, inheritance |
| Abstract:
In this study, different factors affecting the evaluation of flowering time in young apricot seedlings including juvenility, presence of a major gene for late flowering, presence of accidental pollinations, and consanguinity (inbreeding) have been studied. Flowering time was evaluated in two apricot progenies (F1 and BC1) from the cross between the apricot cultivar ‘Orange Red’® (late flowering) and the Spanish cultivar ‘Currot’ (early flowering). In addition, a molecular characterization of the BC1 progeny was performed using nuclear simple sequence repeat markers. Results indicated the great effect of the juvenility (seedlings with vigorous long branches and a later flowering) in the evaluation of flowering time in apricot and the risk of evaluation of flowering time during the juvenility period. The presence of a major dominant gene for late flowering in apricot and the presence of deleterious genes have been discarded. In addition, chilling accumulation of the year greatly affects the variability of the flowering time in the progenies and can also affect the evaluation of the flowering time in the young apricot seedlings assayed. Finally, the effect of accidental pollinations and consanguinity was reduced in the evaluation of young seedlings. In conclusion, results in the first years of evaluation of young apricot seedlings must be confirmed with information in well-developed trees. | |
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