Journal of Experimental Botany, Vol. 53, No. 374, pp. 1613-1625,
July 1, 2002
© 2002 Oxford University Press
Ecophysiological analysis of genotypic variation in peach fruit growth
Received 29 September 2002; Accepted 8 March 2003
1 Unité de Recherche Plantes et Systèmes de culture Horticoles, INRA, Domaine St Paul, Site Agroparc, 84914 Avignon Cedex 9, France
2 Unité de Génétique et Amélioration des Fruits et Légumes, INRA, Domaine St Paul, Site Agroparc, 84914 Avignon Cedex 9, France
3 To whom correspondence should be addressed. Fax: +33 432 72 24 32. E-mail: quilot{at}avignon.inra.fr
Cultivated varieties generally differ greatly from wild genotypes of the same closely related species. However, the processes responsible for these differences have not been elucidated. To analyse variations in fruit mass, fruit growth was characterized in a peach cultivar, a wild related species non-cultivated, and four hybrids derived by crossing them. These genotypes offer a wide range of agronomic values. An ecophysiological model of peach fruit growth in dry mass was used. This model simulates carbon partitioning at the shoot-bearing fruit level by considering three compartments: fruits, 1-year-old stems and leafy shoots. The experimental measurements showed considerable variation between genotypes for fruit mass at maturity, fruit growth and source activity. The parameters of the ecophysiological model for each genotype were estimated from experimental data,. The model made it possible to account for genotypic variations in fruit growth and for genotypexfruit load interactions. Using the model, it was shown that the main processes explaining fruit growth variations among the genotypes studied were differences in potential fruit growth.
Key words: Key words: ecophysiology, fruit growth, genotypes, model, peach.
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