Genotypic Differences in the Leaf Emergence Rate of Young Peach Trees

in Journal of the American Society for Horticultural Science
Authors:
Jocelyne KervellaInstitut National de la Recherche Agronomique, Domaine Saint-Paul, F-84143 Montfavet cedex, France

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Loïc PagèsInstitut National de la Recherche Agronomique, Domaine Saint-Paul, F-84143 Montfavet cedex, France

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Michel GénardInstitut National de la Recherche Agronomique, Domaine Saint-Paul, F-84143 Montfavet cedex, France

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Leaf emergence was studied on main and first-order shoots of peach and nectarine [Prunus persica (L.) Batsch.] trees belonging to nine standard cultivars, during their first growing season. The number of emerged leaves was recorded on main shoots (originating from the grafted buds) and on first-order shoots (inserted directly on main shoots). Similarly shaped leaf emergence curves were observed on main and first-order shoots for all the cultivars. Leaf emergence rate decreased gradually as the number of leaves increased. The number of emerged leaves could be modeled as a monomolecular function of accumulated thermal units. Significant differences were found between cultivars in a multiple analysis of variance of the model parameters, for main and first-order shoots. The ranking of the cultivars was similar for both types of shoots. Leaf emergence rate was lower on first-order shoots than on main shoots. Differentiating between shoot types is necessary for a reliable comparison of genotypes.

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