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Annals of Botany 74: 465-470, 1994
© 1994 Annals of Botany Company

Relationship between Sylleptic Branching and Components of Parent Shoot Development in the Peach Tree

Michel Génard, Loïc Pagès and Jocelyne Kervella

Unité de Recherches en Ecophysiologie et Horticulture, and Station de Recherches Fruitières Méditerranéennes, INRA Domaine St Paul, 84143 Montfavet Cedex, France

Sylleptic branching of main axes was investigated in three peach tree cultivars ('Armking', 'Flavorcrest' and 'Silvergem') during the first year of growth. An axis was considered as made up of a series of metamers (internode, node, leaf and associated bud) and its growth was divided into two components: the increase of the number of metamers and the lengthening of the metamers themselves (elongation). The relationship between branching probability, type of cultivar, growth components and date of metamer production was studied by logistic regression. Branching probability varied according to the cultivar, increased when the growth components did, and decreased if metamers appeared late in the season. The logistic model fitted the data closely and was validated on a data set that had not been used for estimating the parameters. Ninety-four percent of branched and 70% of unbranched metamers were correctly predicted by the logistic model. For any given growth rate and date of metamer production, the main axes branched most and least often in the 'Flavorcrest' and 'Silvergem' cultivars, respectively.Copyright 1994, 1999 Academic Press

Peach tree, Prunus persica (L.) Batsch, branching, syllepsis, shoot growth, quantitative analysis, logistic regression


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