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Variation du taux d'acide abscissique chez deux variétés de poiriers, la Passe‐Crassane et la Doyenne du Comice, en fonction de l'induction de la parthénocarpie par l'acide gibbérellique
Author(s) -
LAFFRAY D.,
DUPIN J. F.,
PAULET P.
Publication year - 1976
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1976.tb05028.x
Subject(s) - abscisic acid , abscission , cultivar , gibberellic acid , pyrus communis , horticulture , biology , pear , prunus , botany , fruit tree , chemistry , germination , biochemistry , gene
The content of abscisic acid in the developing fruits of two cultivars of pear ( Pyrus communis L.) was determined by UV spectrophotometry and by a colorimetric method based on the possibility of the lactone corresponding to abscisic acid to give a purple colour when sodium hydroxide is added. The young fruits were harvested either from trees treated with gibberellic acid (GA 3 ), for the purpose of inducing parthenocarpy, or from untreated trees. High levels of abscisic acid were associated with abortion and abscission of young fruits (June drop). There was little difference between fruits of GA 3 ‐treated and untreated trees of the cultivar Passe‐Crassane. In the other cultivar, ‘Doyenne du Comice’, the level of abscisic acid in the fruits of GA 3 ‐treated trees was about twice as high as in control fruits and seemed to be directly related to the number of fruits per tree.