Fruit Set in Orange with Phytohormones and Its Relation to Endogenous Levels of GA3

Abstract

This research work aims to contribute in increasing the fruit set in citrus, given its importance in determining fruit yield. The authors evaluated the effects of phytohormones (auxins, gibberellins and cytokinins) in the mooring and features of orange fruit in cultivars Washington navel and Thomson (Citrus sinensis (L.) Osb.). The experiment was established in a split plot randomized complete block design with five treatments and four replications. Flower tissue samples were stored in liquid N until the extraction of gibberellins and the identification and quantification of GA 3 . The results showed statistically significant difference (P ≤ 0.05) between treatments in the number of fruits retained 129 d after flowering and the percentage of final tie. GA 3 content ranged, on a dry weight basis, from 1.