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Amounts of indole-3-acetic acid (IAA) and gibberellic acid (GA 3 ) in vegetative and reproductive tissues of diverse sunflower genotypes have been investigated using gas-liquid chromatography. Quantification of endogenous GA 3  content in the homozygous line MB 514, characterized by cytoplasmic male sterility ( cms ), revealed a lower level of the hormone in contrast to the fertility restorer line RW 637 R f . The highest amount of IAA was found in the heterozygous F 1  hybrid obtained by crossing these lines, regardless of tissues and ontogenetic phases analyzed. Similar features were found in leaves, apices, inflorescences and disk flowers in most of the investigated variants.

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GENETIC-PHYTOHORMONAL INTERACTIONS IN MALE FERTILITY AND MALE STERILITY PHENOTYPE EXPRESSION IN SUNFLOWER (Helianthus annuus L.) / INTERACCIONES GENÉTICO-FITOHORMONALES EN LA EXPRESIÓN FENOTÍPICA DE LA ANDROFERTILIDAD Y ANDROESTERILIDAD EN GIRASOL (Helianthus annuus L.) / INTERACTIONS GÉNÉTIQUES PHYTOHORMONALES DANS L’EXPRESSION PHÉNOTYPIQUE D’UN MALE FERTILE ET MALE STERILE DU TOURNESOL (Helianthus annuus L.): Communication 1. COMPARATIVE INVESTIGATION OF AUXIN AND GIBBERELLIN QUANTITIES IN DIVERSE SUNFLOWER GENOTYPES / Parte I: Investigación comparativa de la cantidad de auxinas y giberelinas en diversos genotipos de girasol / Partie I: Recherche comparative de la quantité d’auxines et de gibberellins dans divers genotypes de tournesol