Amounts of indole-3-acetic acid (IAA) and gibberellic acid (GA3) in vegeta tive and reproductive tissues of diverse sunflower genotypes have been investi gated using gas-liquid chromatography. Quantification of endogenous GA3 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 Rf. The highest amount of IAA was found in the hetero zygous F1 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.