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Successful interspecific hybridization was carried out between the wild perennial diploid species  Helianthus pumilus  Nutt., accession GT-M-172, and cultivated  H.annuus  L. The cross compatibility between  H.pumilus  and  H.annuus  was much higher when the wild species was used as the male in the crosses. Insemination (seed set) was very low in both directions. In order to prove the presence of considerable variability in the early F 1  generation, some statistical methods were used for evaluation of morphological traits such as plant height, head diameter, number of disk flowers and insemination. Heterosis was detected for plant height. Cases of partial to complete dominance of the cultivated parent prevailed. A high level of segregation was observed in the F 2  generation, therefore, traits depression and transgression were evaluated for plant height, head diameter, number of florets and seed set. A triple phenotypic correlation appeared between three characters in sunflower and one of them was confirmed on genetic level as well. Resistance to  Plasmopara helianthi ,  Orobanche cumana  and  Phomopsis helianthi  was discovered in different progenies of the interspecific hybrids of  H.pumilus .

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INTERSPECIFIC HYBRIDIZATION BETWEEN H. pumilus nutt. AND H. annuus L. AND THEIR POTENTIAL FOR CULTIVATED SUNFLOWER IMPROVEMENT / LA HIBRIDIZACIÓN DE INTERSPECIES ENTRE H. pumilus NUTT. Y H. annuus L. Y SU POTENCIAL PARA EL ADELANTO DE GIRASOL / HYBRIDATION INTERSPÉCIFIQUE ENTRE H. pumilus NUTT. ET H. annuus L. ET LEUR POTENTIEL DANS L’AMÉLIORATION DU TOURNESOL CULTIVÉ