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A novel variant devoid of rayflorets was identified in the interspecific derivatives of the cross between cultivated sunflower and  H. divaricatus . The outermost whorl of the capitulum was comprised of modified disc florets which had longer petals than the regular disc florets and were hermaphrodite unlike the ray florets which are unisexual with non-functional stigmas. Inheritance studies indicated that the apetalous trait is under monogenic recessive gene control. Utility of the trait in physiological and breeding studies is under investigation.

helia

RAY-FLORETLESS SUNFLOWER IN THE INTERSPECIFIC DERIVATIVES OF THE CROSS Helianthus annuus L. × H. divaricatus / GIRASOL SIN FLORES LIGULADAS ENTRE LOS DERIVADOS DEL CRUZAMIENTO INTERESPECÍFICO Helianthus annuus L. × H. divaricatus / TOURNESOL SANS FLEURONS LIGULÉS SUR LE CAPITULE CHEZ LES DÉRIVÉS INTERSPÉCIFIQUES DU CROISEMENT Helianthus annuus L.× H. divaricatus