GENETIC-CONTROL OF ORGANOGENESIS IN COTYLEDONS OF SUNFLOWER (HELIANTHUS-ANNUUS)

Genetic variability for regeneration ability was evaluated by studying direct organogenesis from cotyledons of thirteen genotypes including three cytoplasmic male sterile, three maintenor, three restorer inbred lines, and four F1 hybrids obtained by crosses between some of these inbred lines. The experimental design was a complete randomized block with three replications. A high genetic variability for organogenesis parameters between genotypes was observed in this study. Evidence of c ytoplasmic effect and nucleo-cytoplasmic interaction for some of regen eration parameters was observed. The data also showed the importance o f additive genetic control for organogenesis parameters in most genoty pes.