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Two population improvement methods, mass selection (two cycles) and S I  selection (one cycle) were imposed on a base population to study the response to selection by comparing their efficiency in improving autogamy, seed yield and oil content in sunflower. Mass selection was adopted for developing two distinct populations regarding maturity, one early (80-85 days) and one medium (95-100 days). The derived populations MSE -2 (early) and MSM - 2 (medium) retained substantial variability for most of the characters even after two cycles of mass selection. As compared with the base population, these derived populations showed substantial improvements in seed yield, to an extent of 40 to 65%, oil content (38%) and oil yield (83 to 97%). However, the response to S I  selection was effective only in improving oil content. For other characters including seed yield, the derived populations were inferior compared with the base population.

helia

RESPONSE TO MASS AND SI SELECTION FOR AUTOGAMY, SEED YIELD AND OIL CONTENT IN SUNFLOWER POPULATIONS (Helianthus annuus L.) / RESPUESTA A LA SELECCIÓN MASAL Y S1 POR AUTOGAMIA, RENDIMIENTO DE SEMILLA Y CONTENIDO DE ACEITE EN UNA POBLACIÓN DE GIRASOL (Helianthus annuus L.) / RÉPONSES ENTRE LA SÉLECTION MASSALE ET LA SÉLECTION S1 POUR L’AUTOGAMIE, LE RENDEMENT GRAINIER ET LA TENEUR EN HUILE DANS UN POPULATION DE TOURNESOL (Helianthus annuus L.)