Progress of Haploid Production in Compositae Haploid Plant Induction via in Vitro Gynogenesis and Plant Regeneration in Onion(Allium cepa L.) Studies on Gynogenesis by Means of Culture in Vitro of Unfertilized Ovary of Strawberry Studies on Gynogenesis by Means of Culture in Vitro of Unfertilized Ovary of Strawberry Haploid Plant Induction via in Vitro Gynogenesis and Plant Regeneration in Onion(Allium cepa L.) EXPERIMENTAL STUDIES ON SEVERAL FACTORS AFFECTING UNFERTILIZED OVULE CULTURE IN SUNFLOWER