Preliminary Study of Asymmetric Protoplast Fusion Between Celery (Apiumgraveolens L. ) and CMS Carrot (Daucus ca rota L. ) PRELIMINARY STUDY ON HYBRID CHROMOSOME COMPOSITION AND RELATIONSHIP IN SYMMETRIC HYBRIDIZATION BETWEEN TRITICUM AESTIVUM AND INTERGENERIC GRASSES Preliminary Study of Asymmetric Protoplast Fusion Between Celery (Apiumgraveolens L. ) and CMS Carrot (Daucus ca rota L. ) Plant Regeneration from Asymmetric Somatic Hybrids of Oryza sativa and Panicum maximum Fertile Hybrid Plant Regeneration from Somatic Hybridization Between Triticum aestivum and Agropyron elongatum Protoplasts Culture and Asymmetric Somatic Hybridization Between Medicago sativa and Lotus corniculatus