Archesporogenesis, megasporogenesis and female gametophyte development of seedless grapevine cultivars Nedelchev VI-4 and Russalka1
2000
Rojchev, V. (Agricultural University | Viticulture Depatment, BG-4000 Plovdiv (Bulgaria))
Cytoembriological studies of the femalesphere of the flowers of two seedless hybrid cultivars have been performed. It has been established that their ovule are bitegmic, crassinucelate and anatropous.Nucellus is formed normally but degenerates after the formation of the embryo sac. The primary archesporeis of the unicellar type and does not transform directly into a megasporosyte. Megasporogenesis is normal and successive and linear megaspore tetrads are formed. Female gametophyte develops by the polygonum type. Degeneration processes in the embryo sac start after the end of megasporogenesis and are non-synchronized. Double fertilization takes place in some of the ovules. Embryogenesis does not reach its final stage, therefore, no viable seeds are formed.
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Este registro bibliográfico ha sido proporcionado por Institute of Agricultural Economics