Cyto embryological studies on the process of fertilization and the development of ha ploid embryos of triticum aestivum 2n equals 42 after crossing with hordeum bulbosum 2n equals 14

Zenkteller, M.; Straub, J.

Zeitschrift fuer Pflanzenzuechtung 82(1): 36-44


Accession: 005081409

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Fertilization was studied in 'Chinese Spring', 'Bali' and 'Janus' common wheat (T. aestivum L.) after pollination with H. bulbosum (2n = 14). The pollen grains germinated almost immediately after attaching themselves to the stigmas, and in about 30-40 min the pollen tubes reached the embryo sacs. Fertilization occurred in all 3 cultivars, but only in 'Chinese Spring' did the zygote divide further. In this cross embryos developed concomitantly with poor endosperm. In some embryo sacs, the endosperm did not develop and proembryos degenerated early. During embryogenesis chromsome elimination was observed. Usually caryopses started to abort 12 days after pollination. Forty-six embryos at various stages were isolated from which 20 fully developed haploid plants were obtained. When 'Bali' and 'Janus' were pollinated with H. bulbosum the male gametes entered the egg cells and the polar nuclei, but neither the zygotes nor the primary endosperm nuclei developed.