WHEAT X PEARL-MILLET HYBRIDIZATION - CONSEQUENCE AND POTENTIAL

Eight grain pearl millet (2n=14) accessions were crossed as male to hexaploid spring wheat cv. 'Fukuho' (2n=6x=42). An average of 80% wheat pistils showed pearl millet pollen tube entry in the ovules, compared to 56% in wheat x maize cv. 'Seneca 60' cross. Of the 15 embryos, obtained through in vitro immature seed culture from wheat x pearl millet crosses, 3 plantlets were produced and grown to maturity. These three were of the somatic chromosome constitution 2n=42, 21 and 22, respectively. Haploid wheat plant (2n=21) apparently originated from pearl millet chromosome elimination during embryogenesis. The 22 chromosome plant had retained a single pearl millet chromosome at tillering stage, but this chromosome was eliminated from pollen mother cells prior to and also during gamete formation. The significance and potential uses of this wide cross is discussed. © 1990 Kluwer Academic Publishers.