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Evidence on the saltatory origin of the g genome in wheat the description of a triticum timopheevi like mutant


, : Evidence on the saltatory origin of the g genome in wheat the description of a triticum timopheevi like mutant. Annals of Botany (London) 51(5): 561-570

A spontaneously occurring somatic mutant of T. turgidum dicoccoides showed close morphological resemblance to T. timopheevi (AAGG). The hybrid between the mutant and the T. turgidum dicoccoides mother plant was completely sterile, with very low pollen fertility (0.33%). It exhibited a reasonably high frequency of trivalents and quadrivalents at 1st metaphase of meiosis, indicating that the mutation involved substantial levels of chromosome rearrangement. The hybrid between the mutant and T. timopheevi had reasonably high fertility (53.5%) and high pollen fertility (86.6%) and almost regular bivalent formation at first metaphase of meiosis. T. timopheevi could have arisen in consequence of somatic macromutation from T. turgidum dicoccoides giving rise to spontaneous speciation. The G genome of T. timopheevi is possibly monophyletic in origin, arising from rearrangement of chromosomes of the B genome of tetraploid wheat.

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