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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.

Accession: 005411870

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Related references

Kushnir U.; Halloran G.M., 1983: Evidence on the origin of the g genome in wheat cytology and fertility of a triticum timopheevi like mutant. A spontaneous somatic mutant with T. timopheevi Zhuk. plant morphology was found in late tillers of a T. turgidum L. var. dicoccoides (Bowden) plant. Hybrids of the timopheevi-like mutant with T. turgidum L. var. dicocooides (Bowden), T. timopheev...

Kushnir, U.; Halloran, G.M., 1983: Evidence on the origin of the G genome in wheat: physiological and quantitative character variation in a Triticum timopheevi-like mutant. Among 350 lines of T. turgidum var. dicoccoides [T. dicoccoides] from Israel, a plant of the variety spontaneum nigrum was noticed which developed four late tillers with T. timopheevii-like morphology; this mutation was shown to be heritable. Stud...

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Wagenar Wagenaar, E.B., 1966: Studies on the genome constitution of Triticum timopheevi Zhuk. II. The T. timopheevi complex and its origin. Introductions belonging to the wild-growing tetraploid timopheevi group of wheats and collected in the Transcaucasian states of the USSR, northern Iraq and eastern Turkey were intercrossed and the subsequent F1 hybrids studied cytologically. Chrom...

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Jouve, N.M.nzanares, C., 1976: Cytogenetic relationships between the B genome of Triticum timopheevi Zhuk. and the B genome of Spanish tetraploid wheat cultivars. Genetica Iberica: 8 (1 2) 143-155

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