Details

Autor(en) / Beteiligte

• Kushnir, U
• Halloran, G.M

Titel

Evidence on the saltatory origin of the G genome in wheat: the description of a Triticum timopheevi-like mutant

Ist Teil von

• Annals of botany, 1983-01, Vol.51 (5), p.561-569

Ort / Verlag

Oxford University Press

Erscheinungsjahr

1983

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A spontaneously occurring somatic mutant of Triticum turgidum dicoccoides showed close morphological resemblance to T. timopheevi (AAGO). The hybrid between the mutant and the T. turgidum dicoccoides ‘ mother’ plant was completely sterile, with very low pollen fertility (0·33 percent). It exhibited a reasonably high frequency of trivalents and quadrivalents at first 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 per cent) and high pollen fertility (86·6 per cent) and almost regular bivalent formation at first metaphase of meiosis. It is proposed that 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.