חיפוש מתקדם
Annals of Botany
Kushnir, U., School of Agriculture and Forestry, University of Melbourne, Parkville, VIC 3052, Australia
Halloran, G.M., School of Agriculture and Forestry, University of Melbourne, Parkville, VIC 3052, Australia
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. © 1983 Annals of Botany Company.
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Evidence on the saltatory origin of the G genome in wheat: The description of a Triticum timopheevi-like mutant
51
Kushnir, U., School of Agriculture and Forestry, University of Melbourne, Parkville, VIC 3052, Australia
Halloran, G.M., School of Agriculture and Forestry, University of Melbourne, Parkville, VIC 3052, Australia
Evidence on the saltatory origin of the G genome in wheat: The description of a Triticum timopheevi-like mutant
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. © 1983 Annals of Botany Company.
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