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GrainGenes Reference Report: TAG-103-1123

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Reference	TAG-103-1123
Title	Early evolution of the chromosomal structure of Triticum turgidum-Aegilops ovata amphiploids carrying and lacking the Ph1 gene
Journal	Theoretical and Applied Genetics
Year	2001
Volume	103
Pages	1123-1128
Author	Benavente E Alix K Dusautoir JC Orellana J David JL
Abstract	Summary: After two selfing generations of two different Triticum turgidum - Aegilops ovata amphiploids carrying the Ph1 gene, or lacking it (ph1c mutant), karyotypes of their offspring were scored by GISH (genomic in situ hybridization). On average, the chromosome number was lower than expected (56 chromosomes) on the basis of the parental constitutions (T. turgidum, AABB, 2n=4x=28; Ae. ovata, M(o)M(o)U(o)U(o), 2n=4x=28). The lost chromosomes belonged to the wild Aegilops species. The two families differed greatly by their number of intergenomic translocations, also detected by GISH. The ph1c family showed nine translocations over 12 plants while only one translocation was observed in the Ph1 family. All exchanges involved either the M(o) and U(o) chromosomes or the M(o) and wheat chromosomes, the size of the exchanged segment ranging from 3% to 36% of the total chromosome length. The results suggest an epistatic effect of the ph1c deletion over the genetic diploidizing system that operates in Ae. ovata since translocated chromosomes are most-likely derived from homoeologous recombination. The potential of these results for wheat breeding programmes is also considered
Keyword	[ Hide all but 1 of 42 ] aegilops aegilops ovata amphiploid breeding breeding programme chromosome chromosome number chromosome translocation constitutions dna hybridization epistasis evolution exchange family gene genome genome analysis genomic in situ hybridization gish homoeologous recombination hybridization in situ in situ hybridization intergeneric hybridization intergenomic translocation lacking mutant ph1 ph1 gene recombination segment selfing situ hybridization structure system triticum triticum durum triticum turgidum turgidum wheat breeding wheat chromosomes wild

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