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GrainGenes Reference Report: GNM-45-391

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Reference	GNM-45-391
Title	Repetitive DNAs of wild emmer wheat (Triticum dicoccoides) and their relation to S-genome species: molecular cytogenetic analysis
Journal	Genome
Year	2002
Volume	45
Pages	391-401
Author	Raskina O Belyayev A Nevo E
Abstract	Summary: We have analyzed the chromosomal GISH molecular banding patterns of three populations of the wild allopolyploid wheat Triticum dicoccoides in an attempt to unravel the evolutionary relationships between highly repetitive DNA fractions of T. dicoccoides and proposed diploid progenitors of the B genome. Aegilops speltoides showed almost complete affinity of its repetitive DNA to C-heterochromatin of T. dicoccoides, whereas other S-genome species demonstrated relatedness only to distal heterochromatin. This substantiates the priority of Ae. speltoides as the most similar to the wheat B-genome donor in comparison with other Sitopsis species. Using molecular banding technique with DNA of different Aegilops species as a probe permits tracing of the origin of each heterochromatin cluster. Molecular banding analysis reveals polymorphism between three wild emmer wheat populations. Comparison of molecular banding patterns with chromosomal distribution of the Ty1-copia retrotransposons, which constitute a large share of T. dicoccoides genome, makes it possible to propose that the activity of transposable elements may lie in the background of observed intraspecific polymorphism
Keyword	[ Hide all but 1 of 54 ] a-genome aegilops aegilops speltoides affinity allopolyploid analysis b genome banding banding technique bread wheat canada chloroplast dna chromosome structure cluster cytogenetic analysis dicoccoides diploid distribution dna element emmer emmer wheat evolution evolutionary evolutionary relationships fraction genetic genome gish heterochromatin molecular cytogenetic analysis origin pattern phylogeny polymorphism polyploid wheats population progenitor relationships repeated nucleotide-sequences repetitive dna retrotransposon reveals species speltoides transposable element triticum triticum dicoccoides ty1-copia retrotransposons wheat wheat populations wild wild emmer wild emmer wheat

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