NDLI: Tandem repeats on an eco-geographical scale: outcomes from the genome of Aegilops speltoides

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Tandem repeats on an eco-geographical scale: outcomes from the genome of Aegilops speltoides

Content Provider	Springer Nature Link
Author	Raskina, Olga Brodsky, Leonid Belyayev, Alexander
Copyright Year	2011
Abstract	The chromosomal pattern of tandem repeat fractions of repetitive DNA is one of the most important characteristics of a species. In the present research, we aimed to detect and evaluate the level of intraspecific variability in the chromosomal distribution of species-specific Spelt 1 and Aegilops-Triticum-specific Spelt 52 tandem repeats in Aegilops speltoides and in closely related diploid and polyploid species. There is a distinct eco-geographical gradient in Spelt 1 and Spelt 52 blocks abundance in Ae. speltoides. In marginal populations, the number of Spelt 1 chromosomal blocks could be 12–14 times lower than in the center of the species distribution. Also, in related diploid species, the abundance of Spelt 52 correlates with evolutionary proximity to Ae. speltoides. Finally, the B- and G-genomes of allopolyploid wheats have Spelt 1 chromosomal distribution patterns similar to those of the types of Ae. speltoides with poor and rich contents of Spelt 1, respectively. The observed changes in numbers of blocks of Spelt 1 and Spelt 52 tandem repeats along the eco-geographical gradient may due to their depletion in the marginal populations as a result of increased recombination frequency under stressful conditions. Alternatively, it may be accumulation of tandem repeats in conducive climatic/edaphic environments in the center of the species’ geographical distribution. Anyway, we observe a bidirectional shift of repetitive DNA genomic patterns on the population level leading to the formation of population-specific chromosomal patterns of tandem repeats. The appearance of a new chromosomal pattern is considered an important factor in promoting the emergence of interbreeding barriers.
Starting Page	607
Ending Page	623
Page Count	17
File Format	PDF
ISSN	09673849
Journal	Chromosome Research
Volume Number	19
Issue Number	5
e-ISSN	15736849
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-06-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aegilops B-chromosomes Eco-geographical gradient Heterochromatin Tandem repeats Triticum Plant Genetics & Genomics Animal Genetics and Genomics Human Genetics Cell Biology
Content Type	Text
Resource Type	Article
Subject	Genetics

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