期刊
CHROMOSOMA
卷 120, 期 2, 页码 199-212出版社
SPRINGER
DOI: 10.1007/s00412-010-0303-8
关键词
-
资金
- Polish Ministry of Science and Higher Education [N N303570738, N N303 569538]
- BBSRC [BBSEW00003130B]
The temperate annual grass Brachypodium distachyon is a diploid species with a chromosome base number of 5. It is strikingly different from other Eurasian species of the genus, which are perennial and often polyploid, with the diploids typically having base numbers of 8 or 9. Previously, phylogenies indicated that B. distachyon split from the other species early in the evolution of the genus, while its genome sequence revealed that extensive synteny on a chromosomal scale had been maintained with rice, a tropical grass with a base number of 12. Here we show evidence that B. distachyon may have a homoploid origin, involving ancestral interspecific hybridisation, although it does not appear to be a component of any of the perennial Eurasian allopolyploids. Using a cytogenetic approach, we show that dysploidy in Brachypodium has not followed a simple progression.
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