The sequence of rice chromosomes 11 and 12, rich in disease resistance genes and recent gene duplications.
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摘要: Background: Rice is an important staple food and, with the smallest cereal genome, serves as a reference species for studies on evolution of cereals and other grasses. Therefore, decoding its entire genome will be prerequisite applied basic research this all cereals. Results: We have determined analyzed complete sequences two chromosomes, 11 12, which total 55.9 Mb (14.3% length), based set overlapping clones. A 5,993 non-transposable element related genes are present these chromosomes. Among them 289 disease resistance-like 28 defense-response genes, higher proportion categories than any rice chromosome. three-Mb segment both chromosomes resulted from duplication 7.7 million years ago (mya), most recent large-scale in genome. Paralogous gene copies within segmental can aligned genomic assemblies sorghum maize. Although preserved their expression patterns diverged. When order 12 was compared to wheat loci, significant synteny between orthologous regions detected, illustrating presence conserved alternating recently evolved genes. Conclusion: Because resistance defense response enriched relative whole also occur clusters, they provide preferred target breeding durable isolation allelic variants. The large chromosomal coupled high density clusters makes envolved part Based syntenic alignments chromosome do not appear single whole-genome event peviously suggested.
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