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      The Sorghum bicolor genome and the diversification of grasses.

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      Nature
      Springer Science and Business Media LLC

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          Abstract

          Sorghum, an African grass related to sugar cane and maize, is grown for food, feed, fibre and fuel. We present an initial analysis of the approximately 730-megabase Sorghum bicolor (L.) Moench genome, placing approximately 98% of genes in their chromosomal context using whole-genome shotgun sequence validated by genetic, physical and syntenic information. Genetic recombination is largely confined to about one-third of the sorghum genome with gene order and density similar to those of rice. Retrotransposon accumulation in recombinationally recalcitrant heterochromatin explains the approximately 75% larger genome size of sorghum compared with rice. Although gene and repetitive DNA distributions have been preserved since palaeopolyploidization approximately 70 million years ago, most duplicated gene sets lost one member before the sorghum-rice divergence. Concerted evolution makes one duplicated chromosomal segment appear to be only a few million years old. About 24% of genes are grass-specific and 7% are sorghum-specific. Recent gene and microRNA duplications may contribute to sorghum's drought tolerance.

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          Author and article information

          Journal
          Nature
          Nature
          Springer Science and Business Media LLC
          1476-4687
          0028-0836
          Jan 29 2009
          : 457
          : 7229
          Affiliations
          [1 ] Plant Genome Mapping Laboratory, University of Georgia, Athens, Georgia 30602, USA. paterson@uga.edu
          Article
          10.1038/nature07723
          19189423
          0497c01d-2d10-453b-96cd-c3ba4f14d75a
          History

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