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Reviving rice

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Rice feeds over half the world population and the rice species Oryza sativa has become a model for understanding the genetics of cereal grasses. Draft sequences of the genomes of two main subspecies, japonica and indica, were generated by whole-genome shotgun sequencing and were published earlier this year. In the November 21 Nature two papers report complete sequences of rice chromosomes generated in a clone-by-clone approach by the International Rice Genome Sequencing Project. Kmita et al. report the sequence of rice chromosome 1, the longest chromosome (Nature 2002, 420:312-316). They found 6,756 coding genes within the 43.3 megabases of sequence. Almost half of these matched homologs in Arabidopsis and around a third could be functionally categorized. The most abundant gene family was the serine/threonine receptor kinases. In an accompanying paper, Feng et al. (Nature 2002, 420:316-320) report the sequence of rice chromosome 4, including the longest known sequence of a plant centromere (over 1.1 Mb). The finished sequence is 34.6 Mb long and contains 4,658 predicted coding genes. These two reports make a convincing case for the importance of high-quality finished sequences for accurate genome analysis.

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    A draft sequence of the rice genome (Oryza sativa L. ssp. japonica).

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    A draft sequence of the rice genome (Oryza sativa L. ssp. indica).

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    Nature, [http://www.nature.com]

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    RiceGAAS: chromosome 1 annotation database , [http://ricegaas.dna.affrc.go.jp/chromosome1/]

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    Reasons for finishing the rice genome , [http://demeter.bio.bnl.gov/reasons_for_finishing.html]

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Weitzman, J.B. Reviving rice. Genome Biol 3, spotlight-20021127-01 (2002) doi:10.1186/gb-spotlight-20021127-01

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Keywords

  • Rice Genome
  • Abundant Gene
  • Rice Chromosome
  • Genome Sequencing Project
  • Shotgun Sequencing