Abstract:
:An approximately 247-kb genomic region from FF genome of wild rice Oryza brachyantha, possessing the smallest Oryza genome, was compared to the orthologous approximately 450-kb region from AA genome, O. sativa L. ssp. japonica. 37 of 38 genes in the orthologous regions are shared between japonica and O. brachyantha. Analyses of nucleotide substitution in coding regions suggest the two genomes diverged approximately 10 million years ago. Comparisons of transposable elements (TEs) reveal that the density of DNA TEs in O. brachyantha is comparable to O. sativa; however, the density of RNA TEs is dramatically lower. The genomic fraction of RNA TEs in japonica is two times greater than in O. brachyantha. Differences, particularly in RNA TEs, in this region and in BAC end sequences from five wild and two cultivated Oryza species explain major genome size differences between sativa and brachyantha. Gene expression analyses of three ObDREB1 genes in the sequenced region indicate orthologous genes retain similar expression patterns following cold stress. Our results demonstrate that size and number of RNA TEs play a major role in genomic differentiation and evolution in Oryza. Additionally, distantly related O. brachyantha shares colinearity with O. sativa, offering opportunities to use comparative genomics to explore the genetic diversity of wild species to improve cultivated rice.
journal_name
Plant Mol Bioljournal_title
Plant molecular biologyauthors
Zhang S,Gu YQ,Singh J,Coleman-Derr D,Brar DS,Jiang N,Lemaux PGdoi
10.1007/s11103-007-9178-3subject
Has Abstractpub_date
2007-07-01 00:00:00pages
589-600issue
5eissn
0167-4412issn
1573-5028journal_volume
64pub_type
杂志文章abstract::Chemically inducible gene switches can provide precise control over gene expression, enabling more specific analyses of gene function and expanding the plant biotechnology toolkit beyond traditional constitutive expression systems. The alc gene expression system is one of the most promising chemically inducible gene s...
journal_title:Plant molecular biology
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1007/BF00042040
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
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pub_type: 杂志文章
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journal_title:Plant molecular biology
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Plant molecular biology
pub_type: 杂志文章,评审
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更新日期:2002-06-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1007/BF00015670
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pub_type: 杂志文章,评审
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
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更新日期:2009-05-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
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