New Insights into Oryza Genome Evolution: High Gene Colinearity and Differential Retrotransposon Amplification

Overview

Journal Plant Mol Biol

Date 2007 May 31

PMID 17534720

Citations 7

Authors

Shibo Zhang

Yong Qiang Gu

Jaswinder Singh

Devin Coleman-Derr

Darshan S Brar

Ning Jiang

Peggy G Lemaux

Affiliations

Soon will be listed here.

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.

Citing Articles

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