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The latest genomic studies of wheat sheds new light on crop adaptation and domestication
Date:3/26/2013

of repeat expansion in the enlargement of genome size during the evolution of the Triticeae tribe of grasses.

Ae. tauschii (DD), also known as Tausch's goatgrass, is a diploid goat grass species which has contributed the D genome of common wheat. Around 8,000 years ago in the Fertile Crescent, it crossed with the tetraploid wheat T. turgidum (AABB) in rare hybridization events that resulted in the hexaploid wheat T. aestivum. However, the modern strategy of breeding for hybrid vigor has been accompanied by marked changes in patterns of gene expression.

The second manuscript, led by teams at CAAS and BGI, focuses on the genome sequencing and analysis of the wild diploid grass Ae. tauschii. They found that more than 65.9% of the Ae. tauschii genome was comprised of 410 different transposable element (TE) families, and the expansion of the Ae. tauschii genome was relatively recent and coincided with the abrupt climate change that occurred during the Pliocene Epoch. They also found the expansion of the micro-RNA miR2275 family may contribute to Ae. Tauschii' s enhanced disease resistance. Remarkably, a higher number of genes for the cytochrome P450 family were identified in Ae. tauschii (485) than sorghum (365), rice (333), Brachypodium (262) and maize (261). This family of genes has been found to be important for abiotic stress response, especially in biosynthetic and detoxification pathways.

Shancen Zhao, Project Manager of BGI, said, "Genetic improvement of crops is the key output of breeding research. The genomic data provides a valuable resource for botanists and breeders to comprehensively understand wheat's genetic diversity and evolutionary history. The two studies also represent a major step forward for improving this vital crop in the face of global climate change, growing human population, and bio-energy. "Providing the global agricultural community with these resources new resourc
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Contact: Jia Liu
liujia@genomics.cn
BGI Shenzhen
Source:Eurekalert

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