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MBE Advance Access published online on June 22, 2005
Molecular Biology and Evolution, doi:10.1093/molbev/msi196
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© The Author 2005. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org
Accepted June 14, 2005

Research Article

Sequence Evidence for Sporadic Inter-Generic DNA Introgression from Wheat into a Wild Aegilops Species

Sarit Weissmann 1, Moshe Feldman 1, and Jonathan Gressel 1

1 Department of Plant Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel


  Abstract

Introgressive hybridization has played a crucial role in the evolution of many plant species, especially polyploids. The duplicated genetic material and wide geographical distribution facilitates hybridization and introgression among polyploid species having either homologous or homoeologous genomes. Such introgression may lead to the production of recombinant genomes that are more difficult to form at the diploid level. Crop genes that have introgressed into wild relatives can increase the capability of the wild relatives to adapt to agricultural environments and compete with crops, or to compete with other wild species. Although the transfer of genes from crops into their con-specific immediate wild progenitors has been reported, little is known about spontaneous gene movement from crops to more distantly related species. We describe recent spontaneous DNA introgression from domesticated polyploid wheat into distantly related, wild tetraploid Aegilops peregrina (syn. Ae. variabilis), and the stabilization of this sequence in wild populations despite not having homologous chromosomes. Our results show that DNA can spontaneously introgress between homoeologous genomes of species of the tribe Triticeae and, in the case of crop-wild relatives, possibly enrich the wild population. These results also emphasize the need for fail-safe mechanisms in transgenic crops to prevent gene flow where there may be ecological risks.

Keywords: Introgression; Wheat; Triticum aestivum; Aegilops peregrina; Polyploidy; Transgenic crops.
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