Introgression from cultivated rice alters genetic structures of wild relative populations: implications for in situ conservation

AoB Plants
Xin JinBao-Rong Lu

Abstract

Maintaining genetic integrity is essential for in situ and ex situ conservation of crop wild relative (CWR) species. However, introgression of crop alleles into CWR species/populations may change their genetic structure and diversity, resulting in more invasive weeds or, in contrast, the extinction of endangered populations. To determine crop-wild introgression and its consequences, we examined the genetic structure and diversity of six wild rice (Oryza rufipogon) populations under in situ conservation in China. Thirty-four simple sequence repeat (SSR) and 34 insertion/deletion markers were used to genotype the wild rice populations and two sets of rice cultivars (O. sativa), corresponding to the two types of molecular markers. Shared alleles and STRUCTURE analyses suggested a variable level of crop-wild introgression and admixture. Principal coordinates and cluster analyses indicated differentiation of wild rice populations, which was associated with the spatial distances to cultivated rice fields. The level of overall genetic diversity was comparable between wild rice populations and rice cultivars, but a great number of wild-specific alleles was detected in the wild populations. We conclude based on the results that crop-wil...Continue Reading

References

Jul 2, 2003·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Norman C Ellstrand
Aug 16, 2003·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Z P SongB-R Lu
Nov 7, 2003·Annals of Botany·Li Juan ChenBao-Rong Lu
Sep 9, 2006·Ecology Letters·D A Andow, Claudia Zwahlen
Oct 16, 2007·Current Opinion in Genetics & Development·Eric J Baack, Loren H Rieseberg
Jun 4, 2016·Nature Plants·Bao-Rong Lu
Jul 29, 2016·Evolutionary Applications·Marco TodescoLoren H Rieseberg
Jun 1, 1967·Evolution; International Journal of Organic Evolution·Hiko-Ichi Oka, Hiroko Morishima

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Methods Mentioned

BETA
PCR
PCA
transgenic

Software Mentioned

InDel
BLAST
STRUCTURE
Microsatellite Analyser ( MSA )
Distruct
GenAlEx

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