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Genetic Diversity of Wild Oat (Avena fatua) Populations from China and the United States

Published online by Cambridge University Press:  20 January 2017

Runzhi Li
Affiliation:
Department of Agronomy, China Agricultural University, Beijing, 100094, China
Shiwen Wang
Affiliation:
Department of Agronomy, China Agricultural University, Beijing, 100094, China
Liusheng Duan
Affiliation:
Department of Agronomy, China Agricultural University, Beijing, 100094, China
Zhaohu Li*
Affiliation:
Department of Agronomy, China Agricultural University, Beijing, 100094, China
Michael J. Christoffers
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
Lemma W. Mengistu
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
*
Corresponding author's E-mail: [email protected]

Abstract

Weed genetic diversity is important for understanding the ability of weeds to adapt to different environments and the impact of herbicide selection on weed populations. Genetic diversity within and among six wild oat populations in China varying in herbicide selection pressure and one population in North Dakota were surveyed using 64 polymorphic alleles resulting from 25 microsatellite loci. Mean Nei's gene diversity (h) for six wild oat populations from China was between 0.17 and 0.21, and total diversity (HT) was 0.23. A greater proportion of this diversity, however, was within (Hs = 0.19) rather than among (Gst = 0.15) populations. For the wild oat population from the United States, h = 0.24 and HT = 0.24 were comparable to the values for the six populations from China. Cluster analysis divided the seven populations into two groups, where one group was the United States population and the other group included the six Chinese populations. The genetic relationships among six populations from China were weakly correlated with their geographic distribution (r = 0.22) using the Mantel test. Minimal difference in gene diversity and small genetic distance (Nei's distance 0.07 or less) among six populations from China are consistent with wide dispersal of wild oat in the 1980s. Our results indicate that the wild oat populations in China are genetically diverse at a level similar to North America, and the genetic diversity of wild oat in the broad spatial scale is not substantially changed by environment, agronomic practices, or herbicide usage.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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References

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