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United States Department of Agriculture

Agricultural Research Service

Research Project: IMPROVEMENT OF PEST RESISTANCE AND QUALITY TRAITS OF SOYBEAN

Location: Corn, Soybean and Wheat Quality Research

Title: Population genetic structure of the soybean aphid, Aphis glycines)

Author
item Michel, Andrew
item Zhang, Wei
item Jung, Jin Kyo
item Kang, Sung-taeg
item Mian, Rouf

Submitted to: Environmental Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/15/2009
Publication Date: 8/10/2009
Publication URL: http://hdl.handle.net/10113/34328
Citation: Michel, A.P., Zhang, W., Jung, J., Kang, S., Mian, R.M. 2009. Population Genetic Structure of the Soybean Aphid, Aphis glycines. Environmental Entomology. 38:1301-1311.

Interpretive Summary: The soybean aphid (Aphis glycines Matsumura) is serious pest of cultivated soybean [Glycine max (L.)] in North America. After the initial invasion in 2000, the soybean aphid has spread to most soybean growing states within few years. New biotypes of soybean aphids have been reported in USA that can overcome known aphid resistant soybean gene. It is important to study the genetics of soybean aphid biotypes. We compared the genetic diversity and the amount of genetic differentiation within and among 2 South Korean and 10 North American aphid populations for DNA markers. Overall allelic polymorphism was low, never exceeding 4 alleles per locus. However, differences in genetic diversity were seen among South Korean and North American populations. Within North America, 2 populations (Michigan and Ontario), had lower genetic diversities, and exhibited high genetic differentiation compared to the remaining 8 populations. The earlier collection time of Michigan and Ontario samples explained the genetic differences better than geography. These data indicate a pattern of small initial colonizing populations on soybeans, followed by rapid clonal amplifications and subsequent large scale dispersals across North America. These results will be helpful in developing aphid resistant soybean for USA.

Technical Abstract: The soybean aphid (Aphis glycines Matsumura) is an invasive pest of cultivated soybean [Glycine max (L.)] in North America. After the initial invasion in 2000, the aphid has quickly spread across most of the U.S. and Canada, suggesting large scale dispersals and rapid adaptations to new environments. Using microsatellite markers from closely related species, we compared the genetic diversity and the amount of genetic differentiation within and among 2 South Korean and 10 North American populations. Overall allelic polymorphism was low, never exceeding 4 alleles per locus. However, differences in genetic diversity were seen among South Korean and North American populations in terms of Fis and genotypic richness. Within North America, 2 populations (Michigan and Ontario), had lower genetic diversities, and exhibited high genetic differentiation compared to the remaining 8 populations. The earlier collection time of Michigan and Ontario samples explained the genetic differences better than geography. These data indicate a pattern of small colonizing populations on soybeans, followed by rapid clonal amplifications and subsequent large scale dispersals across North America.

Last Modified: 8/24/2016
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