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Population Genetic Structure of Aphis glycines

Permanent URL:
http://handle.nal.usda.gov/10113/34328
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 United States and Canada, suggesting large-scale dispersal and rapid adaptation 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 four alleles per locus. However, differences in genetic diversity were seen among South Korean and North American populations in terms of heterozygote excesses and genotypic richness. Within North America, two populations (Michigan and Ontario), had lower genetic diversities and exhibited high genetic differentiation compared with the remaining eight populations. The earlier collection time of Michigan and Ontario samples explained the genetic differences better than geographic subdivisions. These data indicate a pattern of small colonizing populations on soybeans, followed by rapid clonal amplification and subsequent large-scale dispersal across North America.
Author(s):
Michel, Andrew P. , Zhang, Wei , Jung, Jin Kyo , Kang, Sung-Taeg , Mian, M.A. Rouf
Subject(s):
Aphis glycines , insect pests , plant pests , population structure , population genetics , invasive species , geographical distribution , adaptation , microsatellite repeats , genetic markers , alleles , genetic polymorphism , loci , genetic variation , heterozygosity , genotype , geographical variation , clones , temporal variation , asexual reproduction , North America , South Korea
Format:
p. 1301-1311.
Note:
Includes references
Source:
Environmental entomology 2009 Aug., v. 38, issue 4
Language:
English
Year:
2009
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.