ISSN:
1570-7458
Keywords:
Brevicoryne brassicae
;
cellulose acetate
;
electrophoresis
;
allozyme variation
;
population structure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Allozymes from individual aphids were used as markers to examine the structure of Brevicoryne brassicae colonies collected from field experiments at Horticulture Research International, Wellesbourne, during the summers of 1991, 1992 and 1993. Eighteen enzyme systems were examined using cellulose acetate electrophoresis, but only 6-phosphogluconate dehydrogenase (6-PGDH) showed polymorphism (three alleles) in the samples. There were significant differences in gene frequencies between populations at some sites within 1 kilometre and between times of sampling, with an increase in the proportion of the most common genotype AA later in the season, possibly due to selection during the summer of the best adapted clones. These changes in gene frequency might produce biased results in trials screening brassica crops against aphids.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00187507
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