ISHS Acta Horticulturae 733: III International Grapevine Phylloxera Symposium
GENETIC STRUCTURE OF EUROPEAN POPULATIONS OF GRAPE PHYLLOXERA (DAKTULOSPHAIRA VITIFOLIAE FITCH) AS DETERMINED BY SSR-ANALYSIS |
| Authors: | S. Vorwerk, A. Forneck |
| Keywords: | Daktulosphaira vitifoliae, grape phylloxera, microsatellite, genetic structure, asexual reproduction |
| Abstract:
The genetic structure of six European populations of grape phylloxera, Daktulosphaira vitifoliae (Hemiptera: Phylloxeridae), was analyzed using six polymorphic microsatellite markers. A total of 107 multilocus genotypes were detected in 180 individuals tested. Significant deviations from Hardy-Weinberg equilibrium, negative FIS values (from -0.148 to -0.658 per population), and the presence of multicopy genotypes revealed that the current major reproductive mode at each of the locations tested is asexual. The high genotypic diversity detected within and among populations however, together with the occurrence of unique D. vitifoliae genotypes indicates rare sexual recombination events, probably prior to the multiple introductions into Europe. The absence of overlapping genotypes between the sampling sites suggests low migration rates among the populations studied and implies that the main mode of insect dispersal is via infested plant material carried by human agencies. | |
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