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Döös, Sophia, 2013. Genetic differences in Lobesia botrana populations : related to host plant or geographic origin?. Second cycle, A2E. Alnarp: SLU, Department of Plant Breeding (from 130101)

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Abstract

For the past six decades the model of geographical isolation has been dominating but recently there has been a renewed interest in the possibility of sympatric speciation. Races of phytophagous insects specializing on different species of host plants have often been studied for the purpose of solving the question of sympatric speciation. I have characterized genetic differentiation
of populations of a polyphagous moth, Lobesia botrana to compare geographic separation and separation based on different host plants as potential causes for population genetic structure. I have used two molecular marker techniques: microsatellites and AFLPs, and the data was analysed using several statistical methods, with the original aim to compare which of these analyses could be most helpful in providing useful information about
genetic differentiation. Both microsatellites and AFLPs detected a genetic variance related to Geographic distance and AFLPs were able to detect significant differentiations related to host plant that the microsatellites were not able to detect. Pair wise genetic distance comparisons indicated a higher differentiation according to host plants than the differentiation according to geographic distance. On the other hand, the overall differentiation between
samples from different locations was higher than the differentiation between samples from different host plants. This indicates that a host related adaptation can be going on in L. botrana populations causing reproductive barriers between groups developing on Daphne and groups developing on
grapes, but they do not seem to have formed host races yet. Low heterozygosity values and high inbreeding coefficients in the studied populations need further studies to make strong conclusion.

Main title:Genetic differences in Lobesia botrana populations
Subtitle:related to host plant or geographic origin?
Authors:Döös, Sophia
Supervisor:Larsson, Mattias and Vezulli, Silvia and Nyabuga, Franklin and Tasin, Marco
Examiner:Geleta, Mulatu
Series:Självständigt arbete vid LTJ-fakulteten, SLU
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2013
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:None
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
Keywords:Lobesia botrana, Grapevine moth, pest, vineyard, AFLP, SSR, population genetics, Daphne gnidium
URN:NBN:urn:nbn:se:slu:epsilon-s-2337
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-2337
Subjects:Plant ecology
Animal genetics and breeding
Animal ecology
Language:English
Deposited On:30 May 2013 06:12
Metadata Last Modified:30 May 2013 06:12

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