An insight into the genetic polymorphism among European populations of Lactuca serriola assessed by AFLP |
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Authors: | Ale&scaron Lebeda,Miloslav Kitner,Marta Dziechciarková ,Ivana Doležalová ,Eva Kří stková ,Pim Lindhout |
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Affiliation: | 1. Palacký University in Olomouc, Faculty of Science, Department of Botany, Šlechtitel? 11, CZ-783 71 Olomouc, Czech Republic;2. Palacký University in Olomouc, Faculty of Medicine and Dentistry, Pediatric Clinic of Faculty Hospital, I.P. Pavlova 6, CZ- 775 20 Olomouc, Czech Republic;3. De Ruiter Seeds, Leeuwenhoekweg 52, P.O. Box 1050, 2660 BB Bergschenhoek, The Netherlands |
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Abstract: | Prickly lettuce (Lactuca serriola) is world-wide distributed and very variable species generally considered as a progenitor of the cultivated lettuce (Lactuca sativa). Altogether, 50 populations of L. serriola were characterized by means of amplified fragment length polymorphism (AFLP) and by isozyme analysis. Relationships among individuals and populations were examined by applying the unweighted pair-group method with the arithmetic averages (UPGMA) clustering algorithm, principal coordinate analysis (PCA) and the Nei's gene diversity index. The studied set of populations split into three main groups based on the AFLP polymorphism analysis. The first group contained L. sativa (control). The second group comprised two L. serriola accessions; one of them was identified as L. serriola f. integrifolia and the other as a mixture of two L. serriola forms. The largest and the most diverse third group contained the remaining L. serriola accessions. The population clustering corresponded approximately to their geographical distribution in Europe. At least five distinct geographic groups were recognised: 1) Northern European; 2) Slovenian; 3) very heterogeneous Central and Western European (mostly north of the Alps); 4) Mediterranean; 5) prevalence of L. serriola f. integrifolia, mostly comprising accessions from the United Kingdom and the Netherlands. This study showed that accessions originating in various eco-geographical conditions of Europe differ significantly in their genetic and protein polymorphism, as well as in morphology. Some European L. serriola populations (e.g. from Scandinavia and United Kingdom/British Isles/) seems to be isolated and homogeneous; in contrast, populations occurring in Central Europe are very diverse and genetically overlapping. |
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Keywords: | Genetic variation Geographical distribution Germplasm exploitation Isozymes Prickly lettuce |
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