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Forskningsartikel2001Vetenskapligt granskad

Genetic diversity in relation to sexual and asexual reproduction in populations of Melampsora larici-epitea

Samils, Berit; Stepien, Valérie; Lagercrantz, Ulf; Lascoux, Martin; Gullberg, Urban

Sammanfattning

Genetic diversity of Melampsora larici-epitea leaf rust from three cultivated stands of the willow Salix viminalis was studied using AFLP polymorphisms at 60 loci. One population was located in Northern Ireland and two in Sweden. Analysis of molecular variance (AMOVA) showed that most of the genetic variation was distributed on a fine scale within the field in all populations. Both Swedish populations displayed a very high genotypic diversity (normalized Shannon's indices of 0.95 and 1.00) and random association among loci. These results suggested that sexual reproduction had an important influence on the Swedish populations. The occurence of the alternate host (larch) adjacent to one of the Swedish rust populations did not affect the genetic diversity. However, severe rust attacks started earlier in the season in this population. The M. larici-epitea population in Northern Ireland was characterized by a low genotypic diversity (normalized Shannon's index = 0.54) and non-random association among loci was indicated by test of multilocus association and by pairwise tests among loci. These results suggested that asexual reproduction had a major effect on the genetic structure of this population, probably because of the overwintering of asexual spores and/or a population bottleneck associated with the annual sexual phase.

Nyckelord

AFLP; AMOVA; genetic structure; leaf rust; linkage disequilibrium; Salix viminalis

Publicerad i

European Journal of Plant Pathology
2001, Volym: 107, nummer: 9, sidor: 871-881
Utgivare: KLUWER ACADEMIC PUBL

      SLU författare

    • Samils, Berit

      • Sveriges lantbruksuniversitet, Sveriges lantbruksuniversitet

      • Lagercrantz, Ulf

        • Sveriges lantbruksuniversitet, Sveriges lantbruksuniversitet

        • Gullberg, Urban

          • Sveriges lantbruksuniversitet, Sveriges lantbruksuniversitet

        UKÄ forskningsämne

        Genetik
        Jordbruksvetenskap
        Skogsvetenskap

        Publikationens identifierare

        DOI: https://doi.org/10.1023/A:1013121809990

        Permanent länk till denna sida (URI)

        https://res.slu.se/id/publ/43537