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Category Text Publication
Reference Category Journals
DOI 10.1038/sj.hdy.6886000
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Title (Primary) Genetic diversity in peripheral and subcentral populations of Corrigiola litoralis L. (Illecebraceae)
Author Durka, W. ORCID logo
Journal Heredity
Year 1999
Department BZF
Volume 83
Issue 4
Page From 476
Page To 484
Language englisch
Keywords allozymes, genetic diversity, inbreeding, isolation, river system
Abstract Genetic diversity and differentiation were studied in Corrigiola litoralis L., an annual plant species growing on seasonally flooded river banks. Plant species that are restricted to river systems may consist of highly isolated populations. For this species, pronounced genetic differentiation among rivers was expected. Plants were sampled from the river Loire (France) representing subcentral populations and the rivers Rhine, Weser and Elbe (Germany) representing peripheral ones. Allozyme electrophoresis revealed 17 putative loci in 11 enzyme systems. At the species level, percentage polymorphic loci, mean number of alleles, observed heterozygosity and expected heterozygosity were P=29%, A=1.5 plusminus 0.2, Ho=0.007 plusminus 0.005 and He=0.065 plusminus 0.035, respectively. Peripheral populations were smaller in number and showed decreased levels of genetic diversity relative to central populations. Corrigiola litoralis was highly inbreeding as indicated by a mean FIS of 0.755. Genetic differentiation among populations was high with a mean FST-value of 0.585. Hierarchical F-statistics revealed that genetic variability was partitioned at 57% among sites, 52% among countries and 11% among sites within countries. Genetic distances between French and German populations were 0.08, indicative of considerable differentiation at the intraspecific level. The overall low level of allozyme diversity is attributed to the breeding system and to habitat conditions homogenized by regular flooding. The decrease in diversity from subcentral to peripheral populations is considered to be a result of drift and founder effects during postglacial recolonization. Peripheral populations were characterized by a single fixed allele at locus IDH, thus representing an evolutionarily significant unit.
Persistent UFZ Identifier
Durka, W. (1999):
Genetic diversity in peripheral and subcentral populations of Corrigiola litoralis L. (Illecebraceae)
Heredity 83 (4), 476 - 484