Abstract
Luzula campestris, L. pallidula and tetraploi plants of this section from Ireland were studied electrophoretically. A hypothesis of alloploid origin for the Irish tetraploids from a hybrid betweenL. campestris andL. pallidula, based on the morphology, and karyology of the relevant taxa, has been tested. The presumed parental taxa are divergent in several loci,L. pallidula being highly homozygous andL. campestris moderately heterozygous. The Irish tetraploid combines the alleles of the putative parents, has no unique alleles, and exhibits a high frequency of heterozygotes, inAdh-2 andGpi-1, with invariably additive patterns. The Irish tetraploid has a low genotype diversity. The allozyme data support the hypothesis of alloploid origin for the Irish tetraploid withL. campestris andL. pallidula as possible parents.
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