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Unexpectedly high genetic variation in large unisexual clumps of the subdioecious plant Honckenya peploides(Caryophyllaceae)

Sanchez Vilas, Julia, Philipp, M. and Retuerto, R. 2010. Unexpectedly high genetic variation in large unisexual clumps of the subdioecious plant Honckenya peploides(Caryophyllaceae). Plant Biology 12 (3) , pp. 518-525. 10.1111/j.1438-8677.2009.00231.x

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Honckenya peploides is a subdioecious dune plant that reproduces both sexually and by clonal growth. In northwest Spain this species was found to exhibit an extreme spatial segregation of the sexes, and our objective was to investigate genetic variation in unisexual clumps. Genetic variation was studied in six unisexual clumps of H. peploides, three of them exclusively composed of males and three exclusively female. In total, 193 samples were analysed using isozyme analysis and 80 samples were analysed using two AFLP primer combinations. Both techniques revealed considerably high genetic diversity (average proportion of distinguishable genotypes: 0.22 for isozymes and 0.36 for AFLP; average Simpson’s D: 0.65 for isozymes and 0.68 for AFLP). Our results show that, in spite of clonal growth, each unisexual clump consists of different genotypes. Genetic diversity within clumps is similar for both sexual morphs. Reasons for unisexuality of the clumps are discussed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QH Natural history > QH426 Genetics
Q Science > QK Botany
Uncontrolled Keywords: AFLP; clonal growth; genetic variation; isozymes; sexual dimorphism; spatial segregation
Publisher: John Wiley & Sons
ISSN: 1435-8603
Last Modified: 04 Jun 2017 04:37

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