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Allozyme variation in the annual weed species complex Polygonum aviculare (Polygonaceae) in relation to ploidy level and colonizing ability

par Meerts, Pierre ;Baya, T.;Lefebvre, C.
Référence Plant systematics and evolution, 211, 3-4, page (239-256)
Publication Publié, 1998

Article révisé par les pairs

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Résumé :

Variation at six polymorphic enzymatic loci was studied in 50 populations of the selfing annual Polygonum aviculare from Belgium. The results show that the P. aviculare complex has an allopolyploid origin and comprises two main genetic entities, viz. P. aviculare subsp, depressum (2n = 4x = 40), restricted to urban sites subject to trampling stress, and P. aviculare subsp, aviculare (2n = 4x = 40, 2n = 6x = 60), with a wider ecological amplitude. The latter had a higher genetic diversity and a higher frequency of fixed heterozygosity than the former. Within P. aviculare subsp. aviculare, genetic diversity and ecological amplitude correlated positively with ploidy level. Additionally, stronger genetic differentiation among and lower variation within populations was found in urban areas than in cultivated fields.