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Variation in nuclear DNA content at the species level in Armeria maritima

par Vekemans, Xavier ;Lefebvre, C. ;Coulaud, Joëlle;Blaise, Solange;Gruber, W.;Siljak-Yakovlev, Sonja;Brown, Spencer
Référence Hereditas, 124, 3, page (237-242)
Publication Publié, 1996

Article révisé par les pairs

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Résumé :

Intraspecific variation in nuclear DNA content in 19 populations of Armeria maritima was investigated. Significant differences in DNA amount among ecogeographic groups and among populations were observed. These differences are related to geographic origin, with Californian populations having 7% more DNA than their European counterparts. Within Europe, the four ecogeographic groups tested are not distinct, whatever their geographic origin (maritime versus continental) and their ecological characteristics (heavy-metal polluted versus non-toxic soils). However, significant differences in DNA amount appeared among population clusters identified from biochemical classification of European populations based on flavonoid compounds and isozyme markers. Variation in genome size among populations was found to be significantly correlated to variation in pollen size. Weak interpopulational variation has been detected for the nucleotidic base ratio, but was not correlated to variation in DNA amount.