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Barriers to hybridization in calcicolous and silicicolous populations of Silene nutans from Belgium

par Van Rossum, Fabienne ;De Bilde, Jacqueline ;Lefebvre, C.
Référence Belgian journal of botany, 129, 1, page (13-18)
Publication Publié, 1996

Article révisé par les pairs

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Résumé :

In Belgium, Silene nutans has evolved very distinct populations in relation to the nature of the bedrock, calcareous or siliceous: striking divergences occur in flower, infrutescence, fruit, and seeds features as well as in allozyme markers. This paper shows that barriers to crossing were strong between the two types of populations both at the prezygotic (pollen-stigma incompatibility) and postzygotic (F1 hybrids sterility) stages. Calcicolous (Ca-) and silicicolous (Si-) populations from Belgium have reached an advanced stage in the sympatric differentiation process. Such a level of differentiation is not found in other parts of Europe.