Enzyme polymorphism, morphometric variation and population structure in a restricted endemic, Silene diclinis (Caryophyllaceae)

摘要: Silene diclinis is a dioecious perennial herb, restricted to small area of the SE Spanish province Valencia. Polyacrylamide gel electrophoresis and morphometric analysis were carried out on cultivated material derived from seed collected main population S. at Jativa. Only two 26 inferred enzyme loci showed substantial variation. There was some indication subdivision in both. The esterase locus also homozygote excess within as whole one subpopulation. Morphological characters significant differentiation between subpopulations. Low allozyme variability characterizes populations most endemic species that have been investigated. Isolation historical events may important size or edaphic specialization causing this low variability. But resembles other outbreeding plants showing structure excess, suggesting within-population gene flow. Mechanisms restrict flow include environmentally-induced differences flowering time, poor dispersal possibly short pollinator foraging distances. incidence developmental abnormalities are speculatively linked with homozygosity. Storage genetic diversity space can occur well widespread sampling for banking should then be spatially representative. threatened by continued habitat loss consequent erosion; its long-term future depend bank botanic garden.