Genetic variation between and within populations of a perennial grass: Arrhenatherum elatius

摘要: Three pairs of adjacent populations Arrhenatherum elatius were studied both for their genetic diversity and genotypic structure. Each pair consisted one population on a normal soil type the other spoil from mining. Using morphological characters as well allozyme markers, in toxic soils (mining spoil) was found to be higher than pasture. This suggests that tolerant have been built up large number genotypes emanating pasture which tolerance genes are not uncommon. The has then maintained by spatial heterogeneity habitats, or less intense selective forces biotic origin (e.g. intraspecific competition) more open breeding system. Variations allozymes gave interesting clues. No clear cut differences structure between found, but there heterozygote deficit denser populations. might arise inbreeding because limited gene flow dense sparse partly result effectively greater into these individuals must trap pollen longer distances do