Biodiv Sci ›› 2005, Vol. 13 ›› Issue (2): 122-129.DOI: 10.1360/biodiv.040117
• Editorial •
Liqin Pan1,2, Hua Ji１, Longqing Chen１*
Adiantum reniforme var. sinense is an economically important plant species endemic to China. It is only found in a few regions of the Chongqing Municipal Region. For decades, its distribution has been shrinking as a result of over-exploitation, which has caused endangerment of this species. To assist in efforts to effectively conserve this species, we investigated the genetic variation of six natural populations using isoelectric focusing in thin-layer polyacrylamide slab gels. Fourteen loci of five enzyme systems were detected, of which seven were polymorphic. The mean number of effective alleles per locus (Ae) = 1.778, the percentage of polymorphic loci (P) = 0.441, the mean expected heterozygosity (He)= 0.199， and the mean observed heterozygosity (Ho)= 0.235. The results revealed that low levels of genetic diversity existed within the natural populations of A. reniforme var. sinense in comparison with other species of ferns. Only 1.49% of the genetic variation occurred among populations whereas 98.51% existed within populations, suggesting a very low genetic divergence among the populations. The equilibrium state of the populations was measured using Hardy-Weinberg equilibrium and the Fixation Index (F). The results showed that a mixed mating system was possibly the main heterogamy of this species, and its endangerment was caused by overexploitation and habitat loss.
Liqin Pan, Hua Ji, Longqing Chen. Genetic diversity of the natural populations of Adiantum reniforme var. sinense[J]. Biodiv Sci, 2005, 13(2): 122-129.
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