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한국 특산식물의 동위효소 다양성 및 집단유전적 구조 : 2. 흑산도비비추 ( 백합과 )
정명기(Myong Gi Chung),정효기(Hye Gi Chung) 한국식물학회 1994 Journal of Plant Biology Vol.37 No.2
Levels of genetic diversity, population genetic structure, and gene flow in Hosta yingeri, a herbaceous perennial endemic to Taehuksan, Sohuksan, and Hong Islands, were investigated. Starch gel electrophoresis was conducted on leaves for 101 plants collected from three populations. Although the distribution of the spacies is restricted in the islands, it maintains high levels of genetic variation; 64% of polymorphic loci in at least one population (P_s), the mean number of alleles per locus (A_p) of 1.92, and the mean effective number of alleles per locus (Ae_p) of 1.52. Overall, mean genetic diversity (He_p=0.250) was substantially higher than mean estimate for species with very similar life history traits (0.102). Large population size, the persistence of multiple generations withing populations, high fecundity, predominantly outcrossing breeding system, large size of pollinator visitation areas may be explanation factors contributing the higher level of genetic diversity maintained within populations. Analysis of flxation indices showed an overall slight excess of heterozygotes (mean F_IS = -0.066) relative to Hardy-Weinberg expectations, which may in part be due to the near self-incompatible breeding system in the species. Significant differences in allele frequencies among populations were found for 14 out of 16 polymorphic loci ( P<0.05). Slightly more than 80% of the total variation in the species was common to all populations (G_ST = 0.198). As expected, indirect estimate of the number of migrants per generation (Nm = 0.45, calculated from mean G_ST) and nine private alleles found in the three populations indicate that gene movement among three isolated island populations was low.