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Genetic divergence in Liquidambar styraciflua, L. formosana, and L. acalycina (Hamamelidaceae)



Genetic divergence in Liquidambar styraciflua, L. formosana, and L. acalycina (Hamamelidaceae)



Systematic Botany 19(2): 308-316



We investigated the patterns of genetic divergence in three Liquidambar species, L. styraciflua from the eastern United States and Mexico and L. acalycina and L. formosana from China. Estimates of genetic diversity for each species were similar to averages for plants as a whole but lower than expected for wind-pollinated, outcrossing woody plants. For L. styraciflua, almost all of the genetic variation was partitioned within populations (G(ST) = 0.106) and genetic identity among populations was high (I = 0.981). On a regional basis, the Mexican populations were more differentiated than the United States populations (G(ST) = 0.23 and I = 0.94 for the Mexican vs. G(ST) = 0.027 and I = 0.99 for the U.S.). High genetic identities between the Mexican and United States populations indicate recent contact between the two distribution centers. Genetic variation in both L. formosana and L. acalycina was found mainly within populations (G(ST) = 0.098 and 0.118 respectively). Estimates of intraspecific genetic identity were 0.976 for L. formosana and 0.939 for L. acalycina. The genetic identity between L. formosana and L. acalycina was 0.82. The divergence patterns in each of the three species have been influenced by past climatic events.

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Accession: 002390677

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DOI: 10.2307/2419604


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