作 者 ：ZHOU Qi-Xing, GE Song, GU Zhi-Jian, YUE Zhong-Shu
期 刊 ：植物分类学报 1998年 4期
Keywords:Taxus, Pseudotaxus, Genetic variation, Interspecific relationship,
Abstract:
In the present paper, genetic diversity of 12 populations of four Taxus taxa and
one species of monotypic genus Pseudotaxus in China were studied by horizontal starch gel
electrophoresis. Seven enzymes encoded by nine loci were assessed. Genetic diversity within
5 taxa were relatively high with the proportion of polymorphic loci ( P ) ranging from 44.4 %
to 77.8 %, average number of alleles per locus (A) from 1.6 to 2.1; mean expected and ob-
served heterozygosity ( He, Ho) per locus from 0. 065 to 0.152 and 0. 068 to 0.111, respec-
tively. Combined with the analysis of other characters, the results from allozyme analysis
suggest that there be very close relationships between the three species and one variety in
Taxus, with high genetic identities (I) between them(from 0. 727 to 0. 995) except those
between T. yunnanensis and other taxa in Taxus (0. 727～ 0. 804). Consequently, we pro-
pose that these taxa in Taxus be treated as different geographical races within a single
species. Also the taxonomic position of Pseudotaxus as a distinct genus is supported by our
allozyme data.