Genetic Variation and Relationships Within Taxus and Between the Genus and Pseudotaxus in China

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Genetic Variation and Relationships Within Taxus and Between the Genus and Pseudotaxus in China

ZHOU Qi-Xing, GE Song, GU Zhi-Jian, YUE Zhong-Shu

Received:1900-01-01 Revised:1900-01-01 Online:1998-07-10 Published:1998-07-10
Contact: ZHOU Qi-Xing

Abstract

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.

Key words: Taxus, Pseudotaxus, Genetic variation, Interspecific relationship

ZHOU Qi-Xing, GE Song, GU Zhi-Jian, YUE Zhong-Shu. Genetic Variation and Relationships Within Taxus and Between the Genus and Pseudotaxus in China[J]. .

[1]	ZHOU Qi-Xing, GU Zhi-Jian, YUE Zhong-Shu. Karyomorphology and relationships of Amentotaxus Pilg. [J]. , 2000, 38(6): 522-527.
[2]	ZHOU Yong-Hong, ZHENG You-Liang, YANG Jun-Liang, YEN Chi, JIA Ji-Zeng. Relationships among Kengyilia species assessed by RAPD markers [J]. , 2000, 38(6): 515-521.
[3]	JING Wang-Chun, XU Jie-Mei, YANG Lei. A study on cytotaxonomy of Sect. Anguinum of Allium [J]. , 1999, 37(1): 20-34.
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[11]	Ma Hong, Zhang Zheng-Dong, Li Liang-Bi, Ma Gui-Zhi, Zhai Xiao-Jing, Zhou Pei-Zhen. A Comparative Study on Function and Membrane Proteins of Chloroplasts of Three Species of Cephalotaxus in Late Winter [J]. , 1986, 24(6): 428-433.
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Genetic Variation and Relationships Within Taxus and Between the Genus and Pseudotaxus in China

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