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PHENETIC SIMILARITY AND GEOGRAPHIC AFFINITIES OF THE WILD SPECIES OF MALUS IN THE MOUNTAIN REGION IN W.SICHUAN(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
1997 03
Page:
218-225
Research Field:
Publishing date:

Info

Title:
PHENETIC SIMILARITY AND GEOGRAPHIC AFFINITIES OF THE WILD SPECIES OF MALUS IN THE MOUNTAIN REGION IN W.SICHUAN
Author(s):
Jiang Shunyuan Li Chaoluan
Chengdu Institute of Biology, Academia Sinica, Chengdu 610014
Keywords:
Malusphenetic taxonomyKang-Ba StripMin-Dadu River Stripgeographic affinities
CLC:
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DOI:
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Abstract:
Results from a study on phenetic numerical taxonomy of the genus Malus from W.Sichuan are presented in this paper with geographical distribution to discuss the geographical affinities of species and its distribution areas. Eleven OTUs with 48 Characters were clustered using UPGMA and WPGMA based on distance coefficient and correlation coefficient.The results indicated: 1. The dengrograms clustered by UPGMA and WPGMA based on different coefficients are very similar. The phenetic numerical taxonomy probably reveals relationships among the closely related species. 2. M.yunnanensis and M. ombrophila are very similar in morphology and their distribution is overlapped. They are always clustered in a branch of the dendrograms.The two species are sometimes difficult to be identified. 3. Evidence from phenetic analysis and distribution imply that M. transitoria and M. xiaojinensis are the vicarious species of M. daochengensis,respectively.4 The species listed in this paper fall into two different floras.M.transitoria belongs to Sno-Japanese flora,while M.toringoides to Sino-Himalayana flora.Most of the species listed here meet in the transtorial of the above two floras. 5. Obviously,a territorial strip occurs along Kangding,Litang,Batang(about (N) 30’). which is considered to be boundary of some species distributing northward and southward. The strip is named as Kang-Ba Strip.Another territorial strip is found along upper Min River and Dadu River,where some species distributing southward or northward may reach jinsha River or upper Min River through eastern region next to Kang-Ba Strip.This strip here is named as Min-Dadu River Strip.Differentiation and introgression of species may be very active in the two territory strips of W.Sichuan.6. In comparison with other regions,This study indicates that the mountain region in W.Sichuan is the center of diversity of the wild Malus species in China.

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