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AOBPreview published online on February 8, 2005
Annals of Botany, doi:10.1093/aob/mci089
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© The Author 2005. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received May 10, 2004
Revised July 29, 2004
Accepted December 22, 2004

Article

Genetic Diversity and Geographic Differentiation in Endangered Ammopiptanthus (Leguminosae) Populations in Desert Regions of Northwest China as Revealed by ISSR Analysis

XUE-JUN GE 1*, YAN YU 1, YONG-MING YUAN 2, HONG-WEN HUANG 3, and CHENG YAN 4

1 South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, P. R. China
2 South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, P. R. China; Laboratory of Evolutionary Botany, Institute of Botany, University of Neuchâtel, CH-2007 Neuchâtel, Switzerland
3 Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, P. R. China
4 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, P. R. China

* To whom correspondence should be addressed.
XUE-JUN GE, E-mail: xjge{at}scbg.ac.cn


  Abstract

• Background and Aims The desert legume genus Ammopiptanthus comprises two currently endangered species, A. mongolicus and A. nanus. Genetic variability and genetic differentiation between the two species and within each species were examined.

• Methods Inter-simple sequence repeat (ISSR) marker data were obtained and analysed with respect to genetic diversity, structure and gene flow.

• Key Results Despite the morphological similarity between A. mongolicus and A. nanus, the two species are genetically distinct from each other, indicated by 63 % species-specific bands. Low genetic variability was detected for both population level (Shannon indices of diversity Hpop = 0·106, percentage of polymorphic loci P = 18·55 % for A. mongolicus; Hpop = 0·070, P = 12·24 % for A. nanus) and species level (Hsp = 0·1832, P = 39·39 % for A. mongolicus; Hsp = 0·1026, P = 25·89 % for A. nanus). Moderate genetic differentiation was found based on different measures (AMOVA {Phi}ST and Hickory {theta}B) in both A. mongolicus (0·3743-0·3744) and A. nanus (0·2162-0·2369).

• Conclusions The significant genetic difference between the two species might be due to a possible vicariant evolutionary event from a single common ancestor through the fragmentation of their common ancestor's range. Conservation strategies for these two endangered species are proposed.

Keywords: Ammopiptanthus mongolicus, Ammopiptanthus nanus, desert, endangered plants, genetic diversity, ISSR.
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