TITLE Population structure and genetic diversity of an endangered species, Glyptostrobus pensilis (Cupressaceae)
AUTHOR Fagen LI
South China Botanical Garden, The Chinese Academy of Sciences, Guangzhou 510650, P.R. China
Nianhe XIA*
South China Botanical Garden, The Chinese Academy of Sciences, Guangzhou 510650, P.R. China
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ABSTRACT Glyptostrobus pensilis (Staunton ex D. Don) K. Koch is a critically endangered species, only distributed in South China and Vietnam. Genetic variation within and between populations was investigated using inter-simple sequence repeat (ISSR). One hundred and seventy individuals from fourteen populations representing five regions in southern and southeastern China were sampled. The results show that genetic diversity of G. pensilis is rather low: P = 10.2%, Ae = 1.070 and Hpop = 0.058 at population level; P = 24.7%, Ae = 1.140 and Hsp = 0.122 at species level. The results further indicate significant genetic differentiation between regions (16.10%, analysis of molecular variance [AMOVA], p<0.005), between populations within particular regions (29.76%, P<0.0002), and between individuals within populations (54.14%, P<0.0002). High levels of genetic differentiation between populations were also detected based on Nei's genetic diversity analysis (51.36%), and Shannon's diversity index (52.54%). Possible reasons for the high genetic differentiation and its low level of diversity within populations are discussed. Possible in situ and ex situ conservation strategies for G. pensilis are suggested.
KEYWORD Conservation strategies; Endangered species; Genetic diversity; Glyptostrobus pensilis; ISSR (inter-simple sequence repeat);
ARTICLE INFO Botanical Bulletin of Academia Sinica, Volume 46 Number 2 April 2005, page 155-162, 8 pages
PUBLISHER Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China