Genetic diversity of Calocedrus macrolepis (Cupressaceae) in southwestern China

Genetic diversity and differentiation among five populations of Calocedrus macrolepis in southwestern China were investigated using inter-simple sequence repeats (ISSR) markers. Low genetic diversity was revealed, with mean percentage of polymorphic loci at P=26.9% and average expected heterozygosit...

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Bibliographic Details
Published in:Biochemical systematics and ecology 2004-09, Vol.32 (9), p.797-807
Main Authors: Wang, De-Lian, Li, Zhong-Chao, Hao, Gang, Chiang, Tzen-Yuh, Ge, Xue-Jun
Format: Article
Language:English
Subjects:
Calocedrus macrolepis
Cupressaceae
Genetic variation
geographical variation
ISSR
population genetics
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Summary:Genetic diversity and differentiation among five populations of Calocedrus macrolepis in southwestern China were investigated using inter-simple sequence repeats (ISSR) markers. Low genetic diversity was revealed, with mean percentage of polymorphic loci at P=26.9% and average expected heterozygosity of HE=0.1114. Low levels of genetic differentiation among populations were detected based on Nei’s genetic diversity analysis (4.2%), Shannon’s diversity index (2.7%), and AMOVA (4.1%). Pairwise genetic identity (I) values among populations ranged from 0.9899 to 0.9964, with a mean of 0.9932. There was no correlation between genetic and geographic distance among the populations studied. Possible genetic bottlenecks during Quaternary glaciations coupled with effects of genetic drift that shaped scattered and small populations were postulated to be the main reasons for the low genetic diversity in Calocedrus macrolepis.
ISSN:0305-1978
1873-2925
DOI:10.1016/j.bse.2003.12.003