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Genetic diversity of Calocedrus macrolepis (Cupressaceae) in southwestern China

机译：中国西南地区卷柏的遗传多样性

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摘要

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 H-E = 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.
机译：利用简单序列间重复序列（ISSR）标记研究了中国西南部五种Calocedrus macrolepis种群的遗传多样性和分化。揭示了低遗传多样性，多态性基因座的平均百分比为P = 26.9％，平均预期杂合度为H-E = 0.1114。根据Nei的遗传多样性分析（4.2％），Shannon的多样性指数（2.7％）和AMOVA（4.1％），在人群中发现了较低的遗传分化水平。群体之间的成对遗传同一性（I）值介于0.9899至0.9964之间，平均值为0.9932。研究人群之间的遗传距离和地理距离之间没有相关性。第四纪冰川期可能存在的遗传瓶颈，加上散落和小种群形成的遗传漂移效应，被认为是造成Calocedrus macrolepis遗传多样性低的主要原因。

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