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OALib Journal期刊
ISSN: 2333-9721
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不同群落类型油松居群的遗传多样性
DOI: 10.3724/SP.J.1145.2013.00421, PP. 421-425
Keywords: 油松,issr,遗传分化,群落类型,dna水平多态性
Abstract:
探讨群落差异下油松居群适应性和变异特征对油松资源管理和利用具有重要意义.采用issr分子标记方法检测我国特有树种油松居群的遗传变异，分析3个居群间的遗传分化水平，探讨影响群体遗传分化的主要因素和机制.结果表明，13个issr引物共检测到185个可重复的位点，其中多态位点168个，总多态位点百分率（p）为90.81%，平均多态位点百分率为66.38%；3个油松居群间的遗传分化系数gst平均为0.1781，表明群体间的遗传分化水平较高，遗传变异82.19%存在于群体内，居群间的基因流（nm=2.3081）相对异交风媒植物（nm=5.380）较小；3个植物群落油松居群的nei’s遗传多样性指数大小顺序为：油松+核桃楸+白桦混交林（yhb）>油松纯林（yy）>油松+华北落叶松+白桦混交林（ylb）；居群间的遗传相似度平均为0.9027；油松居群的遗传多样性与枝下高和辛普森指数呈显著正相关性；油松居群遗传变异与居群的群落特征关系密切.不同群落类型生境影响油松遗传多样性水平.
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