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广东省中山市五桂山土沉香空间遗传结构
刘盼盼1, 廖浩斌1, 蒋谦才1, 谭宗健1, 孙红梅1, 王瑞江2, 曹洪麟2, 黄向旭2, 赖思茹2, 梁丹2, 王峥峰2
1.中山市国有森林资源保护中心, 广东 中山 528400;2.中国科学院华南植物园, 广东省应用植物学重点实验室, 广州 510650
摘要:
为了解五桂山的土沉香(Aquilaria sinensis)种群空间遗传结构,利用18个微卫星位点对143株胸高直径大于5 cm的土沉香个体基因型进行了检测。结果表明,五桂山土沉香种群的观测杂合度和期望杂合度均为0.534;近交系数为0.000 1,说明五桂山土沉香遗传多样性并不低,且种群处于随机交配状况。空间遗传结构分析结果表明,五桂山土沉香缺乏空间遗传结构,不同遗传背景的个体相互混杂,导致相邻个体遗传差异较大。这可能是五桂山土沉香种群发育过程中自疏所致,也可能是这一地区土沉香为人工种植,而非自然发育形成而造成的。
关键词:  土沉香  微卫星位点  遗传多样性  遗传景观图  空间主成分分析法  空间自相关法
DOI:10.11926/jtsb.3917
分类号:
基金项目:中山市财政局资金项目;东莞市科技项目(2015108101002);广东省科技计划项目(2017A030303060);广东省林业厅中药材保护项目;广东省林业厅野生动植物保护和湿地保护专项资金(2130299);广东省野生动植物保护管理项目资助
Spatial Genetic Structure of Aquilaria sinensis in Wuguishan, Zhongshan, Guangdong Province
LIU Pan-pan1, LIAO Hao-bin1, JIANG Qian-cai1, TAN Zong-jian1, SUN Hong-mei1, WANG Rui-jiang2, CAO Hong-lin2, HUANG Xiang-xu2, Lai Si-ru2, Liang Dan2, WANG Zheng-feng2
1.Zhongshan State-owned Forest Resources Protected Center, Zhongshan 528407, Guangdong, China;2.Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
Abstract:
In order to understand the spatial genetic structure of Aquilaria sinensis in Wuguishan, Zhongshan City, Guangdong Province, the genotypes of 143 individuals of A. sinensis with DBH (diameter at breast height) more than 5 cm were determined by using 18 microsatellite loci. The results showed that the observed heterozygosity and expected heterozygosity of A. sinensis population were all 0.534, and inbreeding coefficient was 0.000 1, which indicated that the genetic diversity of A. sinensis in Wuguishan was not low, and the whole population was under random mating situation. The genetic landscape shapes, spatial principal components analysis (sPCA) and spatial autocorrelation analysis showed A. sinensis in Wuguishan lack spatial genetic structure. The individuals with different genetic backgrounds mixed, so that the neighbors had high genetic differences. So, it was suggested that the self thinning and artificial planting of A. sinensis could be the two possible reasons.
Key words:  Aquilaria sinensis  Microsatellite loci  Genetic diversity  Genetic landscape shape  Spatial principle component analysis  Spatial autocorrelation analysis

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