鼎湖血桐种群生物学及遗传多样性初步研究

肖 炜<sup>1; 2</sup>; 王峥峰<sup>1</sup>; 曹洪麟<sup>1</sup>; 叶万辉<sup>1*</sup>; 黄国敏<sup>1; 2</sup>

引用本文:	肖炜, 王峥峰, 曹洪麟, 叶万辉, 黄国敏.鼎湖血桐种群生物学及遗传多样性初步研究[J].广西植物,2010,(1):70-74.[点击复制]
	XIAO Wei, WANG Zheng-Feng, CAO Hong-Lin, YE Wan-Hui, HUANG Guo-Min.Population biology and genetic diversity of Macaranga sampsonii[J].Guihaia,2010,(1):70-74.[点击复制]

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鼎湖血桐种群生物学及遗传多样性初步研究
肖炜^1,2, 王峥峰¹, 曹洪麟¹, 叶万辉^1*, 黄国敏^1,2
1.中国科学院华南植物园, 广州 510650;2.中国科学院研究生院, 北京 100049

摘要:

采用点格局分析、径级结构分析以及微卫星筛选等方法,对鼎湖山保护区20 hm²永久样地中的鼎湖血桐进行了种群生物学及遗传多样性研究。结果表明:鼎湖血桐是一种r-对策型阳生植物,种群年龄结构呈金字塔型; 植株受光照不足的胁迫,种群大部分个体聚集分布于光照充足的林窗中; 通过磁珠富集法筛选出鼎湖血桐特异性微卫星引物13对,其中2对具备多态性,多态百分率为15.4%,多态信息含量在0～0.3734之间,平均期望杂合度为0.0756,远低于同属其它植物。研究表明鼎湖血桐对环境变化的适应范围较窄,遗传多样性较低,应对其种质资源进行多样性评估与保护。

关键词: 鼎湖血桐点格局分析径级结构分析微卫星 r-对策阳生植物

DOI：

分类号:Q948

基金项目:

Population biology and genetic diversity of Macaranga sampsonii

XIAO Wei^1,2, WANG Zheng-Feng¹, CAO Hong-Lin¹, YE Wan-Hui^1*, HUANG Guo-Min^1,2

1.South China Botanical Garden, the Chinese Academy of Sciences, Guangzhou 510650, China;2.Graduate School of the Chinese Academy of Sciences, Beijing 100049, China 1.South China Botanical Garden, the Chinese Academy of Sciences, Guangzhou 510650, China; 2.Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

Abstract:

An analysis of population biology and genetic diversity of Macaranga sampsonii was taken in DHS-20-hm² permanent plots,which locates on the Dinghushan natural reserve. By use of point pattern analysis and DBH-class structure analysis,it was concluded that M.sampsonii was a light-dependent egy,whose population age structure was approximately pyramid-like. The population habitat was restricted in the canopy gaps because of sunlight deficiency stress. Thirteen microsatellite loci were isolated by methods of magnetic beads enrichment,in which only two loci(15.4%)were polymorphic. The polymorphic information content of these loci ranged from 0 to 0.3734.The average expected heterozygosity of M.sampsonii was 0.0756,which was obviously lower than other Macaranga species. These results indicated that M.sampsonii was in a narrow environment adaptation range and a low population genetic diversity. We should take measures to evaluate and protect its germplasm resource.

Key words: Macaranga sampsonii Points pattern analysis DBH-class structure analysis microsatellite r-strategy light-dependent plant