基于核糖体rDNAITS序列变异探讨巴戟天道地性

本文应用PCR测序技术,对不同产地巴戟天(Morinda officinalis How)的rDNA ITS区片段进行检测,ITS全序列为567 bp,G/C含量为64.5%。本研究共获得17个单倍型,各单倍型呈高水平的树状演化,来自广东群体的单倍型显示是扩张的源头。分子变异等级分析(AMOVA)的计算结果显示,群体间变异占变异的比例(56.65%)大于群体内变异(43.35%),FST值为0.566 5,各群体间出现遗传分化。Mantel检验结果也显示基因流水平与地理距离呈正相关关系(R2=0.721 1),表明巴戟天群体间的亲缘关系与地理分布有较好的相关性。本研究为探讨巴戟天道地药材形成的分子机制以及谱系地理学的研究奠定基础。

Genuineness of Morinda officinalis How germplasm inferred from ITS sequences variation of nuclear ribosomal DNA

PCR sequencing ITS genes methods were used to assess the genetic diversity of Morinda officinalis How different populations. The sequence of Morinda officinalis ITS gene was 567 bp in length, and the content of G/C was 64.5%. In this study, 17 haplotypes were obtained, which were at a high level of branching, and the haplotypes of Guangdong population showed to be the expansion origin. The result of the analysis of molecular variance (AMOVA) also showed that the percentage of variation among populations (56.65%) was greater than that within a population (43.35%). The F(ST) value was 0.566 5, and the genetic divergence among populations was significant. Mantel test results also indicated that the level of geneflow was positively correlated with geographic distances (R2 = 0.721 1). The result showed a good correlation between genotype and geographic distribution of Morinda officinalis, and ITS gene sequencing could be useful molecular method for the genuineness and phylogeography of Morinda officinalis.