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Genetic diversity and molecular evolution of Naga King Chili inferred from internal transcribed spacer sequence of nuclear ribosomal DNA

机译：从核糖体DNA的内部转录间隔区序列推断纳迦王辣椒的遗传多样性和分子进化

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摘要

Sequences of the Internal Transcribed Spacer (ITS1-5.8S-ITS2) of nuclear ribosomal DNAs were explored to study the genetic diversity and molecular evolution of Naga King Chili. Our study indicated the occurrence of nucleotide polymorphism and haplotypic diversity in the ITS regions. The present study demonstrated that the variability of ITS1 with respect to nucleotide diversity and sequence polymorphism exceeded that of ITS2. Sequence analysis of 5.8S gene revealed a much conserved region in all the accessions of Naga King Chili. However, strong phylogenetic information of this species is the distinct 13 bp deletion in the 5.8S gene which discriminated Naga King Chili from the rest of the Capsicum sp. Neutrality test results implied a neutral variation, and population seems to be evolving at drift–mutation equilibrium and free from directed selection pressure. Furthermore, mismatch analysis showed multimodal curve indicating a demographic equilibrium. Phylogenetic relationships revealed by Median Joining Network (MJN) analysis denoted a clear discrimination of Naga King Chili from its closest sister species (Capsicumchinense and Capsicumfrutescens). The absence of star-like network of haplotypes suggested an ancient population expansion of this chili.
机译：探索核糖体DNA的内部转录间隔物（ITS1-5.8S-ITS2）的序列，以研究金界辣椒的遗传多样性和分子进化。我们的研究表明在ITS地区核苷酸多态性和单体型多样性的发生。本研究表明，ITS1在核苷酸多样性和序列多态性方面的变异性超过了ITS2。 5.8S基因的序列分析显示，在长贺辣椒的所有种质中都有一个非常保守的区域。但是，该物种的强大系统发育信息是5.8S基因中明显的13 bp缺失，该基因将Naga King Chili与Capsicum sp的其余部分区分开来。中性测试结果表明存在中性变化，种群似乎在漂移-突变平衡下不断发展，并且没有定向选择压力。此外，失配分析显示多峰曲线表明人口均衡。中位连接网络（MJN）分析揭示的系统发生关系表明，金刚王辣椒与其最接近的姊妹物种（辣椒属和辣椒属）有明显的区别。没有单倍型的星形网络表明该辣椒在古代种群中扩展。

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