Study for evolutionary genomics of adaptive radiation: an analysis of speciation in endemic species of Bonin Islands.

本研究利用基因组技术对小笠原群岛特有的具有适应性辐射的植物物种进行了分析。利用RNAseq方法，利用下一代测序仪对Crepidiastrum linguifolium，C. grandicollum，C.keiskeanum和Paraixeris denticulate进行了分析。通过检测两种苋菜特有种C. linguifolium和C. grandicollum之间表达水平显着差异的基因，我们发现了一个基因，该基因是类黄酮生物合成的候选基因。此外，我们还与近缘草本植物 Crepidiastrum 属的一年生草本植物 Paraixeris denticulate 进行比较，以检测它们之间表达水平不同的基因。结果，我们检测到了两个与血管分化有关的基因。

In this study, endemic plant species of Bonin Islands with adaptive radiation t have been analysed using the genome technology.Using RNAseq method, Crepidiastrum linguifolium，C。 grandicollum, C。keiskeanum, and Paraixeris denticulate were analyzed with the next generationsequencer. As a result of detecting the genes with significantly differing expression levels between two endemic species of Crepidiastrum, C. linguifolium and C.grandicollum, we found one gene which were the candidate gene for flavonoid biosynthesis. Further, we compared with Paraixeris denticulate, an annual herb of closely related genus of Crepidiastrum, for detecting genes with different of expression level between them. As a result, we detected two genes involved in vascular differentiation.