18 S. chilense, 17 S. peruvianum, 1 S. corneliomulleri, 1 S. ochranthum, 1 S. lycopersicoides Transcriptome. Solanum

The wild tomato clade (Solanum sect. Lycopersicon) is native to the western coast of South America. The section shared a last common ancestor approximately 2-3 Mya, but has since diversified into upwards of 12 species. Intraspecific variation in plant size, shape, habit, and other characters has made systematics following the morphological species concept very difficult in the group, and widespread incomplete lineage sorting (ILS) has hampered genetic studies. To better understand the ancestry of sister species, S. chilense and S. peruvianum, we conducted individual RNA sequencing on a total of 36 individuals from different populations of these two species. One individual from two outgroup species from neighboring sections were also sequenced, S. ochranthum and S. lycopersicoides.

野生番茄支系（Solanum sect. Lycopersicon，茄属番茄组）原产于南美洲西海岸。该类群的最近共同祖先约存在于200万至300万年前，此后分化出至少12个物种。植物的大小、形态、生长习性及其他性状的种内变异，使得基于形态学物种概念的该类群分类学研究极具难度；而广泛存在的不完全谱系分选（incomplete lineage sorting, ILS）也阻碍了相关遗传学研究。为更好地理解姊妹物种智利番茄（S. chilense）和秘鲁番茄（S. peruvianum）的演化起源，我们对这两个物种不同种群的共计36个个体进行了单个体RNA测序。此外，我们还对来自邻近组的2个外类群物种的各1个个体进行了测序，分别为黄茄（S. ochranthum）与拟番茄茄（S. lycopersicoides）。