Am J Bot. 1997 Jul;84(7):956.
Phylogenetic relationships of eight species of Saintpaulia H. Wendl., 19 species of Streptocarpus Lindl. (representing all major growth forms within the genus), and two outgroups (Haberlea rhodopensis Friv., Chirita spadiciformis W. T. Wang) were examined using comparative nucleotide sequences from the two internal transcribed spacers (ITS) of nuclear ribosomal DNA. The length of the ITS 1 region ranged from 228 to 249 base pairs (bp) and the ITS 2 region from 196 to 245 bp. Pairwise sequence divergence across both spacers for ingroup and outgroup species ranged from 0 to 29%. Streptocarpus is not monophyletic, and Saintpaulia is nested within Streptocarpus subgenus Streptocarpella. Streptocarpus subgenus Streptocarpus is monophyletic. The ITS sequence data demonstrate that the unifoliate Streptocarpus species form a clade, and are also characterized by a unique 47-bp deletion in ITS 2. The results strongly support the monophyly of (1) Saintpaulia, and (2) Saintpaulia plus the African members of the subgenus Streptocarpella of Streptocarpus. The data suggest the evolution of Saintpaulia from Streptocarpus subgenus Streptocarpella. The differences in flower and vegetative characters are probably due to ecological adaptation leading to a relatively rapid radiation of Saintpaulia.
使用核核糖体 DNA 的两个内部转录间隔区（ITS）的比较核苷酸序列，研究了 8 种圣帕特里夏（Saintpaulia）物种、19 种斯特雷普卡鲁斯（Streptocarpus）林德尔（Lindl.）物种（代表属内的所有主要生长形式）以及两个外群（Haberlea rhodopensis Friv.、Chirita spadiciformis W. T. Wang）的系统发育关系。ITS1 区的长度范围为 228 到 249 个碱基对（bp），ITS2 区的长度范围为 196 到 245 bp。内群和外群物种的两个间隔区内的成对序列差异范围为 0 到 29%。斯特雷普卡鲁斯（Streptocarpus）不是单系的，圣帕特里夏（Saintpaulia）嵌套在斯特雷普卡鲁斯（Streptocarpus）的亚种斯特雷普卡佩拉（Streptocarpella）内。斯特雷普卡鲁斯（Streptocarpus）亚种斯特雷普卡鲁斯（Streptocarpus）是单系的。ITS 序列数据表明，单叶斯特雷普卡鲁斯（Streptocarpus）物种形成一个分支，并且在 ITS2 中还具有独特的 47-bp 缺失。结果强烈支持圣帕特里夏（Saintpaulia）的单系性，以及（2）圣帕特里夏（Saintpaulia）加上斯特雷普卡鲁斯（Streptocarpus）亚种斯特雷普卡佩拉（Streptocarpella）的非洲成员的单系性。数据表明，圣帕特里夏（Saintpaulia）是从斯特雷普卡鲁斯（Streptocarpus）亚种斯特雷普卡佩拉（Streptocarpella）进化而来的。花和营养器官特征的差异可能是由于生态适应导致圣帕特里夏（Saintpaulia）相对快速辐射的结果。
