FAMILIAL PLACEMENT AND RELATIONS OF REHMANNIA AND TRIAENOPHORA (SCROPHULARIACEAE SL) INFERRED FROM FIVE GENE REGIONS
FAMILIAL PLACEMENT AND RELATIONS OF REHMANNIA AND TRIAENOPHORA (SCROPHULARIACEAE SL) INFERRED FROM FIVE GENE REGIONS
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DOI：
10.3732/ajb.0800195
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发表时间：
2009-02-01
影响因子：
3
通讯作者：
Smith, James F.
中科院分区：
文献类型：
--
作者：
Xia, Zhi;Wang, Yin-Zheng;Smith, James F.
基于进化的精确分类系统对于生物学研究是必不可少的。最近分子系统发育学的兴起使被子植物的分类得到了很大的改进。自确定玄参科具有多系性以来，已鉴定出5个以上的系统发育谱系；然而，关于未归属于玄参科地黄属的问题仍然存在。和三角棘虫属就是这样的属，它们的家族位置不确定。也有争论是否Triaenophora应该从地黄分离出来。目的评价地黄属植物与Triaenophora属植物的系统发育关系，寻找其最近的亲缘关系。为了验证它们的家族定位，我们对一个核DNA （ITS）区域和四个叶绿体DNA基因区域（trnL-F、rps16、rbcL和rps2）的序列进行了单独和组合的系统发育分析。分析结果表明，地黄和Triaenophora均为单系植物，是龙葵科的姐妹植物。植物化学和形态数据证实了这一关系。基于这些数据，我们认为地黄和Triaenophora代表了山蕨科（包括椴树属）其余部分的第二个非寄生分支姐妹。
Accurate classification systems based on evolution are imperative for biological investigations. The recent explosion of molecular phylogenetics has resulted in a much improved classification of angiosperms. More than five phylogenetic lineages have been recognized from Scrophulariaceae sensu lato since the family was determined to be polyphyletic; however, questions remain about the genera that have not been assigned to one of the segregate families of Scrophulariaceae s.l. Rehmannia Liboschitz. and Triaenophora Solereder are such genera With uncertain familial placement. There also is debate whether Triaenophora should be segregated from Rehmannia. To evaluate the phylogenetic relations between Rehmannia and Triaenophora, to find their closest relatives. and to verify their familial placement, we conducted phylogenetic analyses of the sequences of one nuclear DNA (ITS) region and four chloroplast DNA gene regions (trnL-F, rps16, rbcL, and rps2) individually and combined. The analyses showed that Rehmannia and Triaenophora are each strongly supported as monophyletic and together are sister to Orobanchaceae. This relation was corroborated by phytochemical and morphological data. Based on these data, We Suggest that Rehmannia and Triaenophora represent the second nonparasitic branch sister to the remainder of Orobanchaceae (including Lindenbergia).