Systematic position of the anomalous genus Cadia and the phylogeny of the tribe Podalyrieae (Fabaceae)
Systematic position of the anomalous genus Cadia and the phylogeny of the tribe Podalyrieae (Fabaceae)
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DOI：
10.1600/036364408783887500
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发表时间：
2008-01-01
影响因子：
1
通讯作者：
van der Bank, Michelle
中科院分区：
文献类型：
--
作者：
Boatwright, James S.;Savolainen, Vincent;van der Bank, Michelle
Podalyrieae部落是一组蝶形豆科植物，主要分布于南非的开普弗洛里斯特角地区，具有火生存策略，既有不发芽的物种，也有发芽的物种。利用从核糖体DNA内部转录间隔区(ITS)获得的基因序列和叶绿体rbcL基因(107种)对该部落进行了系统发育研究。在部落中发现了几个支派。剑尾亚族由两属和剑尾亚族组成。Podalyriinae亚族为副反应性。根据本研究的结果，毒蛾属(花瓣毒蛾除外)和毒蛾属(Podalyria)是姊妹属，而铁杆菌属(Stirtonanus)是它们的姊妹属。虽然Podalyria和Stirtonanus是单系，但Liparia的单系仍然不确定。维吉莉亚和加尔普尼亚有密切的亲缘关系，而黑眼莲在部落中保持着孤立的、单一的地位。Cadia是单系种，与Podalyrieae的其他成员是姐妹。到目前为止，这个属的位置一直是不确定的，因为他们的辐射对称的花在菊科豆科植物中是不寻常的。本研究的资料表明，辐射对称的花可能被解释为Cadia的一个同型，它与Podalyrieae有许多共同的特征。因此，我们建议将Cadia从Sophoreae部族转移到Podalyrieae。Podalyrieae S.S.族根节的年龄。使用非参数速率平滑(NPR)方法估计为30.5+/-260万年(Ma)，使用贝叶斯松弛时钟估计为34.7 Ma(可信区间：25.1-44.1 Ma)，表明在中新世中晚期和上新世早期发生了一次大辐射。最后，我们发现非发芽物种的分子进化速度高于发芽物种。
Tribe Podalyrieae is a group of papilionoid legumes that are largely endemic to the Cape Floristic Region of South Africa, possessing fire survival strategies with both nonsprouting and sprouting species. A phylogenetic study of the tribe was undertaken using gene sequences obtained from the internal transcribed spacer (ITS) of nuclear ribosomal DNA as well as the plastid rbcL gene (107 species). Several clades were identified within the tribe. Subtribe Xiphothecinae consists of the genera Amphithalea and Xiphotheca. Subtribe Podalyriinae was paraphyletic. Based on the results of this study, Liparia (except L. calycina) and Podalyria are sister genera with Stirtonanthus sister to both of these. While Podalyria and Stirtonanthus are monophyletic, the monophyly of Liparia is still uncertain. Virgilia and Calpurnia are closely related and Cyclopia retains an isolated, monophyletic position within the tribe. Cadia is monophyletic and sister to the rest of the Podalyrieae. The placement of this genus has, until now, been uncertain due to their actinomorphic flowers that are unusual among papilionoid legumes. The data from this study indicate that actinomorphic flowers may be interpreted as an apomorphy for Cadia and it shares many characters with Podalyrieae. We therefore propose that Cadia be transferred to Podalyrieae from the paraphyletic tribe Sophoreae. The age of the root node of the tribe Podalyrieae s.s. was estimated at 30.5 +/- 2.6 million years (Ma) using nonparametric rate smoothing (NPRS) and 34.7 Ma (confidence intervals: 25.1-44.1 Ma), using a Bayesian relaxed clock, indicating that a major radiation has taken place during the middle to late Miocene and early Pliocene. Finally, we found that nonsprouting species have a higher rate of molecular evolution than sprouting species.