Monophyletic subgroups of the tribe Millettieae (Leguminosae) as revealed by phytochrome nucleotide sequence data
Monophyletic subgroups of the tribe Millettieae (Leguminosae) as revealed by phytochrome nucleotide sequence data
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DOI：
10.2307/2446334
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发表时间：
1998-03-01
影响因子：
3
通讯作者：
Sharrock, RA
中科院分区：
文献类型：
--
作者：
Lavin, M;Eshbaugh, E;Sharrock, RA
通过对豆科蝶形花科植物光敏色素（phytochrome，PHY）基因的系统发育分析，揭示了4个PHY基因位点在豆科蝶形花科植物中的同源性和亲缘关系。这两个共同形成一个单系群，是一个谱系的姐妹代表的崖豆藤组。总的来说，这个大的单系群被称为Millettieae核心群，其基于我们的采样，包括确实积累非蛋白质氨基酸刀豆氨酸的Millettieae物种，并且大多数具有假总状花序或假环状花序。这一新的系统发育框架有助于针对未来的采样额外的类群。比如积累刀豆氨酸的“美洲鱼藤”（Deguelia）可能不是Millettieae核心组的成员。Afgekia也被预测不是成员，因为它积累刀豆氨酸，并有顶生总状花序的花序。PHY基因分析特别揭示了传统上分类在Millettieae中的某些属实际上与Millettieae核心组有较远的关系，例如Austrosteensia，Callerya，Craibia，Cyclolobium，Fordia，Platycyamus，Poecilanthe和Wisteria。
Phylogenetic analysis of phytochrome (PHY) genes reveals the identity and relationships of four PHY loci among papilionoid Leguminosae, A phylogenetic analysis of loci combined according to species suggests that most of the tribe Millettieae belongs to one of two monophyletic clades: the Derris-Lonchocarpus or the Tephrosia clade. Together these two form a monophyletic group that is sister to a lineage represented bg Millettia grandis of Millettia sect. Compresso-gemmatae. Collectively, this large monophyletic group is referred to as the Millettieae-core group, which based an our sampling, includes species of Millettieae that do nut accumulate the nonprotein amino acid canavanine and that mostly have pseudoracemose or pseudopaniculate inflorescences. This new phylogenetic framework assists in targeting additional taxa for future sampling. For example. the "American Derris" (Deguelia), which accumulate canavanine, might not he members of the Millettieae core group. Afgekia is also predicted not to be a member because it accumulates canavanine and has an inflorescence of terminal racemes. PHY gene analysis specifically reveals that certain genera traditionally classified in Millettieae are actually distantly related to the Millettieae core group, such as Austrosteensia, Callerya, Craibia, Cyclolobium, Fordia, Platycyamus, Poecilanthe, and Wisteria.