Phylogenetic study of the genus Piptadenia (Mimosoideae: Leguminosae) using plastid trnL-F and trnK/matK sequence data
Phylogenetic study of the genus Piptadenia (Mimosoideae: Leguminosae) using plastid trnL-F and trnK/matK sequence data
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DOI：
10.1600/036364407782250544
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发表时间：
2007-07-01
影响因子：
1
通讯作者：
Luckow, Melissa
中科院分区：
文献类型：
--
作者：
Jobson, Richard W.;Luckow, Melissa
我们利用来自trnL-F和trnK/matK区域的DNA序列对大约27个已知物种中的18个样本进行了Piptadenia属的系统发育研究。简约折刀的结果支持了Piptadenia是多系的假设，并且有三个独立的谱系。最大的种群形成了一个单系谱系，是含羞草的姐妹，与Piptadenia senu Barneby组密切相关。Pityrocarpa剖面的三个种（P. obliqua、P. moniliformis和P. leucoxylon）与拟拟腺属（Parapiptadenia）、Microlobius和Stryphnodendron同属一个谱系。翠绿Piptadenia viridiflora与科有远亲关系。Piptadenia和Pityrocarpa。Piptadenia剖面的特征是存在刺（针孔），潜在的突触形态将其连接到含羞草，以及聚集的穗状花序外露，总状或圆锥状。绿花木有托生刺和1-2腋生，穗状的初级花序。一种无武装的乔木（有时具硬化的，宿存的托叶），其花有弯曲的花瓣和一子房在一长雌蕊柄上。我们建议将Piptadenia viridiflora分离为一个新属，并将Piptadenia限制在Piptadenia门的其他种中。我们恢复了Pityrocarpa的属名，以涵盖Pityrocarpa分支，并作出以下新的组合：Pityrocarpa moniliformis， Pityrocarpa obliqua ssp。巴西木，和白栎木。
We undertook a phylogenetic study of the genus Piptadenia with a sample of 18 of ca. 27 recognized species using DNA sequences from the plastid trnL-F and trnK/matK regions. Parsimony jackknife results support the hypothesis that Piptadenia is polyphyletic and that there are three independent lineages. The largest groups of species form a monophyletic lineage that is sister to Mimosa and corresponds closely to Piptadenia section Piptadenia sensu Barneby. Three species (P. obliqua, P. moniliformis, and P. leucoxylon) of section Pityrocarpa are sister to species of Pseudopiptadenia in a lineage with Parapiptadenia, Microlobius and Stryphnodendron. Piptadenia viridiflora is distantly related to sects. Piptadenia and Pityrocarpa. Section Piptadenia is characterized by the presence of prickles (aculei), a potential synapomorphy linking it to Mimosa, and exserted, racemose or paniculiform inflorescences of aggregated spikes. Piptadenia viridiflora has stipular spines and 1-2 axillary, spicate primary inflorescences. Species of sect. Pityrocarpa are unarmed trees (sometimes with hardened, persistent stipules) whose flowers have recurved petals and an ovary on a long gynophore. We recommend that Piptadenia viridiflora be removed to a new genus, and that Piptadenia be restricted to the other species of sect. Piptadenia. We resurrect the generic name Pityrocarpa to encompass the Pityrocarpa clade and make the following new combinations: Pityrocarpa moniliformis, Pityrocarpa obliqua ssp. brasiliensis, and Pityrocarpa leucoxylon.