Programa de Pós-Graduação em Biologia Vegetal, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul (UFMS), Avenida Costa e Silva, S/nº, Bairro Universitário, Campo Grande, MS, CEP 79070-900, Brasil.
Laboratório de Sistemática Vegetal, Instituto de Biociências, UFMS, Avenida Costa e Silva, S/nº, Bairro Universitário, Campo Grande, MS, CEP 79070-900, Brasil.
J Plant Res. 2023 Jul;136(4):453-481. doi: 10.1007/s10265-023-01450-y. Epub 2023 Apr 8.
The Pterocarpus clade includes 23 genera previously attributed to different Fabaceae tribes. The recent rearrangements of many genera in the clade do not recognize morphological synapomorphies. This study aimed to identify new synapomorphies for the Pterocarpus clade, to identify characters supporting inter-generic relationships currently resolved only by molecular data and to identify diagnostic characters at the genus and species levels. Subterminal leaflets of the studied genera were selected and analyzed using light and scanning electron microscopy. Ancestral reconstruction was performed using morphological and anatomical characters of 16 genera of the Pterocarpus clade. The convex epidermal relief in the region of the main vein indicated the relationship among all genera of the group. Anchor-like multicellular trichomes are features shared by Brya and Cranocarpus, which are the sister group to the other genera of the clade. Subepidermal layers are features shared by the Centrolobium, Etaballia, Paramachaerium, Pterocarpus and Tipuana genera, and the sclerenchyma sheath in the leaflet margin is reported in the Discolobium, Riedeliella and Platymiscium genera. Bulbous based glandular trichomes and vesicular glandular trichomes are diagnostic at the species level in Centrolobium and Pterocarpus, respectively. The leaflet characters investigated can be useful for the taxonomic delimitation at both the genus and species levels of the Pterocarpus clade. Our dataset provides new synapomorphies, elucidates the inter-generic relationships and reinforces the phylogenetic classification of the Pterocarpus clade resolved by molecular data.
紫檀木族包含 23 个先前属于不同豆科族的属。该族近期发生了许多属的重新排列，这些排列不再识别形态学的同源特征。本研究旨在为紫檀木族鉴定新的同源特征，确定支持目前仅通过分子数据解决的种间关系的特征，并鉴定属和种水平的诊断特征。选择了研究属的末级小叶，并使用光学显微镜和扫描电子显微镜进行了分析。使用紫檀木族 16 个属的形态学和解剖学特征进行了祖先重建。主脉区域的凸面表皮突起表明了该组所有属之间的关系。锚状多细胞毛状体是 Brya 和 Cranocarpus 的特征，它们是该族其他属的姐妹群。皮下层是 Centrolobium、Etaballia、Paramachaerium、Pterocarpus 和 Tipuana 属的共有特征，小叶边缘的厚壁组织鞘在 Discolobium、Riedeliella 和 Platymiscium 属中报道。灯泡状基生腺毛和泡状腺毛分别是 Centrolobium 和 Pterocarpus 种的诊断特征。研究的小叶特征可用于紫檀木族的属和种水平的分类学界定。我们的数据集提供了新的同源特征，阐明了属间关系，并加强了分子数据解析的紫檀木族的系统发育分类。
