Seed morphology of the Eriostemon–Phebalium clade (Rutaceae–Zanthoxyloideae) and implications for systematics

IF 2.3 2区生物学 Q2 PLANT SCIENCES

Botanical Journal of the Linnean Society Pub Date : 2023-10-14 DOI:10.1093/botlinnean/boad055

Bokyung Choi, Marco F Duretto, Suk-Pyo Hong

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Abstract

Abstract The Eriostemon–Phebalium clade (Rutaceae) includes c. 200 species across 16 genera, and is distributed in Australia (including Tasmania), New Caledonia, New Hebrides, New Zealand, and New Guinea. Phylogenetic analyses based on DNA sequences have consistently shown that the Eriostemon–Phebalium group is robustly monophyletic. However, despite this, taxonomy within the group is still uncertain: relationships between the genera are not well understood, and the genus Philotheca is polyphyletic. Seed morphological characters can be useful in taxonomy in angiosperms, and in this study, 21 seed morphological characters for 29 taxa of all the 16 genera circumscribed in the Eriostemon–Phebalium clade were examined using stereo and scanning electron microscopy. Seed morphological traits such as testa type and hilum were informative for some of the robustly supported clades in molecular phylogenetic studies, and a combination of seed characters could be useful for species identification. This study highlights the potential of seed morphological traits for the systematics.

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花椒科花椒枝的种子形态及其分类学意义

Eriostemon-Phebalium枝(蕨科)16属约200种，分布于澳大利亚(包括塔斯马尼亚)、新喀里多尼亚、新赫布里底群岛、新西兰和新几内亚。基于DNA序列的系统发育分析一致表明，Eriostemon-Phebalium类群具有强大的单系性。然而，尽管如此，该组内的分类学仍然不确定:属之间的关系尚不清楚，而且Philotheca属是多系的。种子形态特征是被子植物分类的重要依据，本研究利用立体电镜和扫描电镜对被子植物16属29个类群的21个种子形态特征进行了研究。在分子系统发育研究中，种子的种皮类型和种门等形态特征可以为一些得到有力支持的分支提供信息，并且种子性状的组合可以用于物种鉴定。本研究强调了种子形态特征在系统学上的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Botanical Journal of the Linnean Society 生物-植物科学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

3.5 months

期刊介绍： The Botanical Journal of the Linnean Society publishes original papers on systematic and evolutionary botany and comparative studies of both living and fossil plants. Review papers are also welcomed which integrate fields such as cytology, morphogenesis, palynology and phytochemistry into a taxonomic framework. The Journal will only publish new taxa in exceptional circumstances or as part of larger monographic or phylogenetic revisions.