安第斯山脉隆升过程中缬草属植物的形态和解剖学演化

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
R. Cruz, A. Klimeš, J. Doležal, P. Sklenář, J. Klimešová
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引用次数: 0

摘要

安第斯山脉的缬草属植物经常被认为是岛屿木质化的一个例子,即具有草本祖先的植物通常在岛屿上进化为木质化的形式。我们通过形态解剖学和系统发育分析来研究这一现象。在厄瓜多尔Páramos收集植物,描述了其营养形态。茎切片进行组织学分析。我们将这些和该属其他物种的形态解剖学数据加上最大报道大小映射到基于先前发表的序列重建的系统发育树上。南美洲瓦莱里亚纳龙的祖先比它们的全北极同类要大,其最大尺寸可能为132厘米,然后以类似布朗运动的模式进化成更大更小的尺寸,这得到了系统发育信号值的支持。我们将收集到的植物分为六种生长形式(蔷薇草本、半蔷薇草本、高架蔷薇草本、高架半蔷薇草本、灌木和藤本植物),正如我们的组织学分析所指出的那样,它们与木材的可变水平没有直接关系。然而,在木材中产生非木质化薄壁组织是非常频繁的,除了在灌木的老地区。南美缬草的祖先也很可能在其木材中有未木质化的薄壁组织。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Morphological and anatomical evolution of species of Valeriana (Caprifoliaceae) during the uplift of the Andean range
Andean species of Valeriana are frequently pointed to as an example of island woodiness, i.e. plants with herbaceous ancestors that usually evolve woodier forms on islands. We investigated this phenomenon through morphoanatomical and phylogenetic analyses. Plants were collected in the Páramos of Ecuador and had their vegetative morphology described. Stems were sectioned for histological analyses. We mapped the morphoanatomical data plus the maximum reported size for these and other species of the genus, on phylogenetic trees reconstructed on the basis of previously published sequences. Bigger than their Holarctic counterparts, the ancestor of the South American Valeriana was likely to have had a maximum size of 132 cm, and then after evolved to bigger and smaller sizes in a pattern similar to Brownian motion, as supported by phylogenetic signal values. We classified the collected plants into six growth forms (rosette herbs, semirosette herbs, elevated rosettes, elevated semirosettes, shrubs, and lianas), that are not directly related to variable levels of woodiness, as pointed out by our histological analyses. However, the production of unlignified parenchyma in the wood is very frequent, except in older regions of shrubs. The ancestor of the South American Valeriana is also very likely to have unlignified parenchyma in its wood.
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来源期刊
CiteScore
5.70
自引率
8.30%
发文量
54
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.
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