The evolutionary and ecological significance of phylloclade formation: A morpho-anatomical approach

IF 8.3 2区 生物学 Q1 PLANT SCIENCES
Veit M. Dörken , Philip G. Ladd , Robert F. Parsons
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引用次数: 0

Abstract

Instead of leaves, in a few species the main photosynthetic organ is a flattened structure that can be a modified branch (e.g. Ruscus, Jacksonia) or a fused combination of branch and leaf tissue (e.g. Phyllocladus) called a phylloclade. The phylloclades of Phyllocladus lack xeromorphic features in their wet habitat. They are broad under the low light conditions as are those of Ruscus which can occur in forest understories. However Ruscus is also common in dry habitats and shows numerous xeromorphic features. In Jacksonia extensive sclerenchyma and thick cuticle protect the phylloclades from desiccation damage in xeric seasonal conditions. Despite former contrary definitions of phylloclades we advocate they be defined as pseudo-petiolate organs determinate in growth which arise from axillary buds in the axil of reduced leaves and resemble a leaf.

植物叶片形成的进化和生态意义:形态解剖学方法
少数物种的主要光合器官不是叶片,而是扁平的结构,可以是改良的枝条(如 Ruscus、Jacksonia),也可以是枝条和叶片组织的融合体(如 Phyllocladus),称为叶片。Phyllocladus 的叶片在潮湿的生境中缺乏异形特征。在低光照条件下,它们的叶片宽大,就像那些可能出现在林下的 Ruscus 一样。不过,Ruscus 在干燥生境中也很常见,并显示出许多异形特征。在杰克逊娅(Jacksonia)中,广泛的韧皮部和厚厚的角质层可以保护叶片在干旱的季节条件下免受干燥的损害。尽管以前对叶片的定义与此相反,但我们仍主张将其定义为生长确定的假叶柄器官,这些器官来自退化叶腋中的腋芽,与叶片相似。
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
Current opinion in plant biology
Current opinion in plant biology 生物-植物科学
CiteScore
16.30
自引率
3.20%
发文量
131
审稿时长
6-12 weeks
期刊介绍: Current Opinion in Plant Biology builds on Elsevier's reputation for excellence in scientific publishing and long-standing commitment to communicating high quality reproducible research. It is part of the Current Opinion and Research (CO+RE) suite of journals. All CO+RE journals leverage the Current Opinion legacy - of editorial excellence, high-impact, and global reach - to ensure they are a widely read resource that is integral to scientists' workflow.
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