Veit M. Dörken , Philip G. Ladd , Robert F. Parsons
{"title":"The evolutionary and ecological significance of phylloclade formation: A morpho-anatomical approach","authors":"Veit M. Dörken , Philip G. Ladd , Robert F. Parsons","doi":"10.1016/j.pbi.2024.102545","DOIUrl":null,"url":null,"abstract":"<div><p>Instead of leaves, in a few species the main photosynthetic organ is a flattened structure that can be a modified branch (e.g. <em>Ruscus, Jacksonia</em>) or a fused combination of branch and leaf tissue (e.g. <em>Phyllocladus</em>) called a phylloclade. The phylloclades of <em>Phyllocladus</em> lack xeromorphic features in their wet habitat. They are broad under the low light conditions as are those of <em>Ruscus</em> which can occur in forest understories. However <em>Ruscus</em> is also common in dry habitats and shows numerous xeromorphic features. In <em>Jacksonia</em> 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.</p></div>","PeriodicalId":11003,"journal":{"name":"Current opinion in plant biology","volume":null,"pages":null},"PeriodicalIF":8.3000,"publicationDate":"2024-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1369526624000360/pdfft?md5=6f5d0c6938cb8454de87a8e6664e7f80&pid=1-s2.0-S1369526624000360-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Current opinion in plant biology","FirstCategoryId":"99","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1369526624000360","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PLANT SCIENCES","Score":null,"Total":0}
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.
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.