The meristematic activity of the endodermis and the pericycle and its role in the primary thickening of stems in monocotyledonous plants

Show simple item record Menezes, Nanuza L. de Elbl, Paula M. Cury, Graziela Appezzato-da-Gloria, Beatriz Sasaki, Karen L. M. Silva, Cristiane G. da [UNIFESP] Costa, Gisele R. Lima, Vera G. A. 2016-01-24T14:17:45Z 2016-01-24T14:17:45Z 2012-01-01
dc.identifier.citation Plant Ecology & Diversity. Abingdon: Taylor & Francis Ltd, v. 5, n. 2, p. 153-165, 2012.
dc.identifier.issn 1755-0874
dc.description.abstract Background: It had long been thought that a lateral meristem, the so-called primary thickening meristem (PTM) was responsible for stem thickening in monocotyledons. Recent work has shown that primary thickening in the stems of monocotyledons is due to the meristematic activity of both the endodermis and the pericycle.Aims: the aim of this work is to answer a set of questions about the developmental anatomy of monocotyledonous plants: (1) Do the stem apices of monocots have a special meristematic tissue, the PTM? (2) Are the primary tissues of the stem the same as those of the root? (3) Is there good evidence for the formation of both the cortex and the vascular tissue from a single meristem, the PTM, in the shoot and from two distinguishable meristems in the root? (4) If the PTM forms only the cortex, what kind of meristem forms the vascular tissue?Methods: Light microscopy was used to examine stem and root anatomy in 16 species from 10 monocotyledonous families.Results: It was observed that radially aligned cortical cells extend outwards from endodermal initial cells in the cortex of the roots and the stems in all the species. the radial gradation in size observed indicates that the cortical cells are derivatives of a meristematic endodermis. in addition, perfect continuity was observed between the endodermis of the root and that of the stem. Meristematic activity in the pericycle gives rise to cauline vascular bundles composed of metaxylem and metaphloem.Conclusion: No evidence was obtained for the existence in monocotyledons of a PTM. Monocotyledons appear to resemble other vascular plants in this respect. en
dc.description.sponsorship Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorship Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent 153-165
dc.language.iso eng
dc.publisher Taylor & Francis Ltd
dc.relation.ispartof Plant Ecology & Diversity
dc.rights Acesso restrito
dc.subject endodermal initial en
dc.subject endodermis en
dc.subject monocotyledons en
dc.subject pericycle en
dc.subject primary thickening meristem en
dc.subject stem thickening en
dc.title The meristematic activity of the endodermis and the pericycle and its role in the primary thickening of stems in monocotyledonous plants en
dc.type Artigo
dc.contributor.institution Inst Biociencias
dc.contributor.institution Universidade de São Paulo (USP)
dc.contributor.institution Universidade Federal de São Paulo (UNIFESP)
dc.contributor.institution Univ Guarulhos
dc.description.affiliation Inst Biociencias, Dept Bot, BR-0550080 São Paulo, Brazil
dc.description.affiliation Univ São Paulo, Plant Anat Lab, São Paulo, Brazil
dc.description.affiliation Universidade Federal de São Paulo, São Paulo, Brazil
dc.description.affiliation Univ Guarulhos, São Paulo, Brazil
dc.description.affiliationUnifesp Universidade Federal de São Paulo, São Paulo, Brazil
dc.identifier.doi 10.1080/17550874.2011.604925
dc.description.source Web of Science
dc.identifier.wos WOS:000311559700003


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