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Use este identificador para citar o ir al link de este elemento: http://hdl.handle.net/1843/37202
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dc.creatorElder Antônio Sousa e Paivapt_BR
dc.date.accessioned2021-08-03T12:29:57Z-
dc.date.available2021-08-03T12:29:57Z-
dc.date.issued2016-04-
dc.citation.volume117pt_BR
dc.citation.issue4pt_BR
dc.citation.spage533pt_BR
dc.citation.epage540pt_BR
dc.identifier.doihttps://doi.org/10.1093/aob/mcw012pt_BR
dc.identifier.issn10958290pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/37202-
dc.description.resumoBackground In plants, the products of secretory activity leave the protoplast and cross the plasma membrane by means of transporters, fusion with membranous vesicles or, less commonly, as result of disintegration of the cell. These mechanisms do not address an intriguing question: How do secretory products cross the cell wall? Furthermore, how do these substances reach the external surface of the plant body? Such diverse substances as oils, polysaccharides or nectar are forced to cross the cell wall and, in fact, do so. How are chemical materials that are repelled by the cell wall or that are sufficiently viscous to not cross passively released from plant cells? Scope and Conclusions I propose a cell-cycle model developed based on observations of different secreting systems, some unpublished results and an extensive literature review, aiming to understand the processes involved in both the secretory process and the release of secretion products. In the absence of facilitated diffusion, a mechanical action of the protoplast is necessary to ensure that some substances can cross the cell wall. The mechanical action of the protoplast, in the form of successive cycles of contraction and expansion, causes the material accumulated in the periplasmic space to cross the cell wall and the cuticle. This action is particularly relevant for the release of lipids, resins and highly viscous hydrophilic secretions. The proposed cell-cycle model and the statements regarding exudate release will also apply to secretory glands not elaborated upon here. Continuous secretion of several days, as observed in extrafloral nectaries, salt glands and some mucilage-producing glands, is only possible because the process is cyclical.pt_BR
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológicopt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICB - DEPARTAMENTO DE BOTÂNICApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofAnnals of botanypt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectCell wallpt_BR
dc.subjectColleterspt_BR
dc.subjectMucilagept_BR
dc.subjectNectarpt_BR
dc.subjectPlant resinspt_BR
dc.subjectPlant secretionspt_BR
dc.subject.otherParede celularpt_BR
dc.subject.otherMucilagempt_BR
dc.subject.otherNéctar de plantaspt_BR
dc.subject.otherResinas vegetaispt_BR
dc.titleHow do secretory products cross the plant cell wall to be released? A new hypothesis involving cyclic mechanical actions of the protoplastpt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-1440-4810pt_BR
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