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Imbibition of Swietenia macrophylla (Meliaceae) seeds: the role of stomata

dc.contributor.authorPaiva, EAS
dc.contributor.authorLemos, J. P.
dc.contributor.authorOliveira, DMT
dc.contributor.institutionUniversidade Federal de Minas Gerais (UFMG)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:48:19Z
dc.date.available2014-05-20T13:48:19Z
dc.date.issued2006-07-01
dc.description.abstractBackground and Aims the occurrence of stomata in seed coats is uncommon and there is limited information about their function(s). The aim of this study was to verify the distribution of stomata in seed coats of Swietenia macrophylla and to relate it to the imbibition process and aspects of the structure of the outer integument layers.Methods For the structural and ultrastructural studies, the seeds were processed using the usual techniques and studied under light and scanning electron microscopes. Histochemical tests were employed to identify the cell wall composition in the different seed coat portions. To assess the role of the stomata in the imbibition, non-impervious seeds were compared with partially impervious ones, in which only the embryo, median or hilar regions were left free. Further, the apoplastic pathway marker was employed to confirm the role of the stomata as sites of water passage during imbibition.Key Results A positive relationship was observed between seed coat thickness and stomata density. The stomata were devoid of movement, with a large pore. They occurred in large numbers in the embryo region and extended with lower frequency towards the wing. Imbibition rates were related to stomata density, suggesting that the stomata act as preferential sites for water entry in the S. macrophylla seeds.Conclusions At maturity, the stomata in the seed coat play a significant role in seed imbibition. The data may also infer that these permanently opened stomata have an important role in gas exchange during seed development, aiding embryo respiration.en
dc.description.affiliationUniv Fed Minas Gerais, Inst Ciências Biol, Dept Bot, BR-31270901 Belo Horizonte, MG, Brazil
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Biociencias, Dept Bot, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Inst Biociencias, Dept Bot, BR-18618000 Botucatu, SP, Brazil
dc.format.extent213-217
dc.identifierhttp://dx.doi.org/10.1093/aob/mcl090
dc.identifier.citationAnnals of Botany. Oxford: Oxford Univ Press, v. 98, n. 1, p. 213-217, 2006.
dc.identifier.doi10.1093/aob/mcl090
dc.identifier.issn0305-7364
dc.identifier.urihttp://hdl.handle.net/11449/17222
dc.identifier.wosWOS:000238759600020
dc.language.isoeng
dc.publisherOxford University Press
dc.relation.ispartofAnnals of Botany
dc.relation.ispartofjcr3.646
dc.relation.ispartofsjr1,721
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectembryopt
dc.subjectgerminationpt
dc.subjectintegumentpt
dc.subjectmahoganypt
dc.subjectMeliaceaept
dc.subjectseedpt
dc.subjectseed anatomypt
dc.subjectseed coatpt
dc.subjectseed imbibitionpt
dc.subjectstomatapt
dc.subjectSwietenia macrophyllapt
dc.titleImbibition of Swietenia macrophylla (Meliaceae) seeds: the role of stomataen
dc.typeArtigo
dcterms.licensehttp://www.oxfordjournals.org/access_purchase/self-archiving_policyb.html
dcterms.rightsHolderOxford Univ Press
dspace.entity.typePublication
unesp.author.orcid0000-0002-1440-4810[1]
unesp.author.orcid0000-0003-1918-2433[3]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Botucatupt
unesp.departmentBotânica - IBBpt

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