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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/41815
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dc.creatorDaiane Souza Diaspt_BR
dc.creatorLeonardo Monteiro Ribeiropt_BR
dc.creatorPaulo Sérgio Nascimento Lopespt_BR
dc.creatorGeraldo Aclécio Melopt_BR
dc.creatorMaren Müllerpt_BR
dc.creatorSergi Munné-Boschpt_BR
dc.date.accessioned2022-05-19T13:24:50Z-
dc.date.available2022-05-19T13:24:50Z-
dc.date.issued2018-08-
dc.citation.volume122pt_BR
dc.citation.issue2pt_BR
dc.citation.spage267pt_BR
dc.citation.epage277pt_BR
dc.identifier.doihttps://doi.org/10.1093/aob/mcy065pt_BR
dc.identifier.issn1095-8290pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/41815-
dc.description.resumoBackground and Aims: Palm seeds are interesting models for studying seed reserve mobilization at the tissue level due to the abundance and complexity of reserves stored in their living endosperm cells and the development of a highly specialized haustorium. We studied structural and physiological aspects of the initial phases of reserve mobilization in seeds of a neotropical palm, Butia capitata, and sought to characterize the interactions between the different developmental pathways of the haustorium and endosperm. Methods: Morphological and histochemical evaluations of the haustorium, the endosperm adjacent to the embryo, and the peripheral endosperm of dry, imbibed, dormant seeds and seeds geminating for 2, 5 and 10 d were performed. Biochemical analyses included determinations of endo-β-mannanase activity, hormonal profiling (20 hormones belonging to eight classes) and H2O2 quantification in various tissues. Key Results: The mobilization of haustorium reserves was associated with germination and involved distinct hormonal alterations in the endosperm related to H2O2 production. The mobilization of endosperm reserves occurred as a post-germination event controlled by the seedling and involved major structural changes in the haustorium, including growth (which increased contact with, and pressure on, the endosperm) and the formation of an aerenchyma (thus facilitating O2 diffusion). The flow of O2 to the endosperm and changes in endogenous contents of H2O2 and hormones (cytokinins, auxins, brassinosteroids and ethylene) induced the establishment of an endosperm digestion zone and the translocation of reserves to the haustorium. Conclusions: The haustorium–endosperm relationship during reserve mobilization plays a pivotal role in signal integration between growth and degradation pathways in germinating seeds of Butia capitata.pt_BR
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológicopt_BR
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICA - INSTITUTO DE CIÊNCIAS AGRÁRIASpt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofAnnals of Botanypt_BR
dc.rightsAcesso Abertopt_BR
dc.subject.otherPalmeirapt_BR
dc.subject.otherSementes - Fisiologiapt_BR
dc.subject.otherEndospermapt_BR
dc.subject.otherGerminaçãopt_BR
dc.titleHaustorium-endosperm relationships and the integration between developmental pathways during reserve mobilization in Butia capitata (Arecaceae) seedspt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://academic.oup.com/aob/article/122/2/267/4999050pt_BR
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