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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/41848
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dc.creatorBruno Guilherme Gonçalvespt_BR
dc.creatorLeonardo Monteiro Ribeiropt_BR
dc.creatorDaiane Souza Diaspt_BR
dc.creatorHellen Cássia Mazzottini-dos-Santospt_BR
dc.creatorCristina de Paula Santos Martinspt_BR
dc.creatorPaulo Sérgio Nascimento Lopespt_BR
dc.creatorMaria Olívia Mercadante-Simõespt_BR
dc.date.accessioned2022-05-20T13:55:40Z-
dc.date.available2022-05-20T13:55:40Z-
dc.date.issued2019-01-
dc.citation.volume169pt_BR
dc.citation.spage103904pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.envexpbot.2019.103904pt_BR
dc.identifier.issn0098-8472pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/41848-
dc.description.resumoDormant seed embryos in seed banks can experience hydration cycles that subject them to water stress (WS) and then fast hydration (FH). Physiological and cytological aspects of embryos of the Cerrado (neotropical savanna) palm Butia capitata were evaluated when subjected to osmotically induced WS and FH. The water potential (ψw), viability, and vigor of dehydrated or hydrated embryos were determined after immersion in osmotic solutions. Embryos were submitted to FH (ψw =0 MPa), moderate WS (ψw = −1 and −2 MPa), and severe WS (ψw = −2 and −4 MPa). Indicators of oxidative stress (H2O2, O2−, MDA, and CAT, SOD, and APX activities), membrane functionality (electrical conductivity and leaching of K+, Mg2+, and Ca2+), and ABA content were evaluated. The ultrastructures of dehydrated embryos and hydrated embryos submitted to ψw = 0, −1, and −2 MPa were evaluated. Dehydrated embryos (ψw = −8.5 MPa) showed high tolerance to WS that was related to their abundant protein reserves, SOD activities, and high ABA contents. Embryos tolerate FH and hydration makes ψw = −0.2 MPa. Hydrated embryos also show high tolerance to WS, which is related to their control of oxidative stress and increases in their ABA contents. Loss of viability under severe WS occurs associated with the blockage of protein mobilization, loss of membrane functionality, and the collapse of cellular structure. Embryo tolerance to WS and FH is crucial to the resilience of B. capitata seed banks exposed to hydration cycles in the seasonal Cerrado biome environment.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.ispartofEnvironmental and Experimental Botanypt_BR
dc.rightsAcesso Abertopt_BR
dc.subject.otherBancos de sementespt_BR
dc.subject.otherSementes - Dormênciapt_BR
dc.subject.otherÁcido abscísicopt_BR
dc.subject.otherGlutationapt_BR
dc.titleEmbryo responses to extreme water events provide insights into the behavior of Butia capitata (Arecaceae) seed banks during hydration cyclespt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.sciencedirect.com/science/article/pii/S0098847219309566pt_BR
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