Embryo responses to extreme water events provide insights into the behavior of Butia capitata (Arecaceae) seed banks during hydration cycles

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dc.creatorBruno Guilherme Gonçalves
dc.creatorLeonardo Monteiro Ribeiro
dc.creatorDaiane Souza Dias
dc.creatorHellen Cássia Mazzottini-dos-Santos
dc.creatorCristina de Paula Santos Martins
dc.creatorPaulo Sérgio Nascimento Lopes
dc.creatorMaria Olívia Mercadante-Simões
dc.date.accessioned2022-05-20T13:55:40Z
dc.date.accessioned2025-09-09T00:18:43Z
dc.date.available2022-05-20T13:55:40Z
dc.date.issued2019-01
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.identifier.doihttps://doi.org/10.1016/j.envexpbot.2019.103904
dc.identifier.issn0098-8472
dc.identifier.urihttps://hdl.handle.net/1843/41848
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofEnvironmental and Experimental Botany
dc.rightsAcesso Aberto
dc.subjectBancos de sementes
dc.subjectSementes - Dormência
dc.subjectÁcido abscísico
dc.subjectGlutationa
dc.titleEmbryo responses to extreme water events provide insights into the behavior of Butia capitata (Arecaceae) seed banks during hydration cycles
dc.typeArtigo de periódico
local.citation.spage103904
local.citation.volume169
local.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.
local.publisher.countryBrasil
local.publisher.departmentICA - INSTITUTO DE CIÊNCIAS AGRÁRIAS
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0098847219309566

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