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Type:	Artigo de Periódico
Title:	Embryo responses to extreme water events provide insights into the behavior of Butia capitata (Arecaceae) seed banks during hydration cycles
Authors:	Bruno Guilherme Gonçalves Leonardo Monteiro Ribeiro Daiane Souza Dias Hellen Cássia Mazzottini-dos-Santos Cristina de Paula Santos Martins Paulo Sérgio Nascimento Lopes Maria Olívia Mercadante-Simões
Abstract:	Dormant 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.
Subject:	Bancos de sementes Sementes - Dormência Ácido abscísico Glutationa
language:	eng
metadata.dc.publisher.country:	Brasil
Publisher:	Universidade Federal de Minas Gerais
Publisher Initials:	UFMG
metadata.dc.publisher.department:	ICA - INSTITUTO DE CIÊNCIAS AGRÁRIAS
Rights:	Acesso Aberto
metadata.dc.identifier.doi:	https://doi.org/10.1016/j.envexpbot.2019.103904
URI:	http://hdl.handle.net/1843/41848
Issue Date:	Jan-2019
metadata.dc.url.externa:	https://www.sciencedirect.com/science/article/pii/S0098847219309566
metadata.dc.relation.ispartof:	Environmental and Experimental Botany
Appears in Collections:	Artigo de Periódico

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