INDUÇÃO DE PRIMING NO CRESCIMENTO E NA MANUTENÇÃO DO EQUILÍBRIO HÍDRICO EM MUDAS DE EUCALIPTO SUBMETIDAS A ESTRESSE POR ALAGAMENTO
DOI:
https://doi.org/10.31413/nat.v14i2.20402Palavras-chave:
déficit hídrico, estresse, hipóxia, memória fisiológica, tolerância ao alagamentoResumo
O estresse hídrico é um dos principais fatores que afetam o desenvolvimento das plantas, podendo ocorrer por alagamento ou déficit hídrico. A sobrevivência das plantas ao estresse hídrico envolve ajustes que otimizam a absorção de água e limitam as perdas por transpiração. Plantas expostas a estresses hídricos recorrentes realizam ajustes morfofisiológicos que aumentam sua tolerância. Contudo, ainda não está claro se a resposta é mais eficiente quando a planta é exposta ao mesmo estresse hídrico ou alternado entre déficit hídrico e alagamento. O objetivo do estudo foi investigar se o priming induzido por estresse recorrente de alagamento é mais eficiente do que o priming induzido por um evento de déficit hídrico. O experimento foi conduzido com mudas de eucalipto na Universidade Federal do Amapá. O experimento foi realizado em delineamento inteiramente casualizado, submetendo as plantas aos seguintes tratamentos: Controle (C), priming por alagamento (PAA), priming por déficit hídrico (PDHA) e alagamento (A). Foram analisados a taxa de crescimento e o teor relativo de água (TRA), a biomassa, a alocação de biomassa e a razão raiz/parte aérea. O priming minimizou o impacto do alagamento, e as plantas apresentaram menor decréscimo de TRA. As plantas submetidas a PAA apresentaram um menor decréscimo na taxa de crescimento quando comparadas aos outros tratamentos. As plantas submetidas a PAA apresentaram maior alocação de biomassa na raiz, o que pode ter contribuído para a manutenção do estado hídrico e do crescimento. Assim, o estresse recorrente por alagamento induziu ajustes morfológicos, o que aumentou a tolerância das plantas ao alagamento.
Palavras-chave: déficit hídrico; estresse; hipóxia; memória fisiológica; tolerância ao alagamento.
Priming induction on growth and maintenance of water balance in eucalyptus seedlings subjected to flooding stress
ABSTRACT: Water stress is one of the main factors affecting plant development, and can occur due to flooding or water deficit. Plant survival under water stress involves adjustments that optimize water absorption and limit losses through transpiration. Plants exposed to recurrent water stresses make morphophysiological adjustments that increase their tolerance. However, it is still unclear whether the response is more efficient when the plant is exposed to the same water stress or alternating stress between water deficit and flooding. The aim of the study was to investigate whether priming induced by recurrent flooding stress is more efficient than priming induced by a water deficit event. The experiment was carried out with eucalyptus seedlings at the Federal University of Amapá to the following treatments: Control (C), flooding priming (PAA), water deficit priming (PDHA), and flooding (A). Growth rate and relative water content (RWC), biomass, biomass allocation and root/shoot ratio were analyzed. Data were subjected to analysis of variance (ANOVA) and means were compared by Tukey's test (p < 0.05) using SISVAR software. Priming minimized the impact of flooding, and plants showed a smaller decrease in RWC. Plants subjected to PAA showed a smaller reduction in growth rate when compared to the other treatments. Plants subjected to PAA showed greater biomass allocation in the root, which may have contributed to the maintenance of water status and growth. Thus, recurrent flooding stress induced morphological adjustments, which increased plant tolerance to flooding.
Keywords: hypoxia; physiological memory; stress; tolerance to flooding; water deficit.
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