Melhoria do desempenho pós-colheita em flores de Lilium tigrinum Ker Gawl com ácido salicílico: uma molécula sinalizadora e um regulador de crescimento
DOI:
https://doi.org/10.1590/2447-536X.v31.e312826Palavras-chave:
enzimas antioxidantes, estresse oxidativo, prolina, senescência, vida de vasoResumo
A longevidade pós-colheita das flores de Lilium tigrinum (lírio-tigre) influencia diretamente seu valor comercial, destacando a necessidade de estratégias eficazes para prolongar sua vida de vaso (VV). Este estudo avalia a eficácia do ácido salicílico (AS) na concentração de 60 µM como conservante para prolongar a vida pós-colheita de flores cortadas de L. tigrinum. Os resultados mostraram que a aplicação exógena de AS estendeu significativamente a VV ao melhorar a absorção relativa de água, reduzir a carga microbiana e estabilizar vários parâmetros bioquímicos. O tratamento com AS inibiu a atividade da lipoxigenase, uma enzima chave envolvida na peroxidação lipídica, mitigando assim o estresse oxidativo. Este efeito protetor foi alcançado ao aumentar a capacidade de eliminação de espécies reativas de oxigênio (ROS), evidenciado pelo aumento do conteúdo fenólico total e das atividades elevadas de enzimas antioxidantes como superóxido dismutase (SOD), catalase (CAT) e ascorbato peroxidase (APX). Consequentemente, os níveis de peroxidação lipídica da membrana foram significativamente reduzidos. Além disso, o tratamento com AS aumentou o conteúdo total de proteínas solúveis, elevou a acumulação de prolina, diminuiu a atividade específica de proteases e manteve níveis mais baixos de aminoácidos. Essas melhorias na estabilidade fisiológica e bioquímica podem aumentar significativamente a viabilidade econômica da floricultura, prolongando a longevidade pós-colheita e mantendo a integridade estética das flores cortadas, atendendo assim à crescente demanda global por produtos florais de qualidade.
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