Programa de Pós-Graduação em Botânica, Coordenação de Botânica, Museu Paraense Emílio Goeldi, Belém, Pará, Brazil.
Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil.
Plant Biol (Stuttg). 2023 Oct;25(6):924-934. doi: 10.1111/plb.13563. Epub 2023 Aug 7.
Climate change is increasing the frequency of extreme events such as droughts, limiting plant growth and productivity. Exogenous application of plant growth regulators, such as 24-epibrassinolide (EBR), might be a solution as this molecule is organic, eco-friendly, and biodegradable. This is the first research to examine possible roles of EBR on the hydraulic safety margin, physiological behaviour, and metabolism in Carapa guianensis Aubl. (Meliaceae) exposed to drought. C. guianensis is a widely distributed tree in tropical forests of the Amazon. The objective was to determine whether EBR can improve tolerance to water deficit in young C. guianensis by measuring hydraulic traits, nutritional, biochemical and physiological responses, and biomass. The experiment had four randomized treatments: two water conditions (control and water deficit) and two concentrations of EBR (0 and 100 nM EBR). EBR increased the water potential and hydraulic safety margin, increased CO fixation, and improved stomatal performance. EBR also stimulated antioxidant defences (SOD, CAT, APX, and POX). Overall, tretreatment with EBR improved drought tolerance of young C. guianensis plants.
气候变化增加了干旱等极端事件的发生频率，限制了植物的生长和生产力。外源施用植物生长调节剂，如 24-表油菜素内酯（EBR），可能是一种解决方案，因为这种分子是有机的、环保的和可生物降解的。这是首次研究 24-表油菜素内酯对暴露于干旱条件下的圭亚那油梨（楝科）水力安全边际、生理行为和代谢的可能作用。圭亚那油梨是亚马逊热带雨林中广泛分布的树种。目的是通过测量水力特性、营养、生化和生理响应以及生物量，确定 EBR 是否可以提高年轻的圭亚那油梨对水分亏缺的耐受性。该实验有四个随机处理：两种水分条件（对照和水分亏缺）和两种 EBR 浓度（0 和 100 nM EBR）。EBR 增加了水势和水力安全边际，增加了 CO2 固定，并改善了气孔性能。EBR 还刺激了抗氧化防御（SOD、CAT、APX 和 POX）。总的来说，EBR 的处理提高了年轻的圭亚那油梨植物的耐旱性。
