Climatic change forecasts suggest an increase in the frequency and severity of droughts that would affect the plant water relations and the characteristics of terrestrial ecosystems. We examined how juvenile plants of D. alata use physiological and metabolic changes to resist the drought effects in the natural environment. This study was conducted in a remnant area of Cerrado, and the effect of seasonality was assessed by the end of the dry season, at the beginning of the rainy season and during the rainy season. The decrease in rainfall resulted in changes in the plant water status, with a significant decrease in the leaf RWC, Ψs, and Fv/Fm ratio, with a concomitant increase in the VPD. The increase in the carbohydrate content resulted from starch degradation contributed to osmotic adjustment, whereas increases in proline, tryptophan, aspartate, and other derived amino acids also promoted the balance in the C/N metabolism and the maintenance of energy homeostasis during dry season. The efficiency of ROS cleaning by the antioxidant enzymes related to the AsA-GSH cycle minimized the negative impact of dehydration and prevented oxidative and nitrosative damage to the leaves of D. alata, improving its performance to cope with water deficit.

气候变化预测表明干旱的频率和严重性增加，这将影响植物水的关系和陆地生态系统的特征。我们研究了D. alata的幼株利用生理和代谢变化来抵抗自然环境中的干旱影响。这项研究是在塞拉多（Cerrado）的残余地区进行的，在旱季结束，雨季开始和雨季期间评估了季节性的影响。降雨的减少导致植物水分状况的变化，叶片的RWC 、, s和Fv / Fm的比值显着降低，同时VPD随之增加。淀粉降解导致碳水化合物含量的增加有助于渗透调节，而脯氨酸，色氨酸，天门冬氨酸和其他衍生氨基酸的增加也促进了C / N代谢的平衡和旱季能量稳态的维持。D. alata，改善其性能以应对缺水。