To compare water stress tolerance traits between different fruit tree species under the same experimental conditions can provide valuable information for understanding the mechanisms underlying water stress tolerance in a broader sense. This work aimed to determine and compare the water stress tolerance of six fruit tree species typically cultivated in Mediterranean regions, i.e., pomegranate, fig, mandarin, avocado, and two Prunus species ('R40' and 'R20') and evaluate its association with water use and growth under water deficit. Iso-anisohydric behavior (low to high water stress tolerance) was assessed through a multi-trait approach and associated with growth and water use under well-watered and water deficit conditions. Avocado and mandarin were classified as species with stricter stomatal control over water potential, while pomegranate, fig, and Prunus spp. showed a lesser stomatal control. This classification was supported by the multi-traits analysis, which showed that avocado and mandarin, in contrast to the rest of the species, were characterized by more sensitive gas-exchange thresholds. A more isohydric behavior was associated with lower soil water use capacity, but higher root hydraulic conductivity, and a lower growth capacity. Some traits, such as the fraction of transpirable soil water thresholds, root hydraulic conductivity, and residual soil water content, provide valuable information to discriminate between species or genotypes that are better adapted to water deficit conditions. These traits explain the position of the species in the iso-anisohydric spectrum and allow us to understand and develop better strategies for water management in agricultural systems.

在相同实验条件下比较不同果树品种的水分胁迫耐受性状，可以为从更广泛的意义上理解水分胁迫耐受性机制提供有价值的信息。这项工作旨在确定和比较地中海地区典型种植的六种果树品种（即石榴、无花果、柑橘、鳄梨和两种李属品种（“R40”和“R20”））的水分胁迫耐受性，并评估其与水分胁迫的相关性。缺水情况下的用水和增长。通过多性状方法评估等不等水行为（从低到高的水分胁迫耐受性），并与水分充足和水分亏缺条件下的生长和水分利用相关。鳄梨和柑橘被归类为对水势具有更严格气孔控制的物种，而石榴、无花果和李属植物则被归类为对水势具有更严格控制的物种。显示出较小的气孔控制。这种分类得到了多性状分析的支持，该分析表明，与其他物种相比，鳄梨和柑橘具有更敏感的气体交换阈值。更等水的行为与较低的土壤水分利用能力有关，但与较高的根部导水率和较低的生长能力有关。一些性状，例如可蒸腾土壤水阈值的比例、根部导水率和残留土壤水含量，为区分更适合缺水条件的物种或基因型提供了有价值的信息。这些特征解释了该物种在等异水谱中的位置，使我们能够了解和制定更好的农业系统水管理策略。