The rubber trees (Hevea brasiliensis) are exposed to water limitations in the Amazon region that can affect its physiology, making it necessary to select genotypes that are best adapted. This study analyzed the diurnal and seasonal changes in water use and status using traits of gas exchange and water relations in ten rubber tree genotypes in the immaturity phase from large-scale clone trials at three localities in the northwestern Colombian Amazon. In San Vicente del Caguán (semi-humid warm climate), the greatest means for water-use efficiency (WUEe and WUEi) and leaf water potential (Ψ_L) were observed, in contrast with Belén de los Andaquíes (humid warm) where there was a higher relative water content (RWC). Florencia (humid warm) presented high averages for WUEe and WUEi similar to San Vicente del Caguán. The WUEe and WUEi were greater in the dry season, contrary to those observed in Ψ_L and RWC. The WUEe was higher in the time range 9:00 to 12:00, while Ψ_L had a greater mean at 3:00 and a lower average at 12:00. In the dry season, the more efficient genotypes for water use had a higher leaf water potential as well as a lower relative water content, and had an extreme anisohydric behavior. In the wet season, these had a partial isohydric strategy. The FX 4098, MDF 180 and FDR 5597 genotypes were selected because of their greater adaptive capacity for water use and status, as compared to clone IAN 873 (control), which makes them desirable for future climate drought scenarios.

橡胶树 ( Hevea brasiliensis ) 在亚马逊地区受到水限制，这会影响其生理机能，因此有必要选择最适合的基因型。本研究利用在哥伦比亚亚马逊西北部三个地区的大规模克隆试验中未成熟阶段的 10 种橡胶树基因型的气体交换和水分关系特征，分析了用水和状况的昼夜和季节变化。在圣维森特德尔卡古安（半湿润温暖的气候），水利用效率最大的装置（WUEe和WUEi）和叶水势（Ψ_大号观察）与贝伦洛斯Andaquíes（潮湿温暖）那里对比度是较高的相对含水量（RWC）。Florencia（潮湿温暖）的WUEe和WUEi平均值较高，类似于 San Vicente del Caguán。该WUEe和WUEi是更大的在干燥的季节，相反那些在观察Ψ_大号和RWC。该WUEe在时间范围9:00到12:00较高，而Ψ_大号在 3:00 具有更大的平均值，在 12:00 具有更低的平均值。在旱季，水分利用效率较高的基因型具有较高的叶水势和较低的相对含水量，并具有极端的缺水行为。在雨季，这些有部分等水策略。选择 FX 4098、MDF 180 和 FDR 5597 基因型是因为与克隆 IAN 873（对照）相比，它们对水的使用和状态具有更大的适应能力，这使它们成为未来气候干旱情景的理想选择。