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在旱棚盆栽条件下研究了干旱对不同花生品种叶片碳同位素辨别力（Δ）和水分利用效率（ＷＵＥ）的影响，分析了Δ与ＷＵＥ及其与比叶重（ＳＬＷ）在不同水分条件下关系的稳定性。结果表明：ＷＵＥ和Δ在不同基因型间存在显著差异，但两指标在不同水分胁迫条件下基因型间的排序基本一致，说明两指标主要受遗传控制，基因型×环境互作影响较小。ＷＵＥ与Δ在不同水分状况下均呈显著负相关（ｒｃｋ＝－０．８６，Ｐ＜０．０５；ｒｓｔ＝－０．８４，Ｐ＜０．０５）。二者关系的稳定性分析说明：无论浇水还是干旱条件下，测定叶片Δ值均可以作为ＷＵＥ的有效选择指标。Δ与ＳＬＷ也存在显著负相关（ｒｃｋ＝－０．８４，Ｐ＜０．０５；ｒｓｔ＝－０．８３，Ｐ＜０．０５），说明厚叶品种碳同位素辨别力（Δ）低，水分利用效率（ＷＵＥ）高。ＳＬＷ可以作为Δ更快速更经济的替代指标。
The effect of drought on carbon isotope discrimination (Δ) and water use efficiency (WUE) of different peanut cultivars was studied under drought greenhouse conditions. The effects of Δ and WUE and SLW on the water use efficiency The stability of the relationship. The results showed that WUE and Δ were significantly different among different genotypes, but the two genotypes were basically the same among different genotypes under different water stress conditions, indicating that the two indexes were mainly controlled by the genotype, and the genotype × environment interaction had little effect. There was a significant negative correlation between WUE and Δ under different water conditions (rck = -0.86, P <0.05; rst = -0.84, P <0.05). The stability of the relationship between the two shows that: whether watering or drought conditions, the determination of leaf Δ value can be used as an effective selection indicator of WUE. There was also a significant negative correlation between Δ and SLW (rck = -0.84, P <0.05; rst = -0.83, P <0.05), indicating that the carbon isotope discriminance (Δ) High utilization efficiency (WUE). SLW can be used as a faster and more economical alternative to Δ.