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In this study, we investigated Arabidopsis thaliana plants with altered levels of the enzyme JASMONATE RESISTANT 1 (JAR1), which converts jasmonic acid (JA) to jasmonoyl‐l‐isoleucine (JA‐Ile). Analysis of a newly generated overexpression line (35S::JAR1) revealed that constitutively increased JA‐Ile production in 35S::JAR1 alters plant development, resulting in stunted growth and delayed flowering. Under drought‐stress conditions, 35S::JAR1 plants showed reduced wilting and recovered better from desiccation than the wild type. By contrast, jar1‐11 plants with a strong reduction in JA‐Ile content were hypersensitive to drought. RNA‐sequencing analysis and hormonal profiling of plants under normal and drought conditions provided insights into the molecular reprogramming caused by the alteration in JA‐Ile content. Especially 35S::JAR1 plants displayed changes in expression of developmental genes …