As water scarcity becomes a growing threat to agriculture, scientists are searching for crop traits that help plants stay productive under drought. A new tomato study identifies the SlbHLH70 gene as a key regulator that strengthens drought tolerance and helps plants recover after rewatering. The research shows that tomatoes with higher SlbHLH70 activity survived drought better, while plants lacking the gene became more sensitive to water shortage. By linking drought resilience to abscisic acid (ABA) biosynthesis, ABA-mediated signaling, jasmonic acid (JA)-related responses, and root development, the study offers a clearer route for improving tomato adaptation to dry and unstable growing environments.
Drought is one of the most damaging abiotic stresses in crop production, reducing plant growth, development, and yield. Tomato (Solanum lycopersicum) is an economically important vegetable crop, yet its performance is strongly constrained by water deficit. Plants respond to drought through hormone signaling, stomatal regulation, osmotic adjustment, and root-system remodeling. Basic helix–loop–helix (bHLH) transcription factors are known to regulate plant development and stress responses, but the roles of many tomato bHLH genes remain poorly understood. Because of these challenges, the molecular regulators that connect drought signaling, hormone balance, and root growth in tomato require deeper investigation.
A research team from Xinjiang University and the Xinjiang Uygur Autonomous Region Academy of Agricultural Sciences reported (DOI: 10.1093/hr/uhag075) the study on March 5, 2026, in Horticulture Research. The work reveals that the SlbHLH70 gene improves tomato drought tolerance by coordinating ABA biosynthesis, abscisic acid (ABA) signal transduction, jasmonic acid (JA) accumulation, and root development, providing a candidate genetic target for breeding drought-resilient tomato varieties.
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