Drought stress caused by water deficit reduces plant productivity in many regions of the world. In plants, basic helix-loop-helix (bHLH) transcription factors regulate a wide range of cellular activities related to growth, development and stress response; however, the role of tomato SlbHLHs in drought stress responses remains elusive. Here, we used reverse genetics approaches to reveal the function of , which is induced by drought and abscisic acid (ABA) treatment. We found that functions as a positive regulator of drought tolerance in tomato. Overexpression of in tomato improves drought tolerance by stimulating the expression of genes encoding antioxidants, ABA signaling molecules and stress-related proteins. In contrast, silencing of in tomato reduces drought tolerance. SlbHLH96 physically interacts with an ethylene-responsive factor, SlERF4, and silencing of in tomato also decreases drought tolerance. Furthermore, SlbHLH96 can repress the expression of the ABA catabolic gene, , through direct binding to its promoter. Our results uncover a novel mechanism of mediated drought tolerance in tomato plants, which can be exploited for breeding drought-resilient crops.
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| http://dx.doi.org/10.1093/hr/uhac198 | DOI Listing |
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