**7.5. Hormone and stress**

Global transcriptome profiling of exogenously applied ABA tomato seedling revealed the identification of a large number of genes related to various stress responses [31]. These included several transcription factors, heat shock proteins, and pathogen resistance. Apart from this, salicylic acid, jasmonic acid, and ethylene signaling pathways were upregulated by exogenous ABA. The study suggested the role of ABA in improving pathogen resistance and abiotic stress tolerance. Moreover, the tomato transgenic lines were developed with the overexpression of Sly-miR169c, a miR169 family member. The transgenic plants displayed reduced stomatal opening, decreased transpiration rate, reduced water loss, and enhanced drought tolerance [159].
