Co-overexpression of AtDREB1A and BcZAT12 increases drought tolerance and fruit production in double transgenic tomato (Solanum lycopersicum) plants

•Double transgenic (AtDREB1A and BcZAT12 gene) with promoter rd29A and lea1.•These showed higher relative water contents, chlorophyll and proline contents.•Double transgenic tomato showed reduced electrolyte leakage and lipid peroxidation.•These showed elevated expression of AtDREB1A, BcZAT12 and P5CS gene under drought stress.•Double transgenic tomato plant showed higher yield potential under drought stress.