Truncation of the calmodulin binding domain in rice glutamate decarboxylase 4 (GAD4) leads to accumulation of γ-aminobutyric acid and confers abiotic stress tolerance in rice seedlings.

Unlabelled: GABA (Gamma-aminobutyric acid) is a non-protein amino acid widely known as major inhibitory neurotransmitter. It is synthesized from glutamate via the enzyme glutamate decarboxylase (GAD). GAD is ubiquitous in all organisms, but only plant GAD has ability to bind Ca/calmodulin (CaM).