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Manipulation of root system architecture to optimize water and nutrient uptake is essential for maintaining plant growth under adverse environments.Three tandem repeats of a 30-bp composite ABA/stress inducible enhancer, 3xABRC321, fused to a minimal promoter linked to a specific group 3 Late Embryogenesis Abundant protein gene, HVA1, conferred low-background but high level of ABA/stress-inducible accumulation of recombinant HVA 1 (rHVA 1) in transgenic rice.