seedlingsPrevious studies have shown that SlTIR1 and PslTIR1 act as posi-tive regulators of auxin signaling in coordinating the developmentof leaves and fruit . Over-expression of SlTIR1 and PslTIR1in tomato resulted in parthenocarpic fruit formation and alteredleaf morphology. To gain further insight into SlTIR1 poten-tial functions that regulate gene expression and plant growth anddevelopment, the SlTIR1 promoter was amplified by PCR based onthe cDNA sequence and genomic database. A 2138-bp DNA frag-ment of the putative promoter region was isolated and fused to the-glucuronidase (GUS) reporter gene in the modified pCAMBIA1301binary vector. The recombinant pCAMBIA1301 vector wasstably introduced into tomato plants. The SlTIR1 promoter droveGUS expression predominantly in the leaf and vasculature in tomatoseedlings.