This document summarizes an experiment studying the effects of genetically engineering tobacco plants to overproduce citric acid. The study found that transgenic tobacco lines that expressed the citrate synthase gene produced more citric acid and had enhanced growth and productivity compared to control plants when grown in low-phosphorus soil conditions. Specifically, the citrate-overproducing plants were taller, had larger leaves, and produced more shoot and capsule biomass than controls in soils with limited phosphorus availability. Biochemical analysis also showed the transgenic lines accumulated more phosphorus in their leaves. These results suggest citric acid overexpression enables plants to better utilize insoluble sources of phosphorus in the soil.