GUS histochemical assays and GUS activity in different tissues of OrGSEp-374 transgenic rice. (a) GUS histochemical assays of OrGSEp-374 transgenic rice. A. Root, B. stem, C. leaf, D. ligule, E. spikelet, F. anther, G. seed. H. endosperm. Bar = 1000 μm; (b) GUS activity in different tissues of transgenic rice carrying the OrGSEp-374 construct. Boxplots show GUS activity in different tissues of transgenic rice. The lower boundary of each box denotes the 25th percentile, the upper boundary of each box denotes the 75th percentile, and the solid line in the middle of each box denotes the 50th percentile. The two ends of the error bars denote the maximum and minimum values.