Drought survival analysis of ZAT10 transgenic plants. Application of the threshold test. The Fv/Fm measurements of individual (a) Columbia (◇), zat10(i)-1 (□) and zat10(i)-3 (○), and (b) 35S:ZAT10-6 (□) and 35S:ZAT10-14 (○) specimens are shown. Filled symbols represent controls; empty symbols represent plants that failed to evidence signs of recovery within 3 days of rehydration. The 33% threshold for a typical average control Fv/Fm of 0.800 is shown as a dotted line. For control populations, n = 2 for each line; for drought-treated populations, n = 13 for each line.