Influence of STS and ethephon (eth) on stomatal conductance (A), xylem sap ABA concentration (B), and ethylene evolution (C) from leaf tissue in wild-type (cv Ailsa Craig) and transgenic (ACO1AS) genotypes of tomato grown in 1.1/1.5-g cm−3 split-pot soil columns. Double (A and B) or single ses (C) are shown. FW, Fresh weight. A and B, ♦, Split-pot; ▪, STS; ▴, ethephon. C, Black bars, Split-pot; white bars, STS; hatched bars, etephon.