Figure 2.

Leaf concentrations of proline (A), glycine betaine (B), and total phenolics (C) in sweet basil (Ocimum basilicum) after foliar application of 30 mM trehalose (Tre) and/or 1 mM salicylic acid (SA) during drought stress. One month old seedlings were watered to 100% (control) or 60% (drought) field capacity for 20 days. Tre and/or SA were then applied twice with a 5 day interval. The watering conditions were maintained for an additional 2 weeks until plants were harvested. Data are the means ± SE (n = 6). Different letters above the bars indicate significant differences according to Duncan’s multiple-range test at the p < 0.01 level.