Figure 4.

Luminescence intensity of plants treated with ABA, NaCl, or ABA plus NaCl at different temperatures. Plants were placed on filter paper soaked with either MS salt solution (ABA) or 300 mm NaCl in MS solution (NaCl or ABA + NaCl). ABA (100 μm) was sprayed directly on plants. The treatments lasted for 4 h before luciferase imaging. For the 0°C treatments plants were incubated at 0°C for 44 h before being transferred to filter paper for NaCl and/or ABA treatments at 0°C for 4 h. White bars, ABA treatment; hatched bars, NaCl treatment; and black bars, combined NaCl and ABA treatment. Error bars represent ±sd (n = 15).