Fig. 6: Effects of GR24^5DS on heat and cold tolerance in wild-type (WT; Ailsa Craig) and ABA-deficient mutant not plants.

a, c Changes in the actual quantum efficiency of PSII photochemistry (Ф_PSII) in leaves with or without GR24^5DS application after 48 h of heat stress at 42 °C (a) or 7 d of cold stress at 4 °C (c). The color scale below the image ranges from 0 to 1.0 (purple). b, d Relative electrolyte leakage (REL) in leaves with or without GR24^5DS application after 48 h of heat at 42 °C (b) or 7 d of cold at 4 °C (d). The GR24^5DS (3 µM, 15 mL) solution was applied to the roots of each plant 24 h before stress. The results in (b) and (d) are mean ± SD of three biological replicates; for (a) and (c), 15 leaves were used, and the plus and minus marks represent the application of GR24^5DS and water solution, respectively. Significant differences are indicated by different letters (P < 0.05, Tukey’s test)