The temperature of newly opened buds (blue diamonds) and adjacent leaves (red squares) compared with ambient temperature (green line) from 1 (DAT1) to 7 days (DAT7) after exposure to drought, heat, and combined heat and drought treatments relative to the control. Data are means of the 12 genotypes. The fitted linear regressions are shown, with significance of the slope parameter for DAT: (a) Control: Tbud = 18.37 + 0.09DAT; p = 0.174; Tleaf = 16.82 - 0.02DAT, p = 0.861. (b) Drought: Tbud = 18.41 + 0.19DAT, p = 0.023; Tleaf = 15.78 + 0.47DAT, p < 0.001. (c) Heat: Tbud = 28.82 - 0.03DAT, p = 0.174; Tleaf = 24.35 + 0.27DAT, p = 0.086. (d) Combined: Tbud = 28.29 + 0.63DAT, p < 0.001; Tleaf = 24.09 + 0.91DAT, p < 0.001.