FIGURE 2.

Changes in daily minimum and maximum temperatures for the crop canopy from sowing to maturity, the mean air temperature of the wheat canopy in the high-temperature treatments and normal temperature control during the 2015–2016 (A–E) and 2016–2017 (F–J) wheat-growing seasons. P_S, P_B, and P_A refer to 5 days of heat priming at the stem-elongation, booting and anthesis stages, respectively. NN refers to no heat priming + no heat stress at the grain-filling stage (control). NH refers to no heat priming + heat stress at the grain-filling stage. ΔT refers to the increase in mean temperature between the treatment and control (average of the two wheat cultivars). Mean temperature represents the mean of all temperature data collected at 10-min intervals during the treatments.