FIGURE 1.

Drought phases in the United Kingdom (UK) and Iran (IR) wheat cultivars in well‐watered condition (WW) and in drought stress (DS) in the greenhouse experiment. “Time (days)” refers to the duration of drought treatment (day 0 denotes the last day of watering for treated plants). (a) Soil water content. (b) Transpiration rate. (c) Non‐photochemical quenching in relation to sunlight photosynthetically active radiation (PAR) reaching the leaf (see Figure S1 for more information). (d) Sunlight‐induced photodamage monitored by Fv/Fm parameter, and the outdoor sunlight intensity preceding the Fv/Fm measurement. (e‐g) Maturity data on the day of harvest. (e) Shoot biomass per plant. (f) Grain number per plant. (g) Total grain weight per plant. Data are means ± SD (n = 4). Asterisks indicate the p‐values of the control versus drought comparison (.01 < p < .05 is marked by *, .001 < p ≤ .01 by **, p < .001 by ***), estimated by Analysis of variance (except in c, estimated by ANCOVA)