Systematic determination of the reproductive growth stage most sensitive to high night temperature stress in rice ( Oryza sativa )

High night‐temperature (HNT) stress during the reproductive stage of rice ( Oryza sativa L.) reduces spikelet fertility and yield by inhibiting important physiological processes. However, specifics such as the period of time that is most sensitive to HNT, is unknown. To investigate this, we conducted four controlled‐environment experiments with two rice cultivars, N22 (HNT tolerant) and WAB56–104 (HNT susceptible). These cultivars were exposed...