Cytokinin (zeatin + zeatin riboside) and indole-3-acetic acid (IAA) contents in the grains transiently increased at early filling stage and WS treatments hastened their declines at the late grain filling stage.
Gibberellins (GAs; GA1 + GA4) in the grains were also high at early grain filling but HN enhanced, whereas WS substantially reduced, its accumulation.