Source‐sink limitations for grain weight in wheat and barley under waterlogging conditions during pre‐anthesis

Abstract In wheat and barley, grain yield is strongly affected by waterlogging, especially during the period immediately previous to anthesis. Although waterlogging reduces mainly reductions in number, mean weight (MGW) also frequently reduced. The aim of this work was determine whether increases source‐sink ratio produces smaller MGW due barley. Two experiments were carried out combining a condition 20 days pre‐anthesis, two soil N conditions at sowing manipulations grain‐filling (untrimmed or 50% trimmed spikes). Waterlogging reduced both species up 35% 44% negative effect on intensified with warmer temperatures higher atmospheric demand. Increases (by trimming treatments) showed positive impact (up 40%) barley 20%) under conditions. For species, response lower and/or spike hierarchies (i.e. spikes from tillers). Our results that pre‐anthesis through reduction source possible potential weight, depending intensity stress.