Genotypic difference in growth inhibition and yield loss of barley under waterlogging stress
湿害胁迫下大麦生长抑制和产量损失的基因型差异

Fifteen barley genotypes were exposed to waterlogging stress for 12 d at tillering stage to investigate the genotypic difference in growth inhibition and yield loss.The results showed that leaf chlorosis index(LCI)is not a reasonable indicator for identifying all barley genotypes in their waterlogging tolerance,but it is suitable for most genotypes.Length and width of new leaves initiated after waterlogging reduced for all genotypes except 93-3143,which remained little change under waterlogging condition.In comparison to control,waterlogging caused reduction in plant height and dry weigh by 29.2% and 54.4%,respectively.There was a significant difference in reduction extent among the genotypes,with Franklin being the most reduced.Grain yield was significantly reduced under waterlogging condition,with spike number being most affected among yield components.The reduction in spike number is mainly attributed to few tillers and low effective tillers per plant.The significant differences were detected among the genotypes in their response of yield formation to waterlogging,and local race Yongjiahong Liuleng showed least yield loss,while the two Australian barley varieties had the greatest loss.Path analysis showed that the effect of spike number on yield via grain was quite small,and via grain weight was large and positive;effect of grains per spike on yield via spike number is also small and via grain weight was large and negative;effect of grain weight on yield via both spike number and grains per spike was large,but with different direction.