Four winter wheat (Triticum aestivum L.) genotypes differing in grain protein contents were used in pot culture experiment in greenhouse to investigate the effects of post-anthesis drought (SRWC=45%~50%)

waterlogging and moderate soil water status (SRWC=75%~80%) on protein and starch contents in wheat grains. Grain protein content

glutenin content

the ratio of Glu/Gli

dry gluten and wet gluten content increased significantly under drought. Glutenin content and the ratio of Glu/Gli decreased significantly under waterlogging. Under both drought and waterlogging

grain starch yields decreased significantly

and amylose contents increased with decreasing amylpectin contents

consequently led to decreasing ratios of amylose/amylpectin. Drought and waterlogging had differential effects on grain gluten index

sedimentation volume and falling number in accordance with different varieties. Compared with CK

correlation coefficients among grain quality characters in different wheat varieties under drought and waterlogging were lower

indicating that the differences in grain quality characters under drought

waterlogging and moderate soil water status were distinct. These would have impacts on grain quality and utilization values of specialty wheats.