Effects of Sulphur on Wet Gluten, SDS-Sedimentation Value and Amino Acid in Spring Wheat Cultivars with Different Quality

The effects of nitrogen and sulphur on wet gluten and SDS-sedimentation value and amino acid were studied by using six cultivars with different quality. Under high nitrogen application (urea 128 kg/hm2), the wet gluten and SDS-sedimentation value could be increased by sulphur application, especially for the cultivars with high grain protein content. In lower nitrogen treatment (urea 60 kg/hm2), the wet gluten content was decreased by sulphur application, but increased in SDS-sedimentation value except Liao10. It suggested that nitrogen level would be a factor of sulphur effect on grain quality. The total contents of amino acid and sulphur-amino acid in grain were increased by sulphur application under the condition of high nitrogen level, and the positive correlation between sulphur-amino acid and wet gluten and SDS-sedimentation value were found. Thus the grain quality could be improved.