硫对不同类型春小麦湿面筋和沉降值及氨基酸的效应

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

以 6个不同品质类型春小麦为材料 ,在不同氮水平下 ,研究施硫对湿面筋、沉降值及氨基酸的调节效应。结果表明 ,高氮条件下 (施尿素 12 8kg/hm2 ) ,施硫可提高湿面筋含量和沉降值 ,对高蛋白品种作用更明显。低氮 (施尿素 6 0kg/hm2 )条件下施硫 ,除辽 10的湿面筋和沉降值均降低外 ,其他品种表现湿面筋含量降低而沉降值提高。高蛋白品种在氮供应较充足条件下 ,硫才能发挥改善各项品质指标的作用 ,否则 ,氮将成为硫发挥作用的限制因素。氮施用水平较高时 ,硫可提高不同品种的总氨基酸和含硫氨基酸含量 ,且含硫氨基酸与湿面筋和沉降值呈正相关。

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.