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首页> 外文期刊>Journal of plant nutrition and soil science >Splitting nitrogen applications improves wheat storage protein composition under low N supply
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Splitting nitrogen applications improves wheat storage protein composition under low N supply

机译：分裂氮应用在低N供应下改善了小麦储存蛋白质组合物

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摘要

For the baking quality of wheat flours, the composition and concentration of grain protein are crucial. It is common practice to use late nitrogen (N) application to increase grain protein concentration (GPC) and hence, improve baking quality. However, the use of N fertilizer-particularly shortly before harvest-involves environmental risks. With the suitability of GPC as a parameter for baking quality predictions being more and more questioned, there are further investigations needed considering not only the GPC but also the composition of grain protein. Gluten protein composition varies depending on genotype and environmental factors, such as weather conditions and fertilization rate. To examine whether the effect of a split N application varies under different amounts of total N supply, this study investigates the effects of split nitrogen application on grain protein concentration and composition of wheat (Triticum aestivum L. cv. JB Asano) at four different N fertilization levels (0.8; 1.0; 1.2, and 1.4 g N pot(-1)) in a pot experiment. The GPC was affected by both, N fertilization level and split N application. In this experiment, the minimum GPC of 13%, which is required for class A wheat varieties, was only achieved when N supply was moderate (at least 1.2 g N per pot). Considering the storage protein composition, the split N application influenced the proportion of alpha-/beta-gliadins and gamma-gliadins, the alterations being inconsistent. The ratio of high molecular weight (HMW) to low molecular weight (LMW) glutenin subunits was increased by the split N application only at the lowest N fertilization level. It is concluded that splitting N fertilization into three doses and hence applying one dose of N late in the season can still be a useful approach to improve GPC as well as protein composition - especially when the total N supply is low.
机译：对于小麦粉的烘焙质量，谷物蛋白的组成和浓度至关重要。常常使用晚期氮（N）施用来增加谷物蛋白浓度（GPC），从而提高烘焙质量。然而，在收获之前使用N肥料 - 特别是在收获之前涉及环境风险。随着GPC的适用性作为烘焙质量预测的参数越来越受到质疑，还需要进一步的研究，不仅需要考虑GPC，还需要进行谷物蛋白的组成。麸质蛋白质组成根据基因型和环境因素而变化，例如天气条件和施肥率。为了检查分裂N申请的效果是否在不同的N个供应量下变化，本研究调查了分裂氮适用于四种不同N的粒蛋白浓度和小麦组成的谷物蛋白质浓度和组成的影响施肥水平（0.8; 1.0; 1.2，1.2，1.4克（-1））在罐实验中。 GPC受施肥水平和分裂N施用的影响。在该实验中，仅在N供应中等时（每罐至少1.2g N），才能实现13％的最低GPC。考虑到储存蛋白质组合物，分裂N申请影响了α-/β-胶质蛋白和γ-胶质蛋白的比例，改变不一致。仅在最低N施肥水平下，分裂N施用增加了高分子量（HMW）至低分子量（LMW）谷蛋白亚基的比例。结论是，将N施肥分成三个剂量，因此将一剂N晚期施用仍然是改善GPC以及蛋白质组合物的有用方法 - 特别是当总N供电低时。

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