The effect of nitrogen fertilizers on protein accumulation in wheat (Triticum aestivum L.)
1990
Stenram, U. | Heneen, W.K. (Sveriges Lantbruksuniv., Uppsala (Sweden). Inst. foer Vaextfoeraedling) | Olered, R.
Protein analysis were carried out on developing and mature wheat grains of winter and spring cultivars grown under different fertilization conditions (0-210 kg nitrogen/ha). The nitrogen was applied as nitrate of lime, which was complemented with urea in one treatment. The grain proteins were fractioned into albumins, globulins, gliadins and glutenins. In winter wheat, the crude protein content increased when more nitrogen was applied. However, it was at nitrogen inputs of 140 and 180 kg/ha that maximum grain yields were obtained. At higher nitrogen fertilization levels, there was a negative correlation between grain yield and protein content. In response to the increase in the nitrogen fertilization level, the ratio between gliadins and glutenins increased in three cultivars out of four, not only because of gliadin increase but also because of glutenin decrease. During grain development of both winter and spring cultivars, the gliadin content increased, the albumin content decreased, whereas the globulin and the glutenin contents remained almost constant. The gliadins increased more rapidly when the crop was supplied with high amount of nitrogen fertilizer
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