Influence of late nitrogen application on nitrogen translocation and protein fractions of wheat genotypes differing in protein content

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To investigate the influence of late nitrogen application on nitrogen translocation and protein fractions, three wheat genotypes differing in protein content were studied in pot experiments at low and high fertility regimes with late foliar nitrogen application. At high fertility, late nitrogen application increased N translocation and improved N translocation efficiency greatly, however, cultivar differences were found at low fertility. Late nitrogen application increased both leaf and chaff N translocation, and increased culm N translocation only at high fertility. Relative contributions of vegetative components to N translocation efficiency were altered by late nitrogen application. Albumins and gliadins contents at maturity were also observed. Xin Kehan No. 9, the high yielding, low grain protein content cultivar showed no change in glutenins content resulting from late nitrogen application. Glutenin content of Dongnong 7742, the high yielding, high grain protein content, decreased slightly, and Robin, high grain protein but low yielding cultivar decreased only at high fertility. Residual protein contents were significantly increased by late nitrogen application for all cultivars. It was concluded that nitrogen applied at later stage could be used efficiently only at high fertility, and most of the N translocated were used for the synthesis of residual proteins.