Effects of temporary applications of nitrogen and cytokinins on the development of flag leaf and grain growth in wheat [Triticum]
1981
Herzog, H. (Kiel Univ. (Germany, F.R.). Inst. fuer Pflanzenbau und Pflanzenzuechtung)
In the flag leaf in two spring wheats grown in hydroculture under nutritional conditions that were nearly optimal for the overall development, additional early N-supply raised maximum chlorophyll content only slightly, but late applications strongly delayed pigment destruction and loss of green area. Corresponding treatments with cytokinin (Cy) were effective in the same way, but to a lesser degree. The higher efficiency of late application of N or Cy indicated their limiting function during senescence. Early treatments which increased number of kernels in parts of the ears showed that endogenous N- or Cy-levels were not sufficient for grain setting. Grown growth was stimulated only by early Cy-applications in experiment 2 in which Cy had no effect on kernel number, whereas late treatments were generally ineffective. Different N-levels in plants obviously did not limit growth, but high ones favoured tillering which presumably prevented increase of yield.
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