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ZHANG Yun, CUI Xiao-yang. Nitrogen absorption and assimilation characteristics of Pinus koraiensis seedings in different NH+4/NO-3 ratios[J]. Journal of Beijing Forestry University, 2011, 33(5): 61-64.
Citation: ZHANG Yun, CUI Xiao-yang. Nitrogen absorption and assimilation characteristics of Pinus koraiensis seedings in different NH+4/NO-3 ratios[J]. Journal of Beijing Forestry University, 2011, 33(5): 61-64.
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Nitrogen absorption and assimilation characteristics of Pinus koraiensis seedings in different NH+4/NO-3 ratios

  • College of Forestry, Northeast Forestry University, Harbin,150040, P. R.China.

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  • Received Date: December 31, 1899
  • Revised Date: December 31, 1899
  • Published Date: September 29, 2011
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  • A solution cultivation experiment with Pinus koraiensis seedlings was conducted to study the effect of different NH+4/NO-3 ratio on nitrogen absorption，nitrogen assimilation enzyme and growth. The results showed that more nitrogen was absorbed by the seedlings in high NH+4/NO-3 ratio solution, whose total biomass was more than the others. Nitrate reductase (NR) activity was higher in the roots than the leaves, NO-3 promoted NR activity, which responsed to increased NO-3 availability of the solution. Glutamine synthetase (GS) activity and glutamate dehydrogenase (GDH) activity was improved by the induction of exogenous NH+4. GS activity was higher in the leaves than the roots, and which was higher in the seedlings of high NH+4/NO-3 ratio solution. GDH activity of the roots and the leaves was high, and which was higher in the seedlings of high NH+4/NO-3 ratio solution.
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