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Study on Difference and Primarily Mechanism of Nitrogen Use Efficiency (NUE) in Populus nigra Seedlings Genotypes

  • The variation in nitrogen utilization efficiency of 104 Populus nigra genotypes was studied by analyzing growth and physiological parameters under nitrogen fertilization or non-fertilization conditions. The results showed that the variation of nitrogen utilization efficiency among seedlings of varied Populus nigra genotypes were significant at different nitrogen supply. All seedlings with varied genotypes in this study were divided into four categories according to annual average individual volume increment in the two nitrogen treatments. These categories are high efficient in both nitrogen applications, efficient in high N application, efficient in low N application, and low efficient in both nitrogen applications. Eight genotypes were selected from each of the first two categories. These seedlings are high efficient to nitrogen utilization with excellent growth and productivities, therefore they are highly valuable for tree breeding. Comparison and analysis of the related parameters of nitrogen utilization efficiency showed that the the values of nitrogen response parameters including net photosynthetic rate, nitrate reductase activity, GS Activity, root dry weight, root volume and specific root area of seedlings within the first category were all higher than those within the second category, which reveal preliminarily the mechanism underlying nitrogen utilization of different Populus nigra genotypes.
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Study on Difference and Primarily Mechanism of Nitrogen Use Efficiency (NUE) in Populus nigra Seedlings Genotypes

  • 1. College of Forestry Resources and Environment, Nanjing Forestry University, Nanjing 210037, jiangsu, China
  • 2. Research Institute of Forestry,Chinese Academy of Forestry
  • 3.  Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China
  • 5. Department of Chemistry & Biology Engineering, Sanming University, Sanming 365004, Fujian, China)

Abstract: The variation in nitrogen utilization efficiency of 104 Populus nigra genotypes was studied by analyzing growth and physiological parameters under nitrogen fertilization or non-fertilization conditions. The results showed that the variation of nitrogen utilization efficiency among seedlings of varied Populus nigra genotypes were significant at different nitrogen supply. All seedlings with varied genotypes in this study were divided into four categories according to annual average individual volume increment in the two nitrogen treatments. These categories are high efficient in both nitrogen applications, efficient in high N application, efficient in low N application, and low efficient in both nitrogen applications. Eight genotypes were selected from each of the first two categories. These seedlings are high efficient to nitrogen utilization with excellent growth and productivities, therefore they are highly valuable for tree breeding. Comparison and analysis of the related parameters of nitrogen utilization efficiency showed that the the values of nitrogen response parameters including net photosynthetic rate, nitrate reductase activity, GS Activity, root dry weight, root volume and specific root area of seedlings within the first category were all higher than those within the second category, which reveal preliminarily the mechanism underlying nitrogen utilization of different Populus nigra genotypes.

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