Clone-Specific Response in Leaf Nitrate Reductase Activity among Unrelated Hybrid Poplars in relation to Soil Nitrate Availability

<table>Effect of leaf age (developmental stage) on nitrate reductase activity (NRA) of five hybrid poplar clones. Leaf plastochron index (LPI) is used as an indicator of leaf age. All data points are means of duplicate sample analyses and vertical bars represent SD of the means.  </table>

International Journal of Forestry Research

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Figure 3

Figure 3: Clone-Specific Response in Leaf Nitrate Reductase Activity among Unrelated Hybrid Poplars in relation to Soil Nitrate Availability 