Leaf photosynthetic characteristics of seedlings of actinorhizal Alnus spp. and Elaeagnus spp. |
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Authors: | Benoît Côté Roger William Carlson Jeffrey Owen Dawson |
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Institution: | (1) Department of Forestry, University of Illinois, 110 Mumford Hall, 1301 West Gregory Drive, 61801 Urbana, IL, USA;(2) Department of Environmental Studies, University of Illinois, 408 South Goodwin Ave., 61801 Urbana, IL, USA |
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Abstract: | Single leaf photosynthetic characteristics of Alnus glutinosa, A. incana, A. rubra, Elaeagnus angustifolia, and E. umbellata seedlings conditioned to ambient sunlight in a glasshouse were assessed. Light saturation occurred between 930 and 1400 mol m-2s-1 PAR for all species. Maximum rates of net photosynthesis (Pn) measured at 25°C ranged from 12.8 to 17.3 mol CO2m-2s-1 and rates of dark respiration ranged from 0.74 to 0.95 mol CO2m-2s-1. These values of leaf photosynthetic variables are typical of early to midsuccessional species. The rate of Pn measured at optimal temperature (20°C) and 530 mol m-2s-1 PAR was significantly (p<0.01) correlated with leaf nitrogen concentration (r=0.69) and negatively correlated with the mean area of a leaf (r=–0.64). We suggest that the high leaf nitrogen concentration and rate of Pn observed for Elaeagnus umbellata and to a lesser degree for E. angustifolia are genetic adaptations related to their crown architecture.Abbreviations Pn
net photosynthesis |
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Keywords: | CO2 fixation early successional plant leaf N plant architecture |
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