Leaf nitrogen content and carbon di oxide assimilation capacity in peach prunus persica cultivar golden glory

Dejong, J.M.

Journal of the American Society for Horticultural Science 107(6): 955-959

1982


ISSN/ISBN: 0003-1062
Accession: 005799295

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Abstract
Differences in the photosynthetic capacity of leaves of peach [P. persica (L.) Batsch cv. Golden Glory] were investigated in conjunction with their leaf N and P content. Photosynthetic CO2 assimilation expressed on a leaf area basis, mesophyll conductance, and leaf conductance to water vapor were all linearly related to leaf N content expressed on a leaf area basis (R2 = 0.908, 0.921, 0.685, respectively). Leaf intercellular CO2 concentrations tended to decrease slightly with increasing CO2 assimilation rates and leaf N contents, indicating that CO2 assimilation was not being restricted by low intercellular CO2 concentrations and leaf conductances in leaves with lower assimilation capacity. CO2 assimilation, mesophyll conductance, and leaf conductance to water vapor were also linearly related to leaf P content, but these relationships were not as clear as for leaf N content. (R2 = 0.601, 0.687, 0.324, respectively). The maximum CO2 assimilation rate per unit of leaf N for peach leaves in this experiment was 6.0-7.0 nmol CO2 mg N-1 s-1.