Journal Article

Influence of High CO<sub>2</sub>Partial Pressure on Nitrogen Use Efficiency of the C<sub>4</sub>Grasses <i>Panicum coloratum</i> and <i>Cenchrus ciliaris</i>

Silvia G. Rudmann, Paul J. Milham and Jann P. Conroy

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 88, issue 4, pages 571-577
Published in print October 2001 | ISSN: 0305-7364
Published online October 2001 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1006/anbo.2001.1503
Influence of High CO2Partial Pressure on Nitrogen Use Efficiency of the C4Grasses Panicum coloratum and Cenchrus ciliaris

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Australia's tropical grasslands are dominated by C4grasses, characterized by their unique biochemistry and anatomy. Two naturalized C4grasses (Panicum coloratum and Cenchrus ciliaris) were used to investigate whether high CO2partial pressure [ p(CO2)] influences photosynthetic nitrogen use efficiency and plant nitrogen use efficiency (PNUE and NUE respectively). Plants were grown for 30 d with four levels of N at p(CO2) of 38 or 86 Pa. PNUE was calculated from leaf CO2assimilation rates (A) and leaf N concentrations, and NUE from total leaf N content and plant dry mass. At each p(CO2), PNUE and NUE were greater for C. ciliaris than for P. coloratum due to higher A and dry mass combined with lower leaf N concentrations. Elevatedp (CO2) increased PNUE of C. ciliaris only. This effect was due to lower leaf N concentrations (area basis). At high p(CO2), NUE of C. ciliaris was also greater. This resulted from a 1.6-fold stimulation of dry mass by high p(CO2). Although dry mass of P. coloratum was increased 1.2-fold by elevated p(CO2), its NUE was unaffected. Leaf transpiration rates were halved at elevated p(CO2), and we suggest that this factor plays a major role in the growth response of C4grasses to high p(CO2). Copyright 2001 Annals of Botany Company

Keywords: Panicum coloratum, Cenchrus ciliaris, nitrogen use efficiency, elevated CO2, leaf N concentration, growth, photosynthesis

Journal Article.  10 words. 

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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