Skip Navigation

This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (4)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Rudmann, S. G.
Right arrow Articles by Conroy, J. P.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Rudmann, S. G.
Right arrow Articles by Conroy, J. P.
Agricola
Right arrow Articles by Rudmann, S. G.
Right arrow Articles by Conroy, J. P.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Annals of Botany 88: 571-577, 2001
© 2001 Annals of Botany Company

Influence of High CO2Partial Pressure on Nitrogen Use Efficiency of the C4Grasses Panicum coloratum and Cenchrus ciliaris

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

Centre for Horticulture and Plant Sciences, University of Western Sydney, Hawkesbury Campus, Locked Bag 1797, South Penrith Distribution Centre, NSW, 1797, Australia NSW Agriculture, Agriculture Institute, Forest Rd. Orange, NSW, 2800, Australia

Received: 16 March 2001 ; Returned for revision: 15 May 2001 . Accepted: 15 June 2001

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

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


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.