Skip Navigation



JXB Advance Access published online on April 25, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri166
This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow All Versions of this Article:
56/417/1779    most recent
eri166v1
Right arrow E-letters: Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when E-letters are posted
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 PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Disclaimer
Google Scholar
Right arrow Articles by Schulze, J.
Right arrow Articles by Drevon, J.-J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Schulze, J.
Right arrow Articles by Drevon, J.-J.
Agricola
Right arrow Articles by Schulze, J.
Right arrow Articles by Drevon, J.-J.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received October 22, 2004
Accepted March 16, 2005

RESEARCH PAPER

P-deficiency increases the O2 uptake per N2 reduced in alfalfa

Joachim Schulze 1* and Jean-Jacques Drevon 2

1 Institut für Agrikulturchemie der Georg-August-Universität Göttingen, Carl-Sprengel-Weg 1, D-37075 Göttingen, Germany
2 INRA-ENSAM Sols Symbioses Environnement, Place Viala 1, F-34060 Montpellier cedex, France

* To whom correspondence should be addressed.
Joachim Schulze, E-mail: jschulz2{at}gwdg.de


  Abstract

Nodulated alfalfa (Medicago sativa L. cv. Saranac) plants were grown in hydroponics at P-sufficient and P-deficient supply levels. After 5 weeks of growth, dry matter accumulation, nodulation, total N and P accumulation, as well as 15N2 uptake, were measured. Moreover, the response of nodule O2-uptake to raising external pO2 was determined in an open-flow measurement system and nodule permeability was calculated. Plants in the P-deficient supply treatment had a lower P concentration in all organs. In both treatments the highest P concentration was found in nodules. In the P-deficient supply treatment plants formed less dry matter, had a lower shoot/root ratio, less nodulation, decreased total N accumulation, and lower 15N2 uptake per dry matter nodule. Nodules in the P-deficient treatment were, on average, smaller and had a higher O2 uptake per N2 reduced, coinciding with increased nodule permeability and conductance. Thus increased oxygen uptake appears to be a mechanism to adjust nodule metabolism to P deficiency in indeterminate N2-fixing nodules such as in alfalfa, as has previously been shown for determinate nodule forms.

Keywords: Alfalfa; nitrogen fixation; nodule conductance; oxygen diffusion; phosphorus; respiration; rhizobia; symbiosis.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Plant Physiol.Home page
G. Hernandez, O. Valdes-Lopez, M. Ramirez, N. Goffard, G. Weiller, R. Aparicio-Fabre, S. I. Fuentes, A. Erban, J. Kopka, M. K. Udvardi, et al.
Global Changes in the Transcript and Metabolic Profiles during Symbiotic Nitrogen Fixation in Phosphorus-Stressed Common Bean Plants
Plant Physiology, November 1, 2009; 151(3): 1221 - 1238.
[Abstract] [Full Text] [PDF]

Home page
 J Exp BotHome page
S. A. Fischinger, M. Hristozkova, Z.-A. Mainassara, and J. Schulze
Elevated CO2 concentration around alfalfa nodules increases N2 fixation
J. Exp. Bot., October 8, 2009; (2009) erp287v1.
[Abstract] [Full Text] [PDF]

Home page
 ANN BOT (LOND)Home page
J. SCHULZE, G. TEMPLE, S. J. TEMPLE, H. BESCHOW, and C. P. VANCE
Nitrogen Fixation by White Lupin under Phosphorus Deficiency
Ann. Bot., October 1, 2006; 98(4): 731 - 740.
[Abstract] [Full Text] [PDF]


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.