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JXB Advance Access originally published online on April 25, 2005
Journal of Experimental Botany 2005 56(417):1779-1784; doi:10.1093/jxb/eri166
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© 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

RESEARCH PAPER

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

Joachim Schulze1,* and Jean-Jacques Drevon2

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

* To whom correspondence should be addressed. Fax: +49 551 39 55 70. E-mail: jschulz2{at}gwdg.de

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.

Key words: Alfalfa, nitrogen fixation, nodule conductance, oxygen diffusion, phosphorus, respiration, rhizobia, symbiosis


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