Proton release by roots of Medicago murex and Medicago sativa growing in acidic conditions, and implications for rhizosphere pH changes and nodulation at low pH

Y. Cheng; J.G. Howieson; G.W. O'Hara; E.L.J. Watkin; G. Souche; B. Jaillard; P. Hinsinger

doi:10.1016/j.soilbio.2004.04.017

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Proton release by roots of Medicago murex and Medicago sativa growing in acidic conditions, and implications for rhizosphere pH changes and nodulation at low pH

Journal article

Peer reviewed

Proton release by roots of Medicago murex and Medicago sativa growing in acidic conditions, and implications for rhizosphere pH changes and nodulation at low pH

Y. Cheng, J.G. Howieson, G.W. O'Hara, E.L.J. Watkin, G. Souche, B. Jaillard and P. Hinsinger

Soil Biology and Biochemistry, Vol.36(8), pp.1357-1365

2004

DOI: https://doi.org/10.1016/j.soilbio.2004.04.017

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Abstract

Medicago murex nodulates faster and produces more nodules than Medicago sativa in acidic sandy soils. Experiments using a 'root mat' approach and videodensitometry examined pH changes in the rhizospheres of nitrate-fed plants of M. murex and M. sativa. Using the 'root mat' approach with soil disks of pH 4.49, M. sativa cv. Aquarius acidified its rhizosphere by approximately 0.2-0.4 pH-units within 4d, while M. murex cv. Zodiac did not acidify its rhizosphere. Rates of H + release were higher from M. sativa than from M. murex. Videodensitometry of roots embedded in agarose of pH 4.5 showed that the mature parts of the tap-root of both species exuded OH - ions, but was approximately twofold more in M. murex than in M. sativa. Consequently, young parts of the M. sativa rhizosphere were less alkaline than that of M. murex. It is suggested that the difference in nodulation response between the two species at low pH may be related to the different patterns of rhizosphere acidification: the stronger rhizosphere acidification of M. sativa being less favourable for survival and growth of Sinorhizobium medicae. The higher rate of rhizosphere acidification by M. sativa roots may be related to its genetic characteristics including greater relative root growth rate and greater sensitivity to acidity in comparison to M. murex.

Details

Title: Proton release by roots of Medicago murex and Medicago sativa growing in acidic conditions, and implications for rhizosphere pH changes and nodulation at low pH
Authors/Creators: Y. Cheng (Author/Creator) - Murdoch University
J.G. Howieson (Author/Creator) - Murdoch University
G.W. O'Hara (Author/Creator)
E.L.J. Watkin (Author/Creator)
G. Souche (Author/Creator) - Institut National de la Recherche Agronomique
B. Jaillard (Author/Creator) - Institut National de la Recherche Agronomique
P. Hinsinger (Author/Creator) - Institut National de la Recherche Agronomique
Publication Details: Soil Biology and Biochemistry, Vol.36(8), pp.1357-1365
Publisher: Elsevier BV
Identifiers: 991005542662607891
Copyright: © 2004 Published by Elsevier Ltd.
Murdoch Affiliation: Centre for Rhizobium Studies
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.45 Soil Science; 3.45.473 Soil Phosphorus Dynamics
Web Of Science research areas: Soil Science
ESI research areas: Agricultural Sciences