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    Proton release by toods of Medicago murex and Medicago sativa growing in acid conditions, and implications for rizosphere pH changes and nodulation at low pH

    Access Status
    Fulltext not available
    Authors
    Cheng, Y. W.
    Howieson, J.
    O'Hara, G.
    Watkin, Elizabeth
    Date
    2004
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Cheng, Yuk Wing and Howieson, J. and O'Hara, G. and Watkin, Elizabeth. 2004. Proton release by toods of Medicago murex and Medicago sativa growing in acid conditions, and implications for rizosphere pH changes and nodulation at low pH. Soil Biology and Biochemistry. 36 (8): pp. 1357-1365.
    Source Title
    Soil Biology and Biochemistry
    DOI
    10.1016/j.soilbio.2004.04.017
    ISSN
    00380717
    Faculty
    Department of Mathematics and Statistics
    School of Science
    Faculty of Science and Engineering
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/332/description#description

    Copyright © 2004 Elsevier Ltd. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/29115
    Collection
    • Curtin Research Publications
    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 4 d, 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.

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