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
Identifieur interne : 00AB27 ( Main/Exploration ); précédent : 00AB26; suivant : 00AB28Proton release by roots of Medicago murex and Medicago sativa growing in acidic conditions, and implications for rhizosphere pH changes and nodulation at low pH
Auteurs : Y. Cheng [France, Australie] ; J. G. Howieson [Australie] ; G. W. O'Hara [Australie] ; E. L. J. Watkin [Australie] ; G. Souche [France] ; B. Jaillard [France] ; P. Hinsinger [France]Source :
- Soil biology & biochemistry [ 0038-0717 ] ; 2004.
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- Pascal (Inist)
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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 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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Watkin</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Division of Science and Engineering, Centre for Rhizobium Studies, Murdoch University, South Street, Murdoch Drive</s1><s2>Murdoch WA 6150</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Murdoch WA 6150</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>School of Biomedical Sciences, Curtin University of Technology, G.P.O. Box U1987</s1><s2>Perth, WA 6845</s2><s3>AUS</s3><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Perth, WA 6845</wicri:noRegion></affiliation></author><author><name sortKey="Souche, G" sort="Souche, G" uniqKey="Souche G" first="G." last="Souche">G. Souche</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>INRA UMR Rhizosphère et Symbiose, Place Viala</s1><s2>34060 Montpellier</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>34060 Montpellier</wicri:noRegion><placeName><settlement type="city">Montpellier</settlement><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Languedoc-Roussillon</region></placeName></affiliation></author><author><name sortKey="Jaillard, B" sort="Jaillard, B" uniqKey="Jaillard B" first="B." last="Jaillard">B. Jaillard</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>INRA UMR Rhizosphère et Symbiose, Place Viala</s1><s2>34060 Montpellier</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>34060 Montpellier</wicri:noRegion><placeName><settlement type="city">Montpellier</settlement><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Languedoc-Roussillon</region></placeName></affiliation></author><author><name sortKey="Hinsinger, P" sort="Hinsinger, P" uniqKey="Hinsinger P" first="P." last="Hinsinger">P. Hinsinger</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>INRA UMR Rhizosphère et Symbiose, Place Viala</s1><s2>34060 Montpellier</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>34060 Montpellier</wicri:noRegion><placeName><settlement type="city">Montpellier</settlement><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Languedoc-Roussillon</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Soil biology & biochemistry</title><title level="j" type="abbreviated">Soil biol. biochem.</title><idno type="ISSN">0038-0717</idno><imprint><date when="2004">2004</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Soil biology & biochemistry</title><title level="j" type="abbreviated">Soil biol. biochem.</title><idno type="ISSN">0038-0717</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acidity</term><term>Medicago sativa</term><term>Nodulation</term><term>Proton transfer</term><term>Rhizosphere</term><term>Soil science</term><term>pH</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Transfert proton</term><term>Acidité</term><term>pH</term><term>Nodulation</term><term>Science du sol</term><term>Medicago sativa</term><term>Rhizosphère</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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<sup>+</sup> 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<sup>-</sup> 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.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Languedoc-Roussillon</li><li>Occitanie (région administrative)</li></region><settlement><li>Montpellier</li></settlement></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Cheng, Y" sort="Cheng, Y" uniqKey="Cheng Y" first="Y." last="Cheng">Y. Cheng</name></region><name sortKey="Hinsinger, P" sort="Hinsinger, P" uniqKey="Hinsinger P" first="P." last="Hinsinger">P. Hinsinger</name><name sortKey="Jaillard, B" sort="Jaillard, B" uniqKey="Jaillard B" first="B." last="Jaillard">B. Jaillard</name><name sortKey="Souche, G" sort="Souche, G" uniqKey="Souche G" first="G." last="Souche">G. Souche</name></country><country name="Australie"><noRegion><name sortKey="Cheng, Y" sort="Cheng, Y" uniqKey="Cheng Y" first="Y." last="Cheng">Y. Cheng</name></noRegion><name sortKey="Howieson, J G" sort="Howieson, J G" uniqKey="Howieson J" first="J. G." last="Howieson">J. G. Howieson</name><name sortKey="O Hara, G W" sort="O Hara, G W" uniqKey="O Hara G" first="G. W." last="O'Hara">G. W. O'Hara</name><name sortKey="Watkin, E L J" sort="Watkin, E L J" uniqKey="Watkin E" first="E. L. J." last="Watkin">E. L. J. Watkin</name><name sortKey="Watkin, E L J" sort="Watkin, E L J" uniqKey="Watkin E" first="E. L. J." last="Watkin">E. L. J. Watkin</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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