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
| Autor: | Philippe Hinsinger, Y. Cheng, John Howieson, Elizabeth Watkin, Graham O’Hara, Benoît Jaillard, Gérard Souche |
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| Přispěvatelé: | UMR INRA / ENSAM : Rhizosphère et Symbiose (UMR R&S), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure Agronomique de Montpellier (ENSA M), Murdoch University, Curtin University of Technology |
| Rok vydání: | 2004 |
| Předmět: |
0106 biological sciences
Murex Soil Science [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study Biology Ph changes medicine.disease_cause 01 natural sciences Microbiology Rhizobia Botany NODULATION DELAY ROOT MAT RELATION PLANTE-SOL medicine Medicago sativa VIDEODENSITOMETRY Rhizosphere RHIZOBIA ACID PRODUCTION food and beverages 04 agricultural and veterinary sciences 15. Life on land biology.organism_classification RHIZOSPHERE PH Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Medicago murex PROTON RELEASE 010606 plant biology & botany Sinorhizobium medicae |
| Zdroj: | Soil Biology and Biochemistry Soil Biology and Biochemistry, Elsevier, 2005, 36 (8), pp.1357-1365. ⟨10.1016/j.soilbio.2004.04.017⟩ |
| ISSN: | 0038-0717 |
| Popis: | International audience; 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 |
| Databáze: | OpenAIRE |
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