INTERACTIONS BETWEEN COMMON BEAN GENOTYPES AND RHIZOBIA STRAINS ISOLATED FROM MOROCCAN SOILS FOR GROWTH,PHOSPHATASE AND PHYTASE ACTIVITIES UNDER PHOSPHORUS DEFICIENCY CONDITIONS |
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| Authors: | Btissam Mandri Jean-Jacques Drevon Adnane Bargaz Khalid Oufdou Mustapha Faghire Claude Plassard |
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| Institution: | 1. Unit of Plant Biotechnology and Symbiosis Agrophysiology, Faculty of Sciences and Techniques , Marrakesh , Morocco;2. Environmental Microbiology and Toxicology Unit, Laboratory of Biology and Biotechnology of Microorganisms, Faculty of Sciences-Semlalia , Marrakesh , Morocco;3. UMR Biogéochimie du Sol et de la Rhizosphère, INRA , Montpellier , France;4. UMR Biogéochimie du Sol et de la Rhizosphère, INRA , Montpellier , France;5. Environmental Microbiology and Toxicology Unit, Laboratory of Biology and Biotechnology of Microorganisms, Faculty of Sciences-Semlalia , Marrakesh , Morocco |
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| Abstract: | The improvement of common bean production requires the selection of effective rhizobia strains and Phaseolus vulgaris genotypes adapted to available soil phosphorus limitations. The interactions between bean genotypes and rhizobia were studied in hydroponic culture using six genotypes and four strains, CIAT899 as reference and three strains isolated from nodule of farmer's fields in the Marrakech region. The phosphorus (P) sub-deficiency caused a significant reduction on shoot biomass in some bean genotype-rhizobia combinations. Nodule biomass is significantly more reduced under P limitation for several combinations tested. Bean plants inoculated with these local rhizobial strains showed higher nodulation and an increase of nodules phytase and phosphatase activities under phosphorus sub-deficiency especially for RhM11 strain. It was concluded that the studied bean-rhizobia symbiosis differ in their adaptation to phosphorus sub-deficiency and the nodule phosphatases and phytases activities may constitute a strategy of nodulated bean plants to adapt their nitrogen fixation to P deficiency. |
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| Keywords: | interactions Phaseolus vulgaris phosphatase phosphorus phytase rhizobia |
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