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Characterization of phosphate-solubilizing rhizobia from Vicia faba in Morocco

Maghraoui Tasnime, Benidire Loubna, Lahrouni Majida, Oufdou Khalid, Domergue Odile, Le Roux Christine, Wahbi Sanâa, Duponnois Robin, Hafidi Mohamed, Galiana Antoine, Sanguin Hervé, De Lajudie Philippe. 2014. Characterization of phosphate-solubilizing rhizobia from Vicia faba in Morocco. In : 11th European Nitrogen Fixation Conference, Tenerife, Canary Islands, Spain, 7-10 September 2014. s.l. : s.n., Résumé, p. 297. European Nitrogen Fixation Conference. 11, Tenerife, Espagne, 7 September 2014/10 September 2014.

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Abstract : Low soil phosphorus availability is a major constraint for crops especially when they are depending on symbiotic nitrogen fixation. Some rhizobial strains were reported to solubilize both organic and inorganic complex phosphates. Here we screened rhizobial strains isolated from nodules of faba bean (V. faba L.) cultivated in the low-P Marrakech-Haouz region (Morocco) for their ability to solubilize complex mineral P. Among 80 rhizobial isolates, 20 formed halo around colonies on TCP agar, indicating their ability to solubilize mineral P. Contrasting effects were registered concerning nodulation rate, plant growth and phosphorus uptake of two Moroccan faba bean varieties (Aguadulce and Defes) after inoculation with 8 of these strains in greenhouse conditions, depending on the symboitic conbinations. Molecular characterization of the rhizobial strains was performed by PCR amplification and sequencing of 16S rRNA coding gene, recA and nodD genes. The majority of the rhizobial strains were identified as Rhizobium leguminosarum, but several strains were affiliated to Ensifer meliloti. Strains were also screend for pqqC gene, a gene encoding a Pyrroloquinoline quinone synthase involved in the phosphate-solubilization in some bacteria. pqq C-like sequence could be amplified from 9 rhizobial strains. (Texte intégral)

Classification Agris : F61 - Plant physiology - Nutrition
F62 - Plant physiology - Growth and development
P35 - Soil fertility
P34 - Soil biology

Auteurs et affiliations

  • Maghraoui Tasnime, Université Cadi Ayyad (MAR)
  • Benidire Loubna, Université Cadi Ayyad (MAR)
  • Lahrouni Majida, Université Cadi Ayyad (MAR)
  • Oufdou Khalid, Université Cadi Ayyad (MAR)
  • Domergue Odile, LSTM (FRA)
  • Le Roux Christine, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0003-0668-3589
  • Wahbi Sanâa, Université Cadi Ayyad (FRA)
  • Duponnois Robin, IRD (SEN)
  • Hafidi Mohamed, Université Cadi Ayyad (MAR)
  • Galiana Antoine, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-5293-5049
  • Sanguin Hervé, CIRAD-BIOS-UMR LSTM (FRA)
  • De Lajudie Philippe, IRD (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/574476/)

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