Water-condition effects on rhizobia competition for cowpea nodule occupancy

Krasova-Wade Tatiana, Diouf Omar, Ndoye Ibrahima, Sall Ciré Elimane, Braconnier Serge, Neyra Marc. 2006. Water-condition effects on rhizobia competition for cowpea nodule occupancy. African Journal of Biotechnology, 5 (16) : 1457-1463.

Résumé : Two indigenous bradyrhizobia strains displaying different natural behaviours towards water regime (strain ORS 3257, nodulating more frequently in favourable-water conditions and strain ORS 3260, in limited-water conditions) were studied for their competitivity for nodulation of cowpea (Mouride cultivar) under favourable and limited water conditions in non-sterile soil. The nodule occupancy was studied by PCR-RFLP analysis. Both strains showed good competition with other indigenous rhizobia populations under favourable- and limited-water conditions. Competition between the inoculated strains in the mixture varied between water regimes. In non-limited-water conditions, strain ORS 3257 was the best competitor, whereas in limited-water conditions, strain ORS 3260 was the best competitor. Results indicated that screening of strains according to their environmental origin could ensure successful rhizobia Inoculation.

Classification Agris : F62 - Physiologie végétale - Croissance et développement
P34 - Biologie du sol

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Krasova-Wade Tatiana, IRD (SEN)
• Diouf Omar, CERAAS (SEN)
• Ndoye Ibrahima, IRD (SEN)
• Sall Ciré Elimane, ISRA (SEN)
• Braconnier Serge, CIRAD-AMIS-UPR Modélisation intégrative (FRA)
• Neyra Marc, IRD (SEN)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/539571/)

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