NDLI: Rhizobium gallicum as an efficient symbiont for bean cultivation

Content Provider	Springer Nature Link
Author	Mnasri, Bacem Tajini, Fatma Trabelsi, Mustapha Aouani, Mohamed Elarbi Mhamdi, Ridha
Copyright Year	2007
Abstract	Rhizobia are soil bacteria that fix atmospheric nitrogen in symbiosis with legumes in specialized organs called nodules. The legumes thus acquire the autonomy to grow in nitrogen-deficient soils. When nitrogen fixation by indigenous rhizobia is limited, field inoculation with efficient and competitive strains is an economically feasible way to increase production. When the inoculant is made from native strains of rhizobia the success of inoculation should be increased, since local strains are better adapted than commercial inoculants. Here, a Rhizobium gallicum strain, 8a3, previously selected for its competitiveness and symbiotic effectiveness with common bean under laboratory conditions, was tested in field trials in Tunisia. The experiments were conducted in six fields using three common bean cultivars. The majority of the fields showed a low density of the native rhizobia and inefficient nodulation by Sinorhizobium meliloti, a known symbiont of Medicago. Our results show that inoculation with R. gallicum strain 8a3 induced an increase in nodule numbers accompanied by a more than twofold increase in shoot dry yield. Monitoring of the nodulation occupancy through the fingerprinting of the repetitive extragenic palindromic sequences (REP-PCR) showed that strain 8a3 was competitive even in the soil showing a high population density of indigenous R. gallicum, and occupied more than 40% of the nodules. Moreover, in vitro antibiosis assays indicated that strain 8a3 produces antimicrobial activity on agar medium against indigenous common bean rhizobia, including the inefficient strains of S. meliloti. These results point out the benefits that could be achieved by selecting efficient and competitive strains among natural populations of rhizobia.
Starting Page	331
Ending Page	336
Page Count	6
File Format	PDF
ISSN	17740746
Journal	Agronomy for Sustainable Development
Volume Number	27
Issue Number	4
e-ISSN	17730155
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-01-01
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agriculture Soil Science & Conservation Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Agronomy and Crop Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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Rhizobium gallicum as an efficient symbiont for bean cultivation

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