Competition between strains ofBradyrhizobium japonicum for nodulation of soybeans at different nitrogen fertilizer levels

Mårtensson, Anna; Brutti, Lucrecia; Ljunggren, Hans

doi:10.1007/bf02220715

Cited by 10 publications

(6 citation statements)

References 18 publications

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“…Nodulation per se (i.e. establishment of an interaction) does not always translate into effective symbiosis benefiting the plant, as a single plant individual can be colonized by multiple strains of bacteria differing in nitrogen-fixing effectiveness (Mårtensson et al, 1989;Kiers et al, 2006). Different strains of the same rhizobial species can differ in their effectiveness (Dwivedi et al, 2015), even in association with the same host legume species (Thrall et al, 2000(Thrall et al, , 2011Klock et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Legume–rhizobium symbiotic promiscuity and effectiveness do not affect plant invasiveness

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Legume–rhizobium symbiotic promiscuity and effectiveness do not affect plant invasiveness

et al. 2017

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“…An additional level of competition occurs at single nodule level. Several studies have reported the occurrence of a bacterial community composed by symbiotic rhizobia and by other (apparently non-symbiotic) strains in soybean, common bean, cowpea, and clover ( Moawad and Schmidt, 1987 ; Mårtensson et al, 1989 ; Sessitsch et al, 1997 ; Denison, 2000 ). The colonization of the same nodule by different symbiotic strains may allow to establish a sort of cooperation between symbiotic rhizobia to overcome plant sanctions in the case of non-mutualist (e.g., which do not fix atmospheric nitrogen) or less-mutualist rhizobial partners (e.g., which have a limited nitrogenase functionality), but also may pave the way to ‘free riders’ or cheaters, which can be masked against sanctions directed toward the whole nodule, as shown on Bradyrhizobia ( Denison, 2000 ).…”

Section: Introductionmentioning

confidence: 99%

Mixed Nodule Infection in Sinorhizobium meliloti–Medicago sativa Symbiosis Suggest the Presence of Cheating Behavior

et al. 2016

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In the symbiosis between rhizobia and legumes, host plants can form symbiotic root nodules with multiple rhizobial strains, potentially showing different symbiotic performances in nitrogen fixation. Here, we investigated the presence of mixed nodules, containing rhizobia with different degrees of mutualisms, and evaluate their relative fitness in the Sinorhizobium meliloti–Medicago sativa model symbiosis. We used three S. meliloti strains, the mutualist strains Rm1021 and BL225C and the non-mutualist AK83. We performed competition experiments involving both in vitro and in vivo symbiotic assays with M. sativa host plants. We show the occurrence of a high number (from 27 to 100%) of mixed nodules with no negative effect on both nitrogen fixation and plant growth. The estimation of the relative fitness as non-mutualist/mutualist ratios in single nodules shows that in some nodules the non-mutualist strain efficiently colonized root nodules along with the mutualist ones. In conclusion, we can support the hypothesis that in S. meliloti–M. sativa symbiosis mixed nodules are formed and allow non-mutualist or less-mutualist bacterial partners to be less or not sanctioned by the host plant, hence allowing a potential form of cheating behavior to be present in the nitrogen fixing symbiosis.

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“…Rhizobia showed varied responses to combined N with regard to competition for nodule occupancy. Variations in the competitive abilities of three strains of B. japonicum for nodulation of soybean (G. max) at increasing fertilizer-N concentrations (up to 10 g of N m Ϫ2 ) have been reported (201). It has also been reported that combined N altered the nodule occupancy of two strains of rhizobia in soybean (208), while nitrogen treatment had no significant effect on nodule occupancy by three strains each of B. japonicum (nodulating soybean) and R. leguminosarum bv.…”

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confidence: 99%

Rhizobium -Legume Symbiosis and Nitrogen Fixation under Severe Conditions and in an Arid Climate

Zahran

1999

Microbiol Mol Biol Rev

1,371

635

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SUMMARY Biological N2 fixation represents the major source of N input in agricultural soils including those in arid regions. The major N2-fixing systems are the symbiotic systems, which can play a significant role in improving the fertility and productivity of low-N soils. The Rhizobium-legume symbioses have received most attention and have been examined extensively. The behavior of some N2-fixing systems under severe environmental conditions such as salt stress, drought stress, acidity, alkalinity, nutrient deficiency, fertilizers, heavy metals, and pesticides is reviewed. These major stress factors suppress the growth and symbiotic characteristics of most rhizobia; however, several strains, distributed among various species of rhizobia, are tolerant to stress effects. Some strains of rhizobia form effective (N2-fixing) symbioses with their host legumes under salt, heat, and acid stresses, and can sometimes do so under the effect of heavy metals. Reclamation and improvement of the fertility of arid lands by application of organic (manure and sewage sludge) and inorganic (synthetic) fertilizers are expensive and can be a source of pollution. The Rhizobium-legume (herb or tree) symbiosis is suggested to be the ideal solution to the improvement of soil fertility and the rehabilitation of arid lands and is an important direction for future research.

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Competition between strains ofBradyrhizobium japonicum for nodulation of soybeans at different nitrogen fertilizer levels

Cited by 10 publications

References 18 publications

Legume–rhizobium symbiotic promiscuity and effectiveness do not affect plant invasiveness

Legume–rhizobium symbiotic promiscuity and effectiveness do not affect plant invasiveness

Mixed Nodule Infection in Sinorhizobium meliloti–Medicago sativa Symbiosis Suggest the Presence of Cheating Behavior

Rhizobium -Legume Symbiosis and Nitrogen Fixation under Severe Conditions and in an Arid Climate

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