“Biological Nitrogen Fixation” Book Summary

Bruijn, Frans J. de

doi:10.4236/aim.2016.66040

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…Nitrate, nitrite, or ammonia forms of nitrogen are convenient for plant uptake and assimilation [2,3]. Biological nitrogen fixation, essentially a prokaryotic ability, converts the atmospheric nitrogen (N 2 ) into the plant assimilable forms [4]. The bacteria depend on less oxygenic areas like the root endosphere to perform this fixation.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of two endophytic associative nitrogen-fixing Caulobacter spp., from three non-nodulating endemic legumes based on nifH gene analysis

Thamizhseran¹,

Shendye²

2022

J App Biol biotech

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Legumes are cosmopolitan plants, and nodulating legumes are well known for their symbiotic nitrogen-fixing ability by rhizobia-legume interaction. Biological nitrogen fixation in non-nodulating endemic legumes by associative or endophytic symbiotic bacteria requires much needed attention. Three non-nodulating legumes, namely, Humboldtia brunonis Wall., Kunstleria keralensis C.N. Mohanan and N.C. Nair, and Bauhinia phoenicea Wight and Arn., endemic to the Western Ghats regions of Karnataka state, were studied. Employed techniques of selective culture media to understand diazotrophic diversity inside the roots of these plants. The isolates that can grow in a nitrogenfree semisolid agar medium have been considered positive for nitrogen-fixing ability. nifH gene is taken as the marker gene to ascertain the nitrogen-fixing ability of the bacteria. The qualified bacterium in the previous steps is identified using 16s RNA sequencing and the Sanger sequence method. The results obtained showed B. phoenicea Wight and Arn. and H. brunonis Wall. as Caulobacter segnis, and in K. keralensis C.N. Mohanan & N.C. Nair, it is Caulobacter crescentus. The presence of the nifH gene is demonstrated through molecular methods. This work adds to the diverse works of Caulobacter as a successful plant growth-promoting endophyte even in the nitrogen-deficient, slopy soils of the Western Ghats.

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Section: Introductionmentioning

confidence: 99%

Occurrence of two endophytic associative nitrogen-fixing Caulobacter spp., from three non-nodulating endemic legumes based on nifH gene analysis

Thamizhseran¹,

Shendye²

2022

J App Biol biotech

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“…The amount of nitrogen fixed by soybean in symbiosis with Bradyrhizobium japonicum is estimated yearly to 450 kg•ha −1 [4]. It considerably reduces the need of synthetic nitrogen fertilizers supply of crops which continuous application could be harmful to soil fertility and accelerate environmental pollution [5] [6] [7]. Thereby, maintaining this natural significant nitrogen input should be better for economical and ecological sustainable soybean yields.…”

Section: Introductionmentioning

confidence: 99%

Response of Indigenous Rhizobia to the Inoculation of Soybean [<i>Glycine max</i> (L.) Merrill] Varieties Cultivated under Controlled Conditions in Côte d’Ivoire

Kouadio¹,

Fondio²,

Konaté³

et al. 2020

AiM

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Soybean [Glycine max (L.) Merrill] is an important crop known to improve population nutritional status and increase soil fertility and its productivity through biological nitrogen fixation. In Côte d'Ivoire, the introduced Bradyrhizobium japonicum used as inoculum had slight compatibility to several soybean varieties compromising their vulgarization. Therefore, the present study was conducted to examine the infectiveness and the effectiveness of indigenous rhizobial isolates on three soybean varieties (Canarana, Doko and Piramana) cultivated in Côte d'Ivoire. The experiment was conducted with potted plant filled with sterilized sand and was statistically laid in Completely Randomized Design (CRD) with sixteen (16) natives rhizobia, one (01) reference strain and uninoculated control (with or without nitrogen) with three replications. The results showed that inoculation significantly improved nodule number, nodule dry weight, plant height and total dry matter of soybean over the negative control treatment. Among the inoculated treatments, five indigenous rhizobia RSC119, RSC324, RSC502, RSC504 and RSC508 significantly (P < 0.05) increased the nodulation and plant growth parameters than B. japonicum (IRAT FA3) with Doko and Piramana. RSC502 produced highest nodule number (64) on Piramama, nodule dry weight was most promoted with RSC504 (321 mg•plant −1 ) compared to IRAT FA3 strain (95 mg•plant −1 ) on Doko. The higher effectiveness was recorded with RSC119, RSC504 and RSC502 with 206.73%; 201.79% and 200.45% respectively compared to TN How to cite this paper: Amani, K., Fondio, L., (100%). The correlation analysis indicated significant association of nodule number and total biomass indicating the importance of symbiotic nitrogen fixation. Based on their infectiveness and their effectiveness, the isolates RSC119, RSC324, RSC502, RSC504 and RSC508 could be used as elite local rhizobia and tested in field conditions to establish their potential contribution on soybean productivity.

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“…Nitrogen (N) is essential for plant growth, participating in several metabolic pathways and in the synthesis of molecules such as proteins, nucleic acids, hormones, and chlorophyll (Saturno et al, 2017;Bruijn, 2016).…”

Section: Macronutrients Nitrogenmentioning

confidence: 99%

Limitations and strategies to enhance biological nitrogen fixation in sub-humid tropics of Western Ethiopia

Dabessa¹,

Abebe²,

Bekele³

2018

J. Agric. Biotech. Sustain. Dev.

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Currently, inorganic nitrogen fertilizer becomes a serious threat to the environment and human health. Thus, finding alternate source of nitrogen is a viable option in assuring sustainable agricultural system. Biological nitrogen fixation is a critical and key process in sustainable agricultural systems in tropical soils, which are frequently deficient in N and susceptible to leaching of plant nutrients. This process transforms atmospheric nitrogen to ammonia, nitrate and nitrogen dioxide. Several key abiotic and biotic factors limit legume productivity and biological nitrogen fixation in World agriculture, especially in sub-Saharan Africa. Within the soil, rhizobia frequently encounter various stresses that affect their growth, initial steps of symbiosis and capability of nitrogen fixation. Biotic and abiotic stresses impose a major threat to agriculture and symbiotic nitrogen fixation is dependent on host cultivar and rhizobia, but as well may be limited by pedoclimatic factors. The most common factors affecting biological nitrogen fixation and symbiosis activity in western parts of Ethiopia are soil acidity, quality of inoculants and low soil fertility. In most cases, the microsymbiont is the more affected partner, with plants growing on mineral N usually less sensitive to these stresses. Thus, it can be concluded that, particularly in a western part of Ethiopia, many studies should be focused on acidity related constraints on biological nitrogen fixation, screening of acid tolerant inoculants and low soil fertility improvements to enhance biological nitrogen fixation in smallholder farming system.

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“Biological Nitrogen Fixation” Book Summary

Cited by 6 publications

References 11 publications

Occurrence of two endophytic associative nitrogen-fixing Caulobacter spp., from three non-nodulating endemic legumes based on nifH gene analysis

Occurrence of two endophytic associative nitrogen-fixing Caulobacter spp., from three non-nodulating endemic legumes based on nifH gene analysis

Response of Indigenous Rhizobia to the Inoculation of Soybean [<i>Glycine max</i> (L.) Merrill] Varieties Cultivated under Controlled Conditions in Côte d’Ivoire

Limitations and strategies to enhance biological nitrogen fixation in sub-humid tropics of Western Ethiopia

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“Biological Nitrogen Fixation” Book Summary

Cited by 6 publications

References 11 publications

Occurrence of two endophytic associative nitrogen-fixing Caulobacter spp., from three non-nodulating endemic legumes based on nifH gene analysis

Occurrence of two endophytic associative nitrogen-fixing Caulobacter spp., from three non-nodulating endemic legumes based on nifH gene analysis

Response of Indigenous Rhizobia to the Inoculation of Soybean [&lt;i&gt;Glycine max&lt;/i&gt; (L.) Merrill] Varieties Cultivated under Controlled Conditions in C&#244;te d’Ivoire

Limitations and strategies to enhance biological nitrogen fixation in sub-humid tropics of Western Ethiopia

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Response of Indigenous Rhizobia to the Inoculation of Soybean [<i>Glycine max</i> (L.) Merrill] Varieties Cultivated under Controlled Conditions in Côte d’Ivoire