Azotobacter: A potential bio-fertilizer for soil and plant health management

Sumbul, Aisha; Ansari, Rizwan Ali; Rizvi, Rose; Mahmood, Irshad

doi:10.1016/j.sjbs.2020.08.004

Cited by 129 publications

(57 citation statements)

References 74 publications

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“…Despite various experimental data available on Azotobacter biostimulation traits on overall plant growth, the exact mode of action by which Azotobacter can enhance plant growth is not yet fully understood (Sumbul et al, 2020). However, the main mode of action evidently includes BNF, considering the capacity of these bacteria to fix N 2 , a vital macronutrient for plant growth.…”

Section: Nitrogen Fixation Plant Growth Promoting Traits and Stress mentioning

confidence: 99%

Nitrogen Fixing Azotobacter Species as Potential Soil Biological Enhancers for Crop Nutrition and Yield Stability

et al. 2021

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Biological nitrogen fixation (BNF) refers to a microbial mediated process based upon an enzymatic “Nitrogenase” conversion of atmospheric nitrogen (N2) into ammonium readily absorbable by roots. N2-fixing microorganisms collectively termed as “diazotrophs” are able to fix biologically N2 in association with plant roots. Specifically, the symbiotic rhizobacteria induce structural and physiological modifications of bacterial cells and plant roots into specialized structures called nodules. Other N2-fixing bacteria are free-living fixers that are highly diverse and globally widespread in cropland. They represent key natural source of nitrogen (N) in natural and agricultural ecosystems lacking symbiotic N fixation (SNF). In this review, the importance of Azotobacter species was highlighted as both important free-living N2-fixing bacteria and potential bacterial biofertilizer with proven efficacy for plant nutrition and biological soil fertility. In addition, we described Azotobacter beneficial plant promoting traits (e.g., nutrient use efficiency, protection against phytopathogens, phytohormone biosynthesis, etc.). We shed light also on the agronomic features of Azotobacter that are likely an effective component of integrated plant nutrition strategy, which contributes positively to sustainable agricultural production. We pointed out Azotobacter based-biofertilizers, which possess unique characteristics such as cyst formation conferring resistance to environmental stresses. Such beneficial traits can be explored profoundly for the utmost aim to research and develop specific formulations based on inoculant Azotobacter cysts. Furthermore, Azotobacter species still need to be wisely exploited in order to address specific agricultural challenges (e.g., nutrient deficiencies, biotic and abiotic constraints) taking into consideration several variables including their biological functions, synergies and multi-trophic interactions, and biogeography and abundance distribution.

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Section: Nitrogen Fixation Plant Growth Promoting Traits and Stress mentioning

confidence: 99%

Nitrogen Fixing Azotobacter Species as Potential Soil Biological Enhancers for Crop Nutrition and Yield Stability

et al. 2021

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“…Azotobacter species were model organisms to study nitrogenase and the mechanisms of nitrogen fixation (Baars et al, 2016;Danyal et al, 2016;Rebelein et al, 2018). Meanwhile, Azotobacter species is important as free-living, nitrogen-fixing bacteria and potential bacterial biofertilizer (Sumbul et al, 2020;Aasfar et al, 2021). In addition, A. chroococcum has other characteristics, such as phosphorus hydrolysis, synthetic indoles, and alginate (Romero-Perdomo et al, 2017;Gawin et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Rhamnolipid Enhances the Nitrogen Fixation Activity of Azotobacter chroococcum by Influencing Lysine Succinylation

Pan

Yang

et al. 2021

Front. Microbiol.

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The enhancement of nitrogen fixation activity of diazotrophs is essential for safe crop production. Lysine succinylation (KSuc) is widely present in eukaryotes and prokaryotes and regulates various biological process. However, knowledge of the extent of KSuc in nitrogen fixation of Azotobacter chroococcum is scarce. In this study, we found that 250 mg/l of rhamnolipid (RL) significantly increased the nitrogen fixation activity of A. chroococcum by 39%, as compared with the control. Real-time quantitative reverse transcription PCR (qRT-PCR) confirmed that RL could remarkably increase the transcript levels of nifA and nifHDK genes. In addition, a global KSuc of A. chroococcum was profiled using a 4D label-free quantitative proteomic approach. In total, 5,008 KSuc sites were identified on 1,376 succinylated proteins. Bioinformatics analysis showed that the addition of RL influence on the KSuc level, and the succinylated proteins were involved in various metabolic processes, particularly enriched in oxidative phosphorylation, tricarboxylic acid cycle (TCA) cycle, and nitrogen metabolism. Meanwhile, multiple succinylation sites on MoFe protein (NifDK) may influence nitrogenase activity. These results would provide an experimental basis for the regulation of biological nitrogen fixation with KSuc and shed new light on the mechanistic study of nitrogen fixation.

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“…These bacteria derive nutrients from the root exudates and in return, e ciently provide xed nitrogen to the host plant (Tejera et al 2005). Besides xing atmospheric nitrogen, Azotobacter also secretes important phytohormones (IAA, gibberellic acid and cytokinins), vitamins (thiamine, ribo avin) and various antipathogenic agents which promote growth as well as suppress disease incidences (Sumbul et al 2020). Azotobacter chroococcum can aid in seed germination and change root architecture in response to phytopathogen attacks (Romero-Perdomo et al 2017).…”

Section: Discussionmentioning

confidence: 99%

Niche differentiation of microbes and their functional signatures in Assam type tea (Camellia sinensis var. assamica)

Bora¹,

Dey²,

Borah³

et al. 2021

Preprint

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We employed an Illumina-based high throughput metagenomics sequencing approach to unveil the overall rhizospheric as well as endophytic microbial community associated with an organically grown Camellia population located at the Experimental Tea Garden, Assam Agricultural University, Assam (India). Quality control (i.e. adapter trimming and duplicate removal) followed by de novo assembly revealed the tea endophytic metagenome to contain 24,231 contigs (total 7,771,089 base pairs with an average length of 321 bps) while tea rhizospheric soil metagenome contained 261,965 sequences (total 230537174 base pairs, average length 846). The most prominent rhizobacteria belonged to the genus viz., Bacillus (10.34%), Candidatus Koribacter (8.0%), Candidatus Solibacter (6.35%), Burkholderia (5.18%), Acidobacterium (4.08%), Pseudomonas (3.9%), Streptomyces (3.52%), Bradyrhizobium (2.76%) and Enterobacter (2.56%); while the endosphere was dominated by bacterial genus viz., Serratia (42.3%), Methylobacterium (7.6%), Yersinia (5.4%), Burkholderia (2.2%) etc. The presence of few agronomically important bacterial genuses such as Bradyrhizobium (1.18%), Rhizobium (0.8%), Sinorhizobium (0.34%), Azorhizobium and Flavobacterium (0.17% each) were also detected in the endosphere. KEGG pathway mapping highlighted the presence of microbial metabolite pathway genes related to tyrosine metabolism, tryptophan metabolism, glyoxylate and dicarboxylate metabolism and amino sugar metabolism which play important roles in endophytic activities including survival, growth promotion and host adaptation.

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Azotobacter: A potential bio-fertilizer for soil and plant health management

Cited by 129 publications

References 74 publications

Nitrogen Fixing Azotobacter Species as Potential Soil Biological Enhancers for Crop Nutrition and Yield Stability

Nitrogen Fixing Azotobacter Species as Potential Soil Biological Enhancers for Crop Nutrition and Yield Stability

Rhamnolipid Enhances the Nitrogen Fixation Activity of Azotobacter chroococcum by Influencing Lysine Succinylation

Niche differentiation of microbes and their functional signatures in Assam type tea (Camellia sinensis var. assamica)

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