Nitrogen Fixing Cyanobacteria: Future Prospect

Issa, Ahmed A.; Abd‐Alla, Mohamed Hemida; Ohyama, Takuji

doi:10.5772/56995

Cited by 33 publications

(17 citation statements)

References 108 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cyanobacteria dominating the biocrusts are extremophiles primary colonizers organisms which improve soil conditions and fertility in dryland regions [3]. They are also able to x CO 2 [4] and N 2 [5], and release to the soils a wide variety of substances such as carbohydrates, polyphenols, sucrose, glucose [6], exopolysaccharides [7], phosphorus, phytormones, vitamins [8], antimicrobial compounds [9], and other biochemical metabolites including scytonemin, mycosporine-like amino acid, among other [10,11]. The leaching of these compounds to the underlying soils provides a favourable and selective microhabitat for a wide diversity of soil bacterial communities [12].…”

Section: Introductionmentioning

confidence: 99%

Studying the Microbiome of Cyanobacterial Biocrusts From Drylands and Its Functional Influence on Biogeochemical Cycles

Ortega

Montero-Calasanz

2021

Preprint

View full text Add to dashboard Cite

Background: Drylands are areas under continuous degradation and desertification largely covered by cyanobacterial biocrusts. Several studies have already shown that soil microorganisms play a fundamental role in the correct soil functioning. Nevertheless, little is known about the relationship taxonomy-function in arid soils and, in particular, in cyanobacterial biocrusts. An in-depth study of the taxonomic composition and the functions carried out by soil microorganisms in biogeochemical cycles was here carried out by using a shotgun metagenomic approach. Results: Metagenomic analysis carried out in this study showed a high taxonomic and functional similarity in both incipient and mature cyanobacterial biocrusts types with a dominance of Proteobacteria, Actinobacteria and Cyanobacteria. The predominant functional categories related to soil biogeochemical cycles were “carbon metabolism” followed by “phosphorus, nitrogen, sulfur, potassium and iron metabolism”. Reads involved in the metabolism of carbohydrates and respiration were the most abundant functional classes. In the N cycle dominated “ammonia assimilation” and “Nitrate and nitrite ammonification”. The major taxonomic groups also seemed to drive phosphorus and potassium cycling by the production of organic acids and the presence of extracellular enzymes and specialised transporters. Sulfur assimilation was also predominantly led by actinobacteria via the acquisition of sulfur from organosulfonated compounds. The main strategy followed for iron uptake seemed to be the synthesis and release of siderophores, mostly derived from representatives of the genus Pseudomonas. Conclusions: The absence of significant differences between both type of biocrusts was suggested to be due to the identical habitat-specific characteristics, the inherent variability associated with metagenomic sampling and experimental design limitations. There is metabolic diversity of respiration processes over the photosynthesis, but a diverse group of microorganisms, predominantly Actinobacteria and Proteobacteria were also involved in CO2 fixation metabolism. A preferential uptake of ammonium over nitrate as an economic strategy to avoid the high consumption of ATP was confirmed. Moreover, the functional redundancy presented by the microbial community was interpreted as a strategy to maintain the correct functioning of the soil biogeochemical cycles and therefore of the ecosystem in general. Evidence of sythrophic growth was nevertheless observed. Biotechnological potential as plant growth promoters was also identified.

show abstract

Section: Introductionmentioning

confidence: 99%

Studying the Microbiome of Cyanobacterial Biocrusts From Drylands and Its Functional Influence on Biogeochemical Cycles

Ortega

Montero-Calasanz

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…BNF is performed by symbiotic, endophytic, or free-living microorganisms [71,72]. Symbiotic bacteria associate with plants forming root nodules (rhizobia), where they fix nitrogen while benefiting from plant photoassimilates.…”

Section: Biological Nitrogen Fixationmentioning

confidence: 99%

“…Nitrogen-fixing microorganisms occur naturally in soil [71] and in water [72] or colonize seeds [74]. However, in the agricultural environment, conventional practices such as plowing, harrowing, chemical fertilization, and pesticide application reduce the soil microorganism populations, which make these areas depending on the application of nitrogen fertilizers [75,76].…”

Section: Biological Nitrogen Fixationmentioning

confidence: 99%

Organic Nitrogen in Agricultural Systems

Silva¹,

Melo²,

Sombra³

et al. 2020

Nitrogen Fixation

View full text Add to dashboard Cite

This work summarizes information about organic nitrogen (N) in the agricultural system. The organic N forms in soils have been studied by identifying and quantifying the released organic compounds when soils are acid treated at high temperature, in which the following organic N fractions are obtained: hydrolyzable total N, subdivided into hydrolyzable NH 4 + -N, amino sugars-N, amino acids-N, and unidentified-N and acid insoluble N, a fraction that remains associated with soil minerals after acid hydrolysis. Nitrogen mineralization and immobilization are biochemical processes in nature. This chapter summarizes how these processes occur in the agricultural system. Then, soluble organic nitrogen (SON), volatilization and denitrification processes, and biological nitrogen fixation (BNF) as a key component of the nitrogen cycle and how it makes N available to plants are also discussed. Finally, we discuss the use of organic fertilizers as N source to satisfy the worldwide demand for organic foods produced without synthetic inputs.

show abstract

“…Rice production in tropical countries mainly depends on biological N 2 fixation by cyanobacteria which are a natural component of paddy fields (Vaishampayan et al, 2001). In these cultivated agriculture systems, annually ∼32 Tg of nitrogen is fixed by biological nitrogen fixers (Singh et al, 2016), and cyanobacteria add about 20-30 kg fixed nitrogen ha −1 along with organic matter to the paddy fields (Subramanian and Sundaram, 1986;Issa et al, 2014). Cyanobacteria also make symbiotic associations with different photosynthetic and non-photosynthetic organisms such as algae, fungi, diatoms, bryophytes, hornworts, liverworts, mosses, pteridophytes, gymnosperms, and angiosperms (Rai et al, 2000;Sarma et al, 2016).…”

Section: Cyanobacteria As Biofertilizersmentioning

confidence: 99%

Cyanobacterial Farming for Environment Friendly Sustainable Agriculture Practices: Innovations and Perspectives

Pathak

Rajneesh

Maurya

et al. 2018

Front. Environ. Sci.

179

View full text Add to dashboard Cite

Sustainable supply of food and energy without posing any threat to environment is the current demand of our society in view of continuous increase in global human population and depletion of natural resources of energy. Cyanobacteria have recently emerged as potential candidates who can fulfill abovementioned needs due to their ability to efficiently harvest solar energy and convert it into biomass by simple utilization of CO 2 , water and nutrients. During conversion of radiant energy into chemical energy, these biological systems produce oxygen as a by-product. Cyanobacterial biomass can be used for the production of food, energy, biofertilizers, secondary metabolites of nutritional, cosmetics, and medicinal importance. Therefore, cyanobacterial farming is proposed as environment friendly sustainable agricultural practice which can produce biomass of very high value. Additionally, cyanobacterial farming helps in decreasing the level of greenhouse gas, i.e., CO 2 , and it can be also used for removing various contaminants from wastewater and soil. However, utilization of cyanobacteria for resolving the abovementioned problems is subjected to economic viability. In this review, we provide details on different aspects of cyanobacterial system that can help in developing sustainable agricultural practices. We also describe different large-scale cultivation systems for cyanobacterial farming and discuss their merits and demerits in terms of economic profitability.

show abstract

Nitrogen Fixing Cyanobacteria: Future Prospect

Cited by 33 publications

References 108 publications

Studying the Microbiome of Cyanobacterial Biocrusts From Drylands and Its Functional Influence on Biogeochemical Cycles

Studying the Microbiome of Cyanobacterial Biocrusts From Drylands and Its Functional Influence on Biogeochemical Cycles

Organic Nitrogen in Agricultural Systems

Cyanobacterial Farming for Environment Friendly Sustainable Agriculture Practices: Innovations and Perspectives

Contact Info

Product

Resources

About