Cyanobacterial extracellular polymeric substances (EPS): Biosynthesis and their potential applications

Nishanth, Sekar; Bharti, Asha; Gupta, Himani; Gupta, Krati; Gulia, Udita; Prasanna, Radha

doi:10.1016/b978-0-12-820084-1.00015-6

Cited by 16 publications

(6 citation statements)

References 78 publications

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“…Moreover, bacteria also contain polysaccharide–lipid complexes (PLs) and high molecular weight lipopolysaccharide–protein complexes (carbohydrate complexes) that are primarily responsible for desiccation resistance. In addition, EPS can facilitate microbe–plant interactions [ 244 , 246 , 247 ] by providing microenvironments that enable microbes to survive in stressful conditions. In addition, it helps bacteria colonize the plant by allowing them to attach to root exudates.…”

Section: Pgpb For Plant Growth Promotion and Stress Tolerancementioning

confidence: 99%

Mechanistic Insights of Plant Growth Promoting Bacteria Mediated Drought and Salt Stress Tolerance in Plants for Sustainable Agriculture

Gupta

Mishra

Rai

et al. 2022

IJMS

109

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Climate change has devastating effects on plant growth and yield. During ontogenesis, plants are subjected to a variety of abiotic stresses, including drought and salinity, affecting the crop loss (20–50%) and making them vulnerable in terms of survival. These stresses lead to the excessive production of reactive oxygen species (ROS) that damage nucleic acid, proteins, and lipids. Plant growth-promoting bacteria (PGPB) have remarkable capabilities in combating drought and salinity stress and improving plant growth, which enhances the crop productivity and contributes to food security. PGPB inoculation under abiotic stresses promotes plant growth through several modes of actions, such as the production of phytohormones, 1-aminocyclopropane-1-carboxylic acid deaminase, exopolysaccharide, siderophore, hydrogen cyanide, extracellular polymeric substances, volatile organic compounds, modulate antioxidants defense machinery, and abscisic acid, thereby preventing oxidative stress. These bacteria also provide osmotic balance; maintain ion homeostasis; and induce drought and salt-responsive genes, metabolic reprogramming, provide transcriptional changes in ion transporter genes, etc. Therefore, in this review, we summarize the effects of PGPB on drought and salinity stress to mitigate its detrimental effects. Furthermore, we also discuss the mechanistic insights of PGPB towards drought and salinity stress tolerance for sustainable agriculture.

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Section: Pgpb For Plant Growth Promotion and Stress Tolerancementioning

confidence: 99%

Mechanistic Insights of Plant Growth Promoting Bacteria Mediated Drought and Salt Stress Tolerance in Plants for Sustainable Agriculture

Gupta

Mishra

Rai

et al. 2022

IJMS

109

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show abstract

“…The release of various biologically active substances such as gibberellin, auxin, cytokinins [42], vitamins, amino acids, polypeptides, antibacterial and antifungal substances, and polymers, particularly exopolysaccharides [43] had a positive effect on crop yield. Indole acetic acid content increased as soil microbial count increased [44].…”

Section: Dehydrogenase Activity (Dha) Andmentioning

confidence: 99%

Impact of Soil Conditioners and Cyanobacteria under Varied Irrigation Levels on Growth and Productivity of Wheat (Triticum aestivum L.) in Sandy Soil

Salem,

EL-Edfawy,

Mohamed

et al. 2023

AJB2T

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During the winter seasons 2021/2022 and 2022/2023, two field experiments were conducted at the Ismailia Experiment Research Station in Ismailia Governorate, Egypt, to assess the effect of soil conditioners and cyanobacteria at different irrigation levels on the growth and productivity of wheat plants grown in sandy soil. The experimental treatments were arranged in the split-split plot design shown below: Two bio fertilizer treatments were represented by subplot A0: no application and A1: cyanobacteria (Anabaena crcinalis) inoculation. Four natural soil conditioner treatments at a rate of 2.4 mg ha-1 were arranged in sub-sub plot (control): no application, (Z) zeolite, (B) bentonite, and (F) feldspar. The results revealed that cyanobacteria inoculation combined with natural soil conditioners resulted in positive and statistically significant increases in all parameters studied. The highest mean values were obtained in the majority of cases when cyanobacteria and feldspar were combined in a 70% irrigation level, with no significant difference when cyanobacteria and feldspar were combined in full irrigation level. All growth parameters were increased per plant. The investigated factors had a significant impact on NPK uptake by grains and straw, total amino acid percentages in wheat grains, and available NPK in soil. Furthermore, the presence of cyanobacteria associated with soil conditioners led to an increase in soil dehydrogenase, indole acetic acid levels. Therefore, the objectives of this study were to use cyanobacteria and soil conditioners as natural resources to minimize water use while boosting the production and growth characteristics of wheat plants. Finally, the findings of this study suggested that inoculating wheat plants with cyanobacteria in combination with soil conditioners can reduce up to 30% of the total amount of water required by wheat plants, and that using natural resources and bio fertilizer can be recommended to improve soil fertility while minimizing the environmental impact of chemical fertilizer.

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“…The EPS produced by the adherent forms a matrix within which the cells build their community and attain their maximum cell density. The EPS encapsulating the cells in a biofilm is an amalgamation of constituents, including extracellular-DNA (e-DNA), autosensing molecules, persister cells, proteins, lipids and polysaccharides [55][56][57][58]. The polysaccharides in the matrix provide strength to the cells within the biofilm, such as adherence, shielding, and structural rigidity [59,60].…”

Section: Biofilm Matrix Formationmentioning

confidence: 99%

Development of Antibiofilm Therapeutics Strategies to Overcome Antimicrobial Drug Resistance

et al. 2022

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A biofilm is a community of stable microorganisms encapsulated in an extracellular matrix produced by themselves. Many types of microorganisms that are found on living hosts or in the environment can form biofilms. These include pathogenic bacteria that can serve as a reservoir for persistent infections, and are culpable for leading to a broad spectrum of chronic illnesses and emergence of antibiotic resistance making them difficult to be treated. The absence of biofilm-targeting antibiotics in the drug discovery pipeline indicates an unmet opportunity for designing new biofilm inhibitors as antimicrobial agents using various strategies and targeting distinct stages of biofilm formation. The strategies available to control biofilm formation include targeting the enzymes and proteins specific to the microorganism and those involved in the adhesion pathways leading to formation of resistant biofilms. This review primarily focuses on the recent strategies and advances responsible for identifying a myriad of antibiofilm agents and their mechanism of biofilm inhibition, including extracellular polymeric substance synthesis inhibitors, adhesion inhibitors, quorum sensing inhibitors, efflux pump inhibitors, and cyclic diguanylate inhibitors. Furthermore, we present the structure–activity relationships (SAR) of these agents, including recently discovered biofilm inhibitors, nature-derived bioactive scaffolds, synthetic small molecules, antimicrobial peptides, bioactive compounds isolated from fungi, non-proteinogenic amino acids and antibiotics. We hope to fuel interest and focus research efforts on the development of agents targeting the uniquely complex, physical and chemical heterogeneous biofilms through a multipronged approach and combinatorial therapeutics for a more effective control and management of biofilms across diseases.

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Cyanobacterial extracellular polymeric substances (EPS): Biosynthesis and their potential applications

Cited by 16 publications

References 78 publications

Mechanistic Insights of Plant Growth Promoting Bacteria Mediated Drought and Salt Stress Tolerance in Plants for Sustainable Agriculture

Mechanistic Insights of Plant Growth Promoting Bacteria Mediated Drought and Salt Stress Tolerance in Plants for Sustainable Agriculture

Impact of Soil Conditioners and Cyanobacteria under Varied Irrigation Levels on Growth and Productivity of Wheat (Triticum aestivum L.) in Sandy Soil

Development of Antibiofilm Therapeutics Strategies to Overcome Antimicrobial Drug Resistance

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