Rhizosphere Bacteria in Plant Growth Promotion, Biocontrol, and Bioremediation of Contaminated Sites: A Comprehensive Review of Effects and Mechanisms

International Journal of Molecular Sciences, Journal Year: 2021, Volume and Issue: 22(19), P. 10529 - 10529

Published: Sept. 29, 2021

Agriculture in the 21st century is facing multiple challenges, such as those related to soil fertility, climatic fluctuations, environmental degradation, urbanization, and increase food demand for increasing world population. In meanwhile, scientific community key challenges crop production from existing land base. this regard, traditional farming has witnessed enhanced per acre yields due irregular injudicious use of agrochemicals, including pesticides synthetic fertilizers, but at a substantial cost. Another major concern modern agriculture that pests are developing pesticide resistance. Therefore, future sustainable requires alternative strategies can enhance an environmentally sound manner. The application rhizobacteria, specifically, plant growth-promoting rhizobacteria (PGPR), chemical gained much attention community. These harbor number mechanisms through which they promote growth, control pests, induce resistance various abiotic stresses. This review presents comprehensive overview involved growth promotion, biocontrol bioremediation contaminated soils. It also focuses on effects PGPR inoculation survival under stress. Furthermore, pros cons rhizobacterial along with directions discussed depth.

Language: Английский

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A review on drought stress in plants: Implications, mitigation and the role of plant growth promoting rhizobacteria

Resources Environment and Sustainability, Journal Year: 2021, Volume and Issue: 5, P. 100032 - 100032

Published: Aug. 11, 2021

Increasing population and subsequent food requirement puts a lot of onus on agriculture worldwide. However, agricultural output is constantly influenced by several factors such as small land holdings, lack proper mechanization, occurrence abiotic biotic stresses. Drought stress one which causes major setbacks to productivity every year. Water scarcity due decline in rainfall increased frequency dry spells give rise drought conditions. Often accompanied other detrimental effects like salinity, heat attack pathogens. In response plants undergo physiological morphological modifications reduced transpiration photosynthesis rate, osmotic adjustments, repressed root shoot growth, overproduction reactive oxygen species (ROS), modified signalling pathways, senescence. These can cause permanent injury the plant hence there need develop mitigation strategies. Employment nanoparticles, film farming, use resistant varieties, super-absorbent hydrogels, biochar are some techniques used ameliorate stress. Though, most these practices labour-intensive expensive with limited benefits. Application plant-growth-promoting rhizobacteria (PGPR), however, proving be preferential strategy that encompasses many direct indirect PGPRs impart induced systemic tolerance (IST) towards through variety mechanisms improvement antioxidant system, production ACC-deaminase phytohormones, nitrogen fixation, phosphate solubilization, siderophore exopolysaccharides production, enhanced amplified rates carotenoid production. The commercial applicability biostimulants will still dependent selection performance robust strains various environmental

Language: Английский

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Efficiency of microbial bio-agents as elicitors in plant defense mechanism under biotic stress: A review

Current Research in Microbial Sciences, Journal Year: 2021, Volume and Issue: 2, P. 100054 - 100054

Published: Aug. 8, 2021

Numerous harmful microorganisms and insect pests have the ability to cause plant infections or damage, which is mostly controlled by toxic chemical agents. These compounds their derivatives exhibit hazardous effects on habitats human life too. Hence, there's a need develop novel, more effective safe bio-control A variety of microbes such as viruses, bacteria, fungi possess great potential fight against phytopathogens thus can be used agents instead compounds. naturally occurring are applied plants in order control phytopathogens. Moreover, practicing them appropriately for agriculture management way towards sustainable approach. The MBCAs follow various modes action act elicitors where they induce signal activate defense mechanisms pathogens. help disease suppression through production enzymes, antimicrobial compounds, antagonist activity involving hyper-parasitism, induced resistance, competitive inhibition, etc. Efficient recognition pathogens prompt defensive response key factors resistance plants. This phenomenon pertaining complex cascade that involves an increased amount proteins, salicylic acid (SA), induction signaling pathways dependent hormones. Although, dearth information about exact mechanism plant-induced studies conducted at physiological, biochemical genetic levels. tried explain series responses triggered may enhance capacity Several natural recombinant commercially available mainly include strains Bacillus, Pseudomonads Trichoderma. However, complete understanding microbial interactions cellular molecular levels will facilitate screening eco-friendly bio-agents, thereby increasing scope MBCAs. article comprehensive review highlights importance activation regulation

Language: Английский

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Insight into Recent Progress and Perspectives in Improvement of Antioxidant Machinery upon PGPR Augmentation in Plants under Drought Stress: A Review

Antioxidants, Journal Year: 2022, Volume and Issue: 11(9), P. 1763 - 1763

Published: Sept. 7, 2022

Agriculture has a lot of responsibility as the rise in world's population demands more food requirements. However, than one type biotic and abiotic stress continually impacts agricultural productivity. Drought is major that significantly affects productivity every year plants undergo several morphological, biochemical, physiological modifications, such repressed root shoot growth, reduced photosynthesis transpiration rate, excessive production reactive oxygen species (ROS), osmotic adjustments, modified leaf senescence regulating signaling pathways. Such modifications may permanently damage plants; therefore, mitigation strategies must be developed. The use drought resistant crop cultivars expensive labor-intensive with few advantages. exploiting plant growth promoting rhizobacteria (PGPR) proven alternative numerous direct indirect PGPR confers induced systemic tolerance (IST) mechanisms response to via multiple mechanisms, including alteration architecture, maintenance high relative water content, improvement phytohormones, exopolysaccharides, ACC deaminase, carotenoids volatiles, induction antioxidant defense system, stress-responsive gene expression. commercial application bioinoculants or biostimulants will remain contingent on robust strain selection performance under unfavorable environmental conditions. This review highlights possible by activating adaptive systems for enhancing improving overall yield.

Language: Английский

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Plant Growth-Promoting Bacteria (PGPB) with Biofilm-Forming Ability: A Multifaceted Agent for Sustainable Agriculture

Diversity, Journal Year: 2023, Volume and Issue: 15(1), P. 112 - 112

Published: Jan. 13, 2023

Plant growth-promoting bacteria (PGPB) enhance plant growth, as well protect plants from several biotic and abiotic stresses through a variety of mechanisms. Therefore, the exploitation PGPB in agriculture is feasible it offers sustainable eco-friendly approaches to maintaining soil health while increasing crop productivity. The vital key application its effectiveness colonizing roots phyllosphere, developing protective umbrella formation microcolonies biofilms. Biofilms offer benefits PGPB, such enhancing resistance adverse environmental conditions, protecting against pathogens, improving acquisition nutrients released environment, facilitating beneficial bacteria–plant interactions. bacterial biofilms can successfully compete with other microorganisms found on surfaces. In addition, plant-associated are capable colonization sites, cycling nutrients, pathogen defenses, tolerance stresses, thereby agricultural productivity yields. This review highlights role surfaces strategies used by biofilm-forming PGPB. Moreover, factors influencing biofilm at root shoot interfaces critically discussed. will pave formulations addressing challenges related their efficacy competence for sustainability.

Language: Английский

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Role of biostimulants in mitigating the effects of climate change on crop performance

Frontiers in Plant Science, Journal Year: 2022, Volume and Issue: 13

Published: Oct. 21, 2022

Climate change is a critical yield–limiting factor that has threatened the entire global crop production system in present scenario. The use of biostimulants agriculture shown tremendous potential combating climate change–induced stresses such as drought, salinity, temperature stress, etc. Biostimulants are organic compounds, microbes, or amalgamation both could regulate plant growth behavior through molecular alteration and physiological, biochemical, anatomical modulations. Their nature diverse due to varying composition bioactive they function various modes action. To generate successful biostimulatory action on crops under different parameters, multi– omics approach would be beneficial identify predict its outcome comprehensively. ‘ omics’ greatly helped us understand mode plants at cellular levels. acting messenger signal transduction resembling phytohormones other chemical compounds their cross–talk abiotic help design future management changing climate, thus, sustaining food security with finite natural resources. This review article elucidates strategic prospects mitigating adverse impacts harsh environmental conditions plants.

Language: Английский

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Bacillus spp. as Bioagents: Uses and Application for Sustainable Agriculture

Biology, Journal Year: 2022, Volume and Issue: 11(12), P. 1763 - 1763

Published: Dec. 5, 2022

Food security will be a substantial issue in the near future due to expeditiously growing global population. The current trend agriculture industry entails extravagant use of synthesized pesticides and fertilizers, making sustainability difficult challenge. Land degradation, lower production, vulnerability both abiotic biotic stresses are problems caused by usage these fertilizers. major goal sustainable is ameliorate productivity reduce pests disease prevalence such degree that prevents large-scale damage crops. Agriculture composite interrelation among plants, microbes, soil. Plant microbes play role growth promotion improve soil fertility as well. Bacillus spp. produces an extensive range bio-chemicals assist plant control, promote development, make them suitable for agricultural uses. support N fixation, P K solubilization, phytohormone synthesis, addition being most propitious biocontrol agent. Moreover, Bacilli excrete extracellular metabolites, including antibiotics, lytic enzymes, siderophores, demonstrate antagonistic activity against phytopathogens. boosts resistance toward pathogens inducing systemic (ISR). effective microbial insecticide insects thuringiensis (Bt). Additionally, incorporation toxin genes genetically modified crops increases pests. There constant increase identified species potential agents. they have been involved biosynthesis metallic nanoparticles. main objective this review article display uses application specie promising biopesticide agriculture. strains yield attributes could valuable developing novel formulations lead way

Language: Английский

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Role of elicitors to initiate the induction of systemic resistance in plants to biotic stress

Plant Stress, Journal Year: 2022, Volume and Issue: 5, P. 100103 - 100103

Published: June 30, 2022

Biotic stress affects crop yield and production. It is essential to acquire the knowledge necessary for designing resistance in host plants by understanding interaction between pathogens host. Salicylic acid jasmonic are principal regulators of interconnected signaling pathways plant defense mechanisms overcome conditions. Plants on pathogen attack experience transient increase reactive oxygen species production which turn activates local programmed cell death confers systemic resistance. Disease management largely done chemical compounds like fungicides, insecticides, herbicides. However, these chemicals hazardous environment living beings hence it search novel harmless means disease control. Elicitors molecules that initiate acquired or induced inducing expression pathogenesis-related genes protecting from diseases. This review discusses biotic stress, elicitors, elicitor-receptor mediated mechanism this context, attempts draw attention researchers find elicitors as control alternatives.

Language: Английский

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Biofortification of major crop plants with iron and zinc - achievements and future directions

Plant and Soil, Journal Year: 2022, Volume and Issue: 474(1-2), P. 57 - 76

Published: Feb. 17, 2022

Abstract Biofortification is a long-term strategy of delivering more iron (Fe) and zinc (Zn) to those most in need. Plant breeding programs within the CGIAR NARS have made major advances Fe- Zn-dense variety development there been successful releases new biofortified varieties. Recent research effort has led substantial improvement our knowledge Fe Zn homeostasis gene regulation, resulting identification candidate genes for marker assisted selection. International cooperation between agricultural nutrition community strengthened, with numerous implementation partnership strategies developed employed over years. The evidence on effectiveness crops slowly building up results are encouraging. continues be scaled out further work required reach general aim eradicating hidden hunger deficiency world’s population ensuring nutritional security.

Language: Английский

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Soil Microbiome: Diversity, Benefits and Interactions with Plants

Sustainability, Journal Year: 2023, Volume and Issue: 15(19), P. 14643 - 14643

Published: Oct. 9, 2023

Plant roots aid the growth and functions of several kinds microorganisms such as plant growth-promoting rhizobacteria, mycorrhizal fungi, endophytic bacteria, actinomycetes, nematodes, protozoans which may impart significant impacts on health growth. soil–microbe interaction is an intricate, continuous, dynamic process that occurs in a distinct zone known rhizosphere. Plants interact with these soil microbes variety ways, including competitive, exploitative, neutral, commensal, symbiotic relationships. Both types were found to have impact community diversity structure rhizosphere, or vice versa. The thought be essential for management quality because it has different biocontrol effects could very advantageous host alter physiology nutrition. composition microbial influenced by type. Besides beneficial microbes, also harbors are detrimental plants, competing nutrients space, causing diseases. Numerous antagonistic activity ability defend plants from soil-borne study microbiome formulating strategies transforming rhizosphere benefit plants. This review pays special emphasis populations how they influence growth, nutrient acquisition, inter-relationships between stress resistance, carbon sequestration, phytoremediation.

Language: Английский

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