Unlocking the potential of plant growth-promoting rhizobacteria on soil health and the sustainability of agricultural systems

Khatoon, Zobia; Huang, Suiliang; Rafique, Mazhar; Fakhar, Ali; Kamran, Muhammad; Santoyo, Gustavo

doi:10.1016/j.jenvman.2020.111118

Cited by 222 publications

(117 citation statements)

References 295 publications

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“…Agrochemicals runoffs from such land adversely affect life on Earth through bioaccumulation and biomagnifications through the food chain. Also, the pesticides utilized to fight against plant illness affect the beneficial natural insect, soil fertility and soil microbiota adversely (Khatoon et al, 2020), and obviously additionally impact human well-being. Alongside, the soil acidity due to these strong chemicals is also altered (Slepetiene et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Insight Into the Role of PGPR in Sustainable Agriculture and Environment

Mohanty

Singh

Chakraborty

et al. 2021

Front. Sustain. Food Syst.

148

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A multitude of roles is played by microbes in food and agriculture that include nutrient cycling and management, organic matter decomposition and fermentation. Plant growth promoting rhizobacteria (PGPR), representing microbial groups and with ability of colonizing plant roots, influence plant growth through various indirect and direct modes in order to promote its growth and/or protect it from diseases or damage due to insect attack. Thus, PGPR research has received renewed interest worldwide. Increasing number of crop-specific PGPR are being commercialized these days. Approaches like seed-inoculation and soil application either alone or in combination with bacterial culture/product for increased nutrient availability through phosphate solubilisation, potassium solubilisation, sulfur oxidation, nitrogen fixation, iron, and copper chelation are gaining popularity. Arbuscular mycorrhizal fungi (AMF) are root fungal symbiont that improve management of abiotic stress such as phosphorus deficiency. PGPR involves roles like production of indole acetic acid (IAA), ammonia (NH3), hydrogen cyanide (HCN), catalase, etc. PGPR also improve nutrient uptake by altering the level of plant hormone that enhances root surface area by increasing its girth and shape, thereby helping in absorbing more nutrients. PGPR facilitate seed germination, seedling growth and crop yield. An array of microbes including Pseudomonas, Azospirillum, Azotobacter, Klebsiella, Enterobacter, Alcaligenes, Arthrobacter, Burkholderia, Bacillus, and Serratia enhance plant growth. Various Pseudomonas sp. have demonstrated significant increase in germination, seedling growth and yield in different agricultural crops, including wheat. Hence, developing a successful crop-specific PGPR formulation, the candidate should possess characteristics like high rhizosphere competence, extensive competitive saprophytic ability, growth enhancing ability, ease of mass production, broad-spectrum action, safety toward the environment and compatibility with other partnering organisms.

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Section: Introductionmentioning

confidence: 99%

Insight Into the Role of PGPR in Sustainable Agriculture and Environment

Mohanty

Singh

Chakraborty

et al. 2021

Front. Sustain. Food Syst.

148

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“…For this reason, amending the soil with such organic fertilizers as compost or manure contributes to higher microbial diversity and biomass compared to mineral-fertilized soils, which in turn positively impacts soil health ( Schmid et al, 2018 ; Banerjee et al, 2019 ). Unfortunately, only a few agroecosystem experiments exist that compare organic and conventional management strategies over an extended period for evaluation of impact on soil health and restoration ( Raupp et al, 2006 ; Khatoon et al, 2020 ). Hartmann et al (2015) took a metagenomics approach to assess microbial diversity of soil in response to more than 20 years of continuous organic and conventional farming.…”

Section: Principles and Management Of Rhizosphere Microbiomes For Susmentioning

confidence: 99%

Microbe to Microbiome: A Paradigm Shift in the Application of Microorganisms for Sustainable Agriculture

et al. 2020

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Light, water and healthy soil are three essential natural resources required for agricultural productivity. Industrialization of agriculture has resulted in intensification of cropping practices using enormous amounts of chemical pesticides and fertilizers that damage these natural resources. Therefore, there is a need to embrace agriculture practices that do not depend on greater use of fertilizers and water to meet the growing demand of global food requirements. Plants and soil harbor millions of microorganisms, which collectively form a microbial community known as the microbiome. An effective microbiome can offer benefits to its host, including plant growth promotion, nutrient use efficiency, and control of pests and phytopathogens. Therefore, there is an immediate need to bring functional potential of plant-associated microbiome and its innovation into crop production. In addition to that, new scientific methodologies that can track the nutrient flux through the plant, its resident microbiome and surrounding soil, will offer new opportunities for the design of more efficient microbial consortia design. It is now increasingly acknowledged that the diversity of a microbial inoculum is as important as its plant growth promoting ability. Not surprisingly, outcomes from such plant and soil microbiome studies have resulted in a paradigm shift away from single, specific soil microbes to a more holistic microbiome approach for enhancing crop productivity and the restoration of soil health. Herein, we have reviewed this paradigm shift and discussed various aspects of benign microbiome-based approaches for sustainable agriculture.

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“…Direct mechanisms include improving the availability of nutrients in the soil through the solubilization of minerals like phosphorus, potassium, and zinc or the production of phytohormones like indole-acetic acid, gibberellins, and ethylene. Indirect mechanisms involve disease reduction through antibiotic and siderophore production, competition for nutrients or space, and stimulation of resistance mechanisms [4][5][6]. Because of these properties, PGPR are an alternative for use in agriculture as biofertilizers and biological control agents, and their application has been shown to reduce the use of chemicals and minimize soil, air, and water pollution [7].…”

Section: Introductionmentioning

confidence: 99%

Rhizobacteria Associated with a Native Solanaceae Promote Plant Growth and Decrease the Effects of Fusariumoxysporum in Tomato

2021

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Plant growth-promoting rhizobacteria are often utilized to improve crop health and productivity. Nevertheless, their positive effects can be hindered if they fail to withstand the environmental and ecological conditions of the regions where they are applied. An alternative approach to circumvent this problem is a tailored selection of bacteria for specific agricultural systems. In this work, we evaluated the plant growth promoting and pathogen inhibition activity of rhizobacteria obtained from the rhizosphere of Mariola (Solanum hindsianum), an endemic shrub from Baja California. Eight strains were capable of inhibiting Fusarium oxysporum in vitro, and thirteen strains were found to possess three or more plant-growth-promotion traits. Molecular identification of these strains, using 16 s rRNA partial sequences, identified them as belonging to the genera Arthrobacter, Bacillus, Paenibacillus, Pseudomonas, and Streptomyces. Finally, the effect of selected plant growth-promoting rhizobacteria (PGPR) strains on the growth and suppression of Fusarium wilt in tomato was evaluated. Results showed that these strains improved tomato plants growth under greenhouse conditions and reduced Fusarium wilt effects, as reflected in several variables such as length and weight of roots and stem. This work highlights the potential of native plants related to regionally important crops as a valuable source of beneficial bacteria.

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Unlocking the potential of plant growth-promoting rhizobacteria on soil health and the sustainability of agricultural systems

Cited by 222 publications

References 295 publications

Insight Into the Role of PGPR in Sustainable Agriculture and Environment

Insight Into the Role of PGPR in Sustainable Agriculture and Environment

Microbe to Microbiome: A Paradigm Shift in the Application of Microorganisms for Sustainable Agriculture

Rhizobacteria Associated with a Native Solanaceae Promote Plant Growth and Decrease the Effects of Fusariumoxysporum in Tomato

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