Interactions in Soil-Microbe-Plant System: Adaptation to Stressed Agriculture

Shilev, Stefan; Azaizeh, Hassan; Vassilev, Nikolay; Georgiev, D.; Babrikova, Ivelina

doi:10.1007/978-981-13-8391-5_6

Cited by 15 publications

(19 citation statements)

References 261 publications

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“…In addition, halotolerant bacteria have built mechanisms to survive in salinity-rich environments. The main mechanisms are related to cell-wall construction and the capacity to pump ions out of the cell, as follows: (i) generation of extracellular polymeric substances (EPSs) that support biofilm formation, limiting the salt import into the cell [14,37,51]; (ii) soluble salt production through protein and enzyme adaptation [5]; (iii) optimizing the intracellular concentration of Na + ions using the Na + /H + antiporter of the cell membrane [51][52][53]-the vital function of this "pump" is to maintain the elevated values of the K + /Na + ratio in the cytosol compared to the low value in the surrounded habitat; (iv) avoiding the entry of high salt concentrations through the cell membrane because of the specific structure of the cell wall (structural and integral proteins, lipid composition, polysaccharides, between others) [15,52,53]; (v) endogenous synthesis of amino acids and solutes [37,51,54].…”

Section: Bacteria and Salinity Stressmentioning

confidence: 99%

“…Some PGPB are able to alleviate the negative effects on plants caused by salinity [4,11,27,36,38,[54][55][56]. There is evidence of the application of these mechanisms to promote growth and enhance the salinity tolerance of plants (Table 1), and, in most cases, more than one mechanism is involved.…”

Section: Role Of Pgpb In Alleviating Salinity Stress To Plantsmentioning

confidence: 99%

“…Soil salinity causes a reduction of essential nutrient uptake because of ion toxicity and osmotic pressure. There are micronutrients that are essential for the plants, although they are needed in small quantities [37,54,89]. These microelements, such as copper, zinc, iron, magnesium, sulfur, an molybdenum, are very important as they participate in the composition of various proteins, DNA, enzymes (nitrate reductase, catalases, hydrogenases), amino acids (methionine, tryptophan, threonine), and photosynthetic processes [89].…”

Section: Pgpb Support Nutrient Acquisition In Plantsmentioning

confidence: 99%

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Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants

Shilev

2020

Applied Sciences

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Soil deterioration has led to problems with the nutrition of the world’s population. As one of the most serious stressors, soil salinization has a negative effect on the quantity and quality of agricultural production, drawing attention to the need for environmentally friendly technologies to overcome the adverse effects. The use of plant-growth-promoting bacteria (PGPB) can be a key factor in reducing salinity stress in plants as they are already introduced in practice. Plants having halotolerant PGPB in their root surroundings improve in diverse morphological, physiological, and biochemical aspects due to their multiple plant-growth-promoting traits. These beneficial effects are related to the excretion of bacterial phytohormones and modulation of their expression, improvement of the availability of soil nutrients, and the release of organic compounds that modify plant rhizosphere and function as signaling molecules, thus contributing to the plant’s salinity tolerance. This review aims to elucidate mechanisms by which PGPB are able to increase plant tolerance under soil salinity.

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Section: Bacteria and Salinity Stressmentioning

confidence: 99%

Section: Role Of Pgpb In Alleviating Salinity Stress To Plantsmentioning

confidence: 99%

Section: Pgpb Support Nutrient Acquisition In Plantsmentioning

confidence: 99%

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Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants

Shilev

2020

Applied Sciences

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“…Different groups of soil microorganisms, such as root endophytic fungi, mycorrhizal fungi, plant growth-promoting rhizobacteria, rhizobia, and phosphate solubilizers affect plant growth through direct and plant-mediated mechanisms, including in stressed conditions (van der Heijden et al, 2008;Berg, 2009;Shilev et al, 2019). The application of selected plant beneficial microorganisms individually or as microbial consortia with multifunctional properties is an important tool to promote crop health and productivity (Ahmad et al, 2018;Maron et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Formulation of Microbial Inoculants by Encapsulation in Natural Polysaccharides: Focus on Beneficial Properties of Carrier Additives and Derivatives

et al. 2020

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In the last 10-15 years, the wide application of bioformulated plant beneficial microorganisms is accepted as an effective alternative of chemical agro-products. Two main problems can be distinguished in their production and application: (a) economical competiveness based on the overall upstream and downstream operational costs, and (b) development of commercial products with a high soil-plant colonization potential in controlled conditions but not able to effectively mobilize soil nutrients and/or combat plant pathogens in the field. To solve the above problems, microbe-based formulations produced by immobilization methods are gaining attention as they demonstrate a large number of advantages compared to other solid and liquid formulations. This mini-review summarizes the knowledge of additional compounds that form part of the bioformulations. The additives can exert economical, price-decreasing effects as bulking agents or direct effects improving microbial survival during storage and after introduction into soil with simultaneous beneficial effects on soil and plants. In some studies, combinations of additives are used with a complex impact, which improves the overall characteristics of the final products. Special attention is paid to polysaccharide carriers and their derivates, which play stimulatory role on plants but are less studied. The mini-review also focuses on the potential difficulty in evaluating the effects of complex bio-formulations.

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“…In addition, an increasing number of stress factors are observed such as salinity, alkalinity/acidity, contamination, nutrient deficiency or overload of chemical fertilizers, drought, soil erosion due to climate change, and various biotic factors (Fitzpatrick et al, 2019). The use of plant beneficial microorganisms (PBM) to mitigate these 0problems in cultivated crop production is now a common practice particularly in the modern, sustainable agriculture and in the context of increasing world population and environmental and climate concerns (Shilev et al, 2019). During the last 20-30 years, a large number of microorganisms have been isolated, characterized and tested as biofertilizers and biocontrol agents in controlled and natural conditions.…”

Section: Introductionmentioning

confidence: 99%