Exopolysaccharides and Biofilms in Mitigating Salinity Stress: The Biotechnological Potential of Halophilic and Soil-Inhabiting PGPR Microorganisms

Banerjee, Aparna; Sarkar, Shrabana; Cuadros-Orellana, Sara; Bandopadhyay, Rajib

doi:10.1007/978-3-030-18975-4_6

Cited by 32 publications

(20 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In accordance with our findings, Halomonas and Pseudomonas, two of the most abundant genera found, are reported as two of the three most commonly found genera in roots and rhizosphere of halophytes in extreme environments (Albdaiwi et al, 2019;Alexander et al, 2019;Kearl et al, 2019). However, Kushneria, Pseudarthrobacter, and Planomicrobium are less common, the last being not frequently reported as a PGP strain (Alexander et al, 2019;Banerjee et al, 2019;Mukhtar et al, 2019;Panda and Parida, 2019).…”

Section: Discussionsupporting

confidence: 91%

“…Many authors have described the use of bacteria isolated from hypersaline environments, particularly from the rhizosphere of halotolerant plants located in saline deserts, hypersaline soils, and salt-affected areas, as growth promoters in traditional crops (Sáenz-Mata et al, 2016;Mukhtar et al, 2019;Wu et al, 2019;Kumawat et al, 2021). Thus, rhizosphere microbiomes play an essential role in the survival of plants in nature, and growthpromoting rhizobacteria isolated from salt-tolerant plants could be crucial for alleviating soil salinity stress during plant growth (Banerjee et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Amelioration of Saline Stress on Chia (Salvia hispanica L.) Seedlings Inoculated With Halotolerant Plant Growth-Promoting Bacteria Isolated From Hypersaline Environments

et al. 2021

View full text Add to dashboard Cite

The rhizosphere and microbiome of halotolerant plants could be crucial for alleviating salinity stress during plant growth. The aims of this work were (1) to isolate bacteria from rhizosphere and bulk soil samples from the Salar del Hombre Muerto (Catamarca, Argentina), (2) to characterize different plant growth-promoting (PGP) activities produced by these bacterial isolates, and (3) to evaluate their effect on the initial growth of chia (Salvia hispanica L.) under saline stress. A total of 667 microorganisms were isolated, using different culture media with NaCl, and their abilities for nitrogen fixation, phosphate solubilization, siderophores production, and indole-3-acetic acid production were evaluated. Thirteen strains were selected for showing all the tested PGP activities; they belonged to the genera Kushneria, Halomonass, Pseudomonas, Planomicrobium, and Pseudarthrobacter. The strains Kushneria sp. and Halomonas sp. showed the highest salinity tolerance (from 50 to 2,000 mM NaCl) and biomass and biofilm production. Chia seeds were treated with six of the first 13 selected strains to evaluate their plant growth-promoting effect under saline stress (without and with 50 and 100 mM NaCl). Halomonas sp. 3R.12 and Kushneria sp. T3.7 produced heavier seedlings with a balanced shoot/root length ratio, while Pseudomonas sp. AN23 showed the best effect upon chia seedlings, with a morphological response similar to non-stressed seedlings. On the other hand, seedlings displayed no responses when inoculated with Planomicrobium sp. 3S.31 and Pseudarthrobacter sp. ER25. This study contributes to the knowledge on microorganisms from hypersaline environments as plant growth promoters for their use in the production of salt-sensitive crops, among other potential uses.

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Amelioration of Saline Stress on Chia (Salvia hispanica L.) Seedlings Inoculated With Halotolerant Plant Growth-Promoting Bacteria Isolated From Hypersaline Environments

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Increased exopolysaccharides generation in response to salt stress favors biofilm formation [211,212], contributing towards plant adaptation to salinity [213]. In addition, biofilms are formed on specific surfaces, such as roots and soil particles, contributing to reinforce soil structure and physicochemical characteristics [214,215]. The fact that Pseudomonas anguilliseptica SAW 24 exhibited the maximum PGPB effectiveness at its maximum biofilm formation capacity confirms the relation between biofilm formation and PGPB effectiveness under saline and non-saline conditions [215].…”

Section: Exopolysaccharides and Biofilm Formationmentioning

confidence: 82%

“…In addition, biofilms are formed on specific surfaces, such as roots and soil particles, contributing to reinforce soil structure and physicochemical characteristics [214,215]. The fact that Pseudomonas anguilliseptica SAW 24 exhibited the maximum PGPB effectiveness at its maximum biofilm formation capacity confirms the relation between biofilm formation and PGPB effectiveness under saline and non-saline conditions [215]. Halophilic microorganisms can form biofilm and accumulate EPS at increasing salt stress.…”

Section: Exopolysaccharides and Biofilm Formationmentioning

confidence: 90%

Current Advances in Plant Growth Promoting Bacteria Alleviating Salt Stress for Sustainable Agriculture

2020

View full text Add to dashboard Cite

Humanity in the modern world is confronted with diverse problems at several levels. The environmental concern is probably the most important as it threatens different ecosystems, food, and farming as well as humans, animals, and plants. More specifically, salinization of agricultural soils is a global concern because of on one side, the permanent increase of the areas affected, and on the other side, the disastrous damage caused to various plants affecting hugely crop productivity and yields. Currently, great attention is directed towards the use of Plant Growth Promoting Bacteria (PGPB). This alternative method, which is healthy, safe, and ecological, seems to be very promising in terms of simultaneous salinity alleviation and improving crop productivity. This review attempts to deal with different aspects of the current advances concerning the use of PGPBs for saline stress alleviation. The objective is to explain, discuss, and present the current progress in this area of research. We firstly discuss the implication of PGPB on soil desalinization. We present the impacts of salinity on crops. We look for the different salinity origin and its impacts on plants. We discuss the impacts of salinity on soil. Then, we review various recent progress of hemophilic PGPB for sustainable agriculture. We categorize the mechanisms of PGPB toward salinity tolerance. We discuss the use of PGPB inoculants under salinity that can reduce chemical fertilization. Finally, we present some possible directions for future investigation. It seems that PGPBs use for saline stress alleviation gain more importance, investigations, and applications. Regarding the complexity of the mechanisms implicated in this domain, various aspects remain to be elucidated.

show abstract

“…Previous studies showed that in addition to suppression of seedling disease, PGPR contribute to growth promotion and salt stress tolerance directly and indirectly via the production of bioactive compounds and modifications to the rhizosphere environment via extensive biofilm formation, respectively ( Yang et al, 2009 ). For example, PGPR are known to enhance germination rates, improve nutrient status, and alleviate salt stress in wheat seedlings via the production of: indole acetic acid (IAA), which mediates lateral branching, resulting in increased fine root length, surface area, tip number, and water and primary nutrient uptake ( Ramadoss et al, 2013 ; Egamberdieva et al, 2015 ); the enzyme 1-aminocyclopropane-1-carboxylate (ACC)-deaminase, involved in the degradation of the ethylene precursor ACC, resulting in improved root growth and stress tolerance ( Bal et al, 2013 ); antioxidant enzymes such as catalase involved in ROS degradation and management of redox stress ( Jha and Subramanian, 2014 ); siderophores and phosphate solubilizing compounds and other undetermined traits important for improved nutritional status ( Nadeem et al, 2014 ; Rajkumar et al, 2017 ); and EPS matrix, which helps improve soil structure, increase soil water retention, and reduce the available Na + ( Naseem and Bano, 2014 ; Banerjee et al, 2019 ). P. chlororaphis 30-84 (including 30-84ZN) produces some of these bioactive compounds, including IAA, ACC-deaminase, pyoverdine class siderophores, and antioxidants ( Mahmoudi et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Phenazine-Producing Rhizobacteria Promote Plant Growth and Reduce Redox and Osmotic Stress in Wheat Seedlings Under Saline Conditions

et al. 2020

View full text Add to dashboard Cite

Application of plant growth promoting bacteria may induce plant salt stress tolerance, however the underpinning microbial and plant mechanisms remain poorly understood. In the present study, the specific role of phenazine production by rhizosphere-colonizing Pseudomonas in mediating the inhibitory effects of salinity on wheat seed germination and seedling growth in four different varieties was investigated using Pseudomonas chlororaphis 30-84 (wild type) and isogenic derivatives deficient or enhanced in phenazine production. The results showed that varieties differed in how they responded to the salt stress treatment and the benefits derived from colonization by P. chlororaphis 30-84. In all varieties, the salt stress treatment significantly reduced seed germination, and in seedlings, reduced relative water content, increased reactive oxygen species (ROS) levels in leaves, and in three of four varieties, reduced shoot and root production compared to the no salt stress treatment. Inoculation of seeds with Pseudomonas chlororaphis 30-84 wild type or derivatives promoted salt-stress tolerance in seedlings of the four commercial winter wheat varieties tested, but the salt-stress tolerance phenotype was not entirely due to phenazine production. For example, all P. chlororaphis derivatives (including the phenazine-producing mutant) significantly improved relative water content in two varieties, Iba and CV 1, for which the salt stress treatment had a large impact. Importantly, all P. chlororaphis derivatives enabled the salt inhibited wheat varieties studied to maintain above ground productivity in saline conditions. However, only phenazine-producing derivatives enhanced the shoot or root growth of seedlings of all varieties under nonsaline conditions. Notably, ROS accumulation was reduced, and antioxidant enzyme (catalase) activity enhanced in the leaves of seedlings grown in saline conditions that were seed-treated with phenazine-producing P. chlororaphis derivatives as compared to noninoculated seedlings. The results demonstrate the capacity of P. chlororaphis to improve salt tolerance in wheat seedlings by promoting plant growth and reducing osmotic stress and a role for bacterial phenazine production in reducing redox stress.

show abstract

Exopolysaccharides and Biofilms in Mitigating Salinity Stress: The Biotechnological Potential of Halophilic and Soil-Inhabiting PGPR Microorganisms

Cited by 32 publications

References 61 publications

Amelioration of Saline Stress on Chia (Salvia hispanica L.) Seedlings Inoculated With Halotolerant Plant Growth-Promoting Bacteria Isolated From Hypersaline Environments

Amelioration of Saline Stress on Chia (Salvia hispanica L.) Seedlings Inoculated With Halotolerant Plant Growth-Promoting Bacteria Isolated From Hypersaline Environments

Current Advances in Plant Growth Promoting Bacteria Alleviating Salt Stress for Sustainable Agriculture

Phenazine-Producing Rhizobacteria Promote Plant Growth and Reduce Redox and Osmotic Stress in Wheat Seedlings Under Saline Conditions

Contact Info

Product

Resources

About