scholarly journals Halotolerant Rhizobacteria for Salinity-Stress Mitigation: Diversity, Mechanisms and Molecular Approaches

2022 ◽  
Vol 14 (1) ◽  
pp. 490
Author(s):  
Alka Sagar ◽  
Shalini Rai ◽  
Noshin Ilyas ◽  
R. Z. Sayyed ◽  
Ahmad I. Al-Turki ◽  
...  
Keyword(s):  
Plant Growth ◽  
Salinity Stress ◽  
Crop Production ◽  
Germination Rate ◽  
Soil Nutrient ◽  
Nutrient Content ◽  
Shoot Elongation ◽  
Plant Growth Promoting Bacteria ◽  
Molecular Approaches ◽  
Plant Growth Promoting

Agriculture is the best foundation for human livelihoods, and, in this respect, crop production has been forced to adopt sustainable farming practices. However, soil salinity severely affects crop growth, the degradation of soil quality, and fertility in many countries of the world. This results in the loss of profitability, the growth of agricultural yields, and the step-by-step decline of the soil nutrient content. Thus, researchers have focused on searching for halotolerant and plant growth-promoting bacteria (PGPB) to increase soil fertility and productivity. The beneficial bacteria are frequently connected with the plant rhizosphere and can alleviate plant growth under salinity stress through direct or indirect mechanisms. In this context, PGPB have attained a unique position. The responses include an increased rate of photosynthesis, high production of antioxidants, osmolyte accumulation, decreased Na+ ions, maintenance of the water balance, a high germination rate, and well-developed root and shoot elongation under salt-stress conditions. Therefore, the use of PGPB as bioformulations under salinity stress has been an emerging research avenue for the last few years, and applications of biopesticides and biofertilizers are being considered as alternative tools for sustainable agriculture, as they are ecofriendly and minimize all kinds of stresses. Halotolerant PGPB possess greater potential for use in salinity-affected soil as sustainable bioinoculants and for the bioremediation of salt-affected soil.

Interactive effect of biochar and plant growth-promoting bacterial endophytes on ameliorating salinity stress in maize

2015 ◽  
Vol 42 (8) ◽  
pp. 770 ◽  
Author(s):  
Saqib Saleem Akhtar ◽  
Mathias Neumann Andersen ◽  
Muhammad Naveed ◽  
Zahir Ahmad Zahir ◽  
Fulai Liu
Keyword(s):  
Plant Growth ◽  
Salinity Stress ◽  
Crop Production ◽  
Interactive Effect ◽  
Nutrient Balance ◽  
Bacterial Strains ◽  
Negative Effects ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Salt Affected Soils

The objective of this work was to study the interactive effect of biochar and plant growth-promoting endophytic bacteria containing 1-aminocyclopropane-1-carboxylate deaminase and exopolysaccharide activity on mitigating salinity stress in maize (Zea mays L.). The plants were grown in a greenhouse under controlled conditions, and were subjected to separate or combined treatments of biochar (0% and 5%, w/w) and two endophytic bacterial strains (Burkholderia phytofirmans (PsJN) and Enterobacter sp. (FD17)) and salinity stress. The results indicated that salinity significantly decreased the growth of maize, whereas both biochar and inoculation mitigated the negative effects of salinity on maize performance either by decreasing the xylem Na+ concentration ([Na+]xylem) uptake or by maintaining nutrient balance within the plant, especially when the two treatments were applied in combination. Moreover, in biochar-amended saline soil, strain FD17 performed significantly better than did PsJN in reducing [Na+]xylem. Our results suggested that inoculation of plants with endophytic baterial strains along with biochar amendment could be an effective approach for sustaining crop production in salt-affected soils.

scholarly journals Genomic Mining and Physiological Characterization of new Halophilic Plant Growth Promoting Bacilli

2021 ◽  
Author(s):  
Claudia Petrillo ◽  
Stefany Castaldi ◽  
Mariamichela Lanzilli ◽  
Matteo Selci ◽  
Angelina Cordone ◽  
...  
Keyword(s):  
Plant Growth ◽  
Crop Production ◽  
Growth Promotion ◽  
Biological Activities ◽  
Gene Clusters ◽  
Plant Growth Promoting Bacteria ◽  
Dual Culture ◽  
Whole Genome Analysis ◽  
Plant Growth Promoting ◽  
Growth Promoting

Massive application of chemical fertilizers and pesticides has been the main strategy used to cope with the rising crop demands in the last decades. The indiscriminate use of chemicals while providing a temporary solution has led to a decrease in crop productivity and an increase in the environmental impact of modern agriculture. A sustainable alternative to the use of chemicals for crop production is the use of microorganisms naturally capable of enhancing plant growth and protecting crops from pests, known as Plant-Growth-Promoting Bacteria (PGPB). The aim of the present study was to isolate and characterize PGPB from salt-pans sand samples able to ameliorate plant fitness. To survive high salinity, salt-tolerant microbes produce a broad range of compounds with heterogeneous biological activities that are potentially beneficial for plant growth. We have isolated and screened in vitro a total of 20 halophilic spore-forming bacteria for phyto-beneficial traits and compared the results with two rhizosphere Bacilli recently isolated from the rhizosphere of the same collection site and recently characterized as potential biocontrol agents. Whole-genome analysis on five selected halophilic strains confirmed the presence of numerous gene clusters with PGP and biocontrol functions and of novel secondary-metabolite biosynthetic genes potentially involved in plant growth promotion and protection. The predicted biocontrol potential was confirmed in dual culture assays against several phytopathogenic fungi and bacteria. Interestingly, the absence of predicted gene clusters with known biocontrol functions in some of the isolates was not predictive of the in vivo results, supporting the need of combining laboratory assays and genome mining in PGPB identification for future applications.

scholarly journals The role of Plant Growth Promoting Bacteria in improving nitrogen use efficiency for sustainable crop production: a focus on wheat

2017 ◽  
Vol 3 (3) ◽  
pp. 413-434 ◽  
Author(s):  
Nilde Antonella Di Benedetto ◽  
◽  
Maria Rosaria Corbo ◽  
Daniela Campaniello ◽  
Mariagrazia Pia Cataldi ◽  
...  
Keyword(s):  
Plant Growth ◽  
Nitrogen Use Efficiency ◽  
Crop Production ◽  
Plant Growth Promoting Bacteria ◽  
Nitrogen Use ◽  
Sustainable Crop Production ◽  
Plant Growth Promoting ◽  
Use Efficiency ◽  
Growth Promoting

scholarly journals Micro-remediation of chromium contaminated soils

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e6076 ◽  
Author(s):  
Hadia -e- Fatima ◽  
Ambreen Ahmed
Keyword(s):  
Plant Growth ◽  
Contaminated Soils ◽  
Crop Production ◽  
Lens Culinaris ◽  
Production Plant ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Strains ◽  
Soil Release ◽  
Plant Growth Promoting ◽  
Growth Promoting

Bacteria are tiny organisms which are ubiquitously found in the environment. These microscopic living bodies are responsible for the flow of nutrients in biogeochemical cycles and fertility imparted to the soil. Release of excessive chromium in agricultural soils due to rapid growth of industries may result in minimizing the fertility of soil in future, which will lead to reduction in crop production. Plant growth promoting bacteria (PGPB) are beneficial to the environment, some of which can tolerate chromium and protect plants against heavy metal stress. The current study aims to identify such chromium-tolerant auxin-producing rhizobacteria and to investigate their inoculation effects on the growth characteristics of Lens culinaris in chromium polluted soils by using two different chromium salts i.e., K2Cr2O7 and K2CrO4 in varying concentrations (0, 50, 100, 200, 400 and 500 µgml−1). The results revealed that Bacillus species are efficient in significantly reducing the deleterious effects of Cr. These effective bacterial strains were able to stimulate the growth of metal effected plants of Lens culinaris which were grown in chromium contaminated environment. Therefore, these plant growth promoting rhizobacteria PGPRs, having both auxin production potential and chromium-resistance ability, are considered as efficient micro-factories against chromium pollution.

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

2020 ◽  
Vol 10 (20) ◽  
pp. 7326
Author(s):  
Stefan Shilev
Keyword(s):  
Plant Growth ◽  
Salinity Stress ◽  
Soil Salinity ◽  
Soil Salinization ◽  
Plant Growth Promoting Bacteria ◽  
Plant Tolerance ◽  
Beneficial Effects ◽  
Negative Effect ◽  
Plant Growth Promoting ◽  
Growth Promoting

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.

Potential application of plant growth promoting bacteria in bioenergy crop production

2021 ◽  
pp. 109-123
Author(s):  
Chuansheng Mei ◽  
Sajeewa Amaradasa ◽  
Masoumeh Sikaroodi ◽  
Xunzhong Zhang ◽  
Patrick Gillevet ◽  
...  
Keyword(s):  
Plant Growth ◽  
Potential Application ◽  
Crop Production ◽  
Plant Growth Promoting Bacteria ◽  
Bioenergy Crop ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Rhizobacteria Isolated from Saline Soil Induce Systemic Tolerance in Wheat (Triticum aestivum L.) against Salinity Stress

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 989 ◽  
Author(s):  
Noshin Ilyas ◽  
Roomina Mazhar ◽  
Humaira Yasmin ◽  
Wajiha Khan ◽  
Sumera Iqbal ◽  
...  
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Salinity Stress ◽  
Plant Biomass ◽  
Growth Promotion ◽  
Soluble Sugar ◽  
Wheat Crop ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting

Halo-tolerant plant growth-promoting rhizobacteria (PGPR) have the inherent potential to cope up with salinity. Thus, they can be used as an effective strategy in enhancing the productivity of saline agro-systems. In this study, a total of 50 isolates were screened from the rhizospheric soil of plants growing in the salt range of Pakistan. Out of these, four isolates were selected based on their salinity tolerance and plant growth promotion characters. These isolates (SR1. SR2, SR3, and SR4) were identified as Bacillus sp. (KF719179), Azospirillum brasilense (KJ194586), Azospirillum lipoferum (KJ434039), and Pseudomonas stutzeri (KJ685889) by 16S rDNA gene sequence analysis. In vitro, these strains, in alone and in a consortium, showed better production of compatible solute and phytohormones, including indole acetic acid (IAA), gibberellic acid (GA), cytokinin (CK), and abscisic acid (ABA), in culture conditions under salt stress. When tested for inoculation, the consortium of all four strains showed the best results in terms of improved plant biomass and relative water content. Consortium-inoculated wheat plants showed tolerance by reduced electrolyte leakage and increased production of chlorophyll a, b, and total chlorophyll, and osmolytes, including soluble sugar, proline, amino acids, and antioxidant enzymes (superoxide dismutase, catalase, peroxidase), upon exposure to salinity stress (150 mM NaCl). In conclusion, plant growth-promoting bacteria, isolated from salt-affected regions, have strong potential to mitigate the deleterious effects of salt stress in wheat crop, when inoculated. Therefore, this consortium can be used as potent inoculants for wheat crop under prevailing stress conditions.

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