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

Sustainability, Год журнала: 2022, Номер 14(1), С. 490 - 490

Опубликована: Янв. 3, 2022

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

Язык: Английский

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Improved chromium tolerance of Medicago sativa by plant growth-promoting rhizobacteria (PGPR)

Journal of Genetic Engineering and Biotechnology, Год журнала: 2021, Номер 19(1), С. 149 - 149

Опубликована: Окт. 7, 2021

Soil pollution by heavy metals increases the bioavailability of like hexavalent chromium (Cr (VI)), subsequently limiting plant growth and reducing efficiency phytoremediation. Plant growth-promoting rhizobacteria (PGPR) have substantial potential to enhance as well tolerance metal stress. The aim this research was investigate Cr (VI) phytoremediation enhancement PGPR.The results showed that 27 rhizobacterial isolates studied were confirmed (VI)-resistant PGPR, using classical biochemical tests (phosphate solubilization, nitrogen fixation, indole acetic acid, exopolysaccharides, hydrogen cyanide, siderophores, ammonia, cellulase, pectinase, chitinase production) variable levels resistance (300-600 mg/L). best four selected PGPR (NT15, NT19, NT20, NT27) retained most PGP traits in presence 100-200 mg/L concentrations (VI). inoculation Medicago sativa with any these improved shoot root dry weight. NT27 isolate identified 16S rDNA gene sequence analyses a strain Pseudomonas sp. effective terms promotion stress level decrease. It increased weights M. 97.6 95.4%, respectively, when compared non-inoculated control plants. also greatly chlorophyll content decreased markers, malondialdehyde, peroxide, proline. effect on bioaccumulation factor (BAF) shoots roots plants increase biomass concomitantly concentration inoculated This would lead higher phytostabilization.This study demonstrates association sativa-Pseudomonas may be an efficient biological system for bioremediation (VI)-contaminated soils.

Язык: Английский

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Photosynthetic performance and nutrient uptake under salt stress: Differential responses of wheat plants to contrasting phosphorus forms and rates

Frontiers in Plant Science, Год журнала: 2022, Номер 13

Опубликована: Ноя. 10, 2022

Salt stress impacts phosphorus (P) bioavailability, mobility, and its uptake by plants. Since P is involved in many key processes plants, salinity deficiency could significantly cause serious damage to photosynthesis, the most essential physiological process for growth development of all green Different approaches have been proposed adopted minimize harmful effects their combined effect. Optimising nutrition seems bring positive results improve photosynthetic efficiency nutrient uptake. The present work posed question if soluble fertilizers allow wheat plants counter adverse effect salt stress. A pot experiment was performed using a Moroccan cultivar durum wheat: Karim. This study focused on different responses grown under P-availability. Two Orthophosphates (Ortho-A & Ortho-B) one polyphosphate (Poly-B) were applied at levels (0, 30 45 ppm). Plant analysed some parameters (stomatal conductance (SC), chlorophyll content index (CCI), fluorescence, shoot root biomass, mineral uptake). Fertilized showed significant increase performance Compared salt-stressed unfertilized (C+), CCI increased 93%, 81% 71% ppm fertilized Poly-B, Ortho-B Ortho-A, respectively. highest SC obtained fertilizer with an 232% followed 217% 157% both Poly-B Photosynthetic (PItot) also 128.5%, 90.2% 38.8% Ortho-B, Ortho-A Poly B, In addition, enhancement roots shoots biomass (49.4% 156.8%, respectively) compared C+. absorbed more phosphorus. mainly P. Positive correlations found between uptake, yield. photochemical activity be due light energy enhanced Chl antenna. adequate fertilization therefore evident

Язык: Английский

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Potential of Organic Amendments (AM fungi, PGPR, Vermicompost and Seaweeds) in Combating Salt Stress ... A Review

Plant Stress, Год журнала: 2022, Номер 6, С. 100111 - 100111

Опубликована: Авг. 6, 2022

Climate change and agricultural practices such as the overuse of chemical fertilizers pesticides have exacerbated impact abiotic pressures on crop productivity degraded ecosystem. Salinity is one major stress which affects yield. The increased salt concentration results in deteriorated soil aeration, compaction various biochemical physiological pathways. In response to salinity, plants show two phases, ion independent phase, ion-specific phase. order reduce salinization several conservation methods, appropriate irrigation, reduced inorganic fertilizer use, integrated agroforestry, tillage organic farming, can be used. To overcome or detrimental effect salinity alternative approach amendments a viable present farming techniques, are unsustainable negative environmental repercussions. These contribute gradual release nutrients improved plant performance by providing wide range macro- micronutrients. recent decade, lot studies been conducted highlight importance responses stresses. this problem, exploited eliminate impacts forms stresses (drought, metal) factor affecting plant's study great areas world agriculture increasingly threatened due incorrect practices. Organic applied separately combined help preserving yields an environmentally sustainable way.

Язык: Английский

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Physiological and molecular insight of microbial biostimulants for sustainable agriculture

Frontiers in Plant Science, Год журнала: 2023, Номер 14

Опубликована: Янв. 30, 2023

Increased food production to cater the need of growing population is one major global challenges. Currently, agro-productivity under threat due shrinking arable land, increased anthropogenic activities and changes in climate leading frequent flash floods, prolonged droughts sudden fluctuation temperature. Further, warm climatic conditions increase disease pest incidences, ultimately reducing crop yield. Hence, collaborated efforts are required adopt environmentally safe sustainable agro practices boost growth productivity. Biostimulants appear as a promising means improve plants even stressful conditions. Among various categories biostimulants, microbial biostimulants composed microorganisms such plant growth-promoting rhizobacteria (PGPR) and/or microbes which stimulate nutrient uptake, produce secondary metabolites, siderophores, hormones organic acids, participate nitrogen fixation, imparts stress tolerance, enhance quality yield when applied plants. Though numerous studies convincingly elucidate positive effects PGPR-based on plants, yet information meagre regarding mechanism action key signaling pathways (plant hormone modulations, expression pathogenesis-related proteins, antioxidants, osmolytes etc.) triggered by these present review focuses molecular activated PGPR based facing abiotic biotic The also analyses common mechanisms modulated combat stresses. highlights traits that have been modified through transgenic approach physiological responses akin application target

Язык: Английский

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Deciphering the mechanisms, hormonal signaling, and potential applications of endophytic microbes to mediate stress tolerance in medicinal plants

Frontiers in Plant Science, Год журнала: 2023, Номер 14

Опубликована: Ноя. 15, 2023

The global healthcare market in the post-pandemic era emphasizes a constant pursuit of therapeutic, adaptogenic, and immune booster drugs. Medicinal plants are only natural resource to meet this by supplying an array bioactive secondary metabolites economic, greener sustainable manner. Driven thrust demand for immunity imparting nutraceutical life-saving plant-derived drugs, acreage commercial cultivation medicinal has dramatically increased recent years. Limited resources land water, low productivity, poor soil fertility coupled with climate change, biotic (bacteria, fungi, insects, viruses, nematodes) abiotic (temperature, drought, salinity, waterlogging, metal toxicity) stress necessitate plant productivity enhancement through strategies. Plants evolved intricate physiological (membrane integrity, organelle structural changes, osmotic adjustments, cell tissue survival, reclamation, root-shoot ratio, antibiosis, hypersensitivity, etc.), biochemical (phytohormones synthesis, proline, protein levels, antioxidant enzymes accumulation, ion exclusion, generation heat-shock proteins, synthesis allelochemicals. cellular (sensing signals, signaling pathways, modulating expression stress-responsive genes etc.) mechanisms combat stresses. Endophytes, colonizing different tissues, synthesize novel compounds that can harness mitigate environmental cues, thus making agroecosystems self-sufficient toward green approaches. host set endophytes another interact highly complex manner involving adaptive mechanisms, including appropriate responses triggered stimuli received from sensors situated on cytoplasm transmitting signals transcriptional machinery nucleus withstand stressful environment effectively. Signaling pathways serve as crucial nexus sensing establishing plants’ proper molecular responses. However, underlying critical endophytic microbes meager. This review comprehends diversity endophyte-mediated plant-microbe interactions tolerance understanding cascades defined Leveraging knowledge, researchers design specific microbial formulations optimize health, increase nutrient uptake, boost crop yields, support resilient, agricultural system.

Язык: Английский

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Plant Growth-Promoting Halobacteria and Their Ability to Protect Crops from Abiotic Stress: An Eco-Friendly Alternative for Saline Soils

Agronomy, Год журнала: 2022, Номер 12(4), С. 804 - 804

Опубликована: Март 27, 2022

Arid and semi-arid soils display low productivity due to abiotic stress associated with drought salinity. Halobacteria can increase the yield of crops grown under these types stress. These bacteria thrive across a wide salinity range (1–25% NaCl) also in absence NaCl have direct indirect mechanisms that promote plant growth. This review summarizes studies conducted over past five years assessed effect halobacteria on plants soil fertility. The criteria used selection were reviewed. Few impact has been based qualitative criterion considering morphology colonies media enriched salts, mainly Na+. Not all growing salt-enriched are capable capturing Na+ ions. Therefore, quantitative should be applied for halobacteria, which could their ability capture ions vitro. This, together assessment fertility, may largely contribute recovery saline soils.

Язык: Английский

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Plant Growth-Promoting Rhizobacteria Alleviate High Salinity Impact on the Halophyte Suaeda fruticosa by Modulating Antioxidant Defense and Soil Biological Activity

Frontiers in Plant Science, Год журнала: 2022, Номер 13

Опубликована: Май 26, 2022

Plant growth-promoting rhizobacteria (PGPR) are considered as bio-ameliorators that confer better salt resistance to host plants while improving soil biological activity. Despite their importance, data about the likely synergisms between PGPR and halophytes in native environments scarce. The objective of this study was assess effect (Glutamicibacter sp. Pseudomonas sp.) inoculation on biomass, nutrient uptake, antioxidant enzymes Suaeda fruticosa, an obligate halophyte marshes arid areas Tunisia. Besides, activity rhizospheric enzyme activities upon plant determined. Plants were grown pots filled with irrigated 600 mM NaCl for 1 month. Inoculation (either or Glutamicibacter resulted significantly higher shoot dry weight less accumulation Na+ Cl- shoots salt-treated plants. reduced malondialdehyde (MDA) concentration, increasing (superoxide dismutase; catalase; ascorbate peroxidase; glutathione reductase) by up 100%. This provides strong arguments favor a boosting strain S. fruticosa challenged high salinity. increased K+ Ca2+ content lowered MDA concentration. Regarding activity, enhanced three (urease, ß-glucosidase, dehydrogenase) compared respective non-inoculated saline treatment. Hence, could have great potential be used bio-inoculants order improve growth uptake under stress. Indole-3-acetic acid concentration both bacterial treatments conditions, especially (up +214%). As whole, strains promising candidates part solutions aiming at phytoremediation reclamation saline-degraded areas.

Язык: Английский

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Biofilm formation and flocculation potential analysis of halotolerant Bacillus tequilensis and its inoculation in soil to mitigate salinity stress of chickpea

Physiology and Molecular Biology of Plants, Год журнала: 2023, Номер 29(2), С. 277 - 288

Опубликована: Янв. 20, 2023

Язык: Английский

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Halobacteria-Based Biofertilizers: A Promising Alternative for Enhancing Soil Fertility and Crop Productivity under Biotic and Abiotic Stresses—A Review

Microorganisms, Год журнала: 2023, Номер 11(5), С. 1248 - 1248

Опубликована: Май 9, 2023

Abiotic and biotic stresses such as salt stress fungal infections significantly affect plant growth productivity, leading to reduced crop yield. Traditional methods of managing factors, developing resistant varieties, chemical fertilizers, pesticides, have shown limited success in the presence combined abiotic factors. Halotolerant bacteria found saline environments potential promoters under stressful conditions. These microorganisms produce bioactive molecules regulators, making them a promising agent for enhancing soil fertility, improving resistance adversities, increasing production. This review highlights capability plant-growth-promoting halobacteria (PGPH) stimulate non-saline conditions, strengthen tolerance stressors, sustain fertility. The major attempted points are: (i) various challenges that limit agriculture sustainability food safety, (ii) mechanisms employed by PGPH promote both (iii) important role played recovery remediation agricultural affected soils, (iv) concerns limitations using PGHB an innovative approach boost production security.

Язык: Английский

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