Inoculating wheat seedlings with exopolysaccharide-producing bacteria restricts sodium uptake and stimulates plant growth under salt stress

Ashraf, Muhammad; Hasnain, Shahida; Berge, Odile; Mahmood, Tariq

doi:10.1007/s00374-004-0766-y

Cited by 342 publications

(227 citation statements)

References 30 publications

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“…Results of another similar experiment conducted with the strains used in our earlier study (Ashraf, et al, 2004) also showed comparable trends except a significant correlation (r = 0.898, p<0.01) of the number of primary (seminal) roots with K + content of the plant (unpublished data). Although role of the cations K + , Ca 2+ and the K + /Na + ratio in maintaining osmotic potential of the plants against rootzone salinity is well established (Song and Fujiyama, 1996), researchers have observed both positive and no effect of cation feeding on growth of the plants (Jeschke and Wolf, 1988).…”

Section: Discussionsupporting

confidence: 62%

“…In uninoculated control, however, because of lack of RSs, a lower EPS-producing bacterial population density harboured initially on the roots and a lower soil microbial activities, a bigger part of the roots was uncovered and devoid of RS. This higher uncovered root area thus was prone to a higher influx of Na + in the plant (Ashraf, et al, 2004). This increased influx of Na + through uncovered root area suppressed the activity of the plant growth promoting phytohormones (Munns, 2002) and resulted in a decrease in growth of roots and in consequence a decrease in growth of shoot of the plants.…”

Section: Discussionmentioning

confidence: 99%

“…A series of research studies, therefore, was initiated to isolate and identify the EPS-producing bacteria from rhizosphere of wheat and barley plants grown on the salt-affected soils (Ashraf, et al 1999) and to investigate various aspects of EPS-producing bacterial inoculation on growth of the crop plants in the saline environments with a view to find its practical and biotechnological implications for agriculture industry. In our previous research report (Ashraf, et al 2004) a restricted uptake of Na + by wheat plants inoculated with the EPS-producing bacterial isolates MAS765 (Aeromonas hydrophila/caviae), MAS17 (Bacillus insolitus), and MAS617, MAS620, MAS820 (Bacillus sp.) grown in a salt-affected soil was observed.…”

Section: Introductionmentioning

confidence: 94%

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Effect of exo-polysaccharides producing bacterial inoculation on growth of roots of wheat (Triticum aestivum L.) plants grown in a salt-affected soil

Ashraf

Hasnain

Berge

2006

Int. J. Environ. Sci. Technol.

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Effect of soil salinity on physico-chemical and biological properties renders the salt-affected soils unsuitable for soil microbial processes and growth of the crop plants. Soil aggregation around roots of the plants is a function of the bacterial exo-polysaccharides (EPS), however, such a role of the EPS-producing bacteria in the saline environments has rarely been investigated. Pot experiments were conducted to observe the effects of inoculating six strains of EPS-producing bacteria on growth of primary (seminal) roots and its relationship with saccharides, cations (Ca 2+ , Na + , K + ) contents and mass of rhizosheath soils of roots of the wheat plants grown in a salt-affected soil. A strong positive relationship of RS with different root growth parameters indicated that an integrated influence of various biotic and abiotic RS factors would have controlled and promoted growth of roots of the inoculated wheat plants. The increase in root growth in turn could help inoculated wheat plants to withstand the negative effects of soil salinity through an enhanced soil water uptake, a restricted Na + influx in the plants and the accelerated soil microbial process involved in cycling and availability of the soil nutrients to the plants. It was concluded that inoculation of the EPS-producing would be a valuable tool for amelioration and increasing crop productivity of the salt-affected soils.

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Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

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Effect of exo-polysaccharides producing bacterial inoculation on growth of roots of wheat (Triticum aestivum L.) plants grown in a salt-affected soil

Ashraf

Hasnain

Berge

2006

Int. J. Environ. Sci. Technol.

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“…accumulation by the PGPR treatment can also be attributed to the bacterial exopolysaccharides, which bind cations (especially Na ? ) in roots, thus prevent their transfer to leaves and help alleviate salt stress in plants (Ashraf et al 2004). …”

Section: Discussionmentioning

confidence: 99%

Native halo-tolerant plant growth promoting rhizobacteria Enterococcus and Pantoea sp. improve seed yield of Mungbean (Vigna radiata L.) under soil salinity by reducing sodium uptake and stress injury

Panwar

Tewari

Nayyar

2016

Physiol Mol Biol Plants

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The beneficial microbial-plant interaction plays important role in the soil health, crop growth and productivity. Plant growth promoting rhizobacteria (PGPR) are such beneficial microorganisms, which in association with plant roots not only promote their growth but also help in counteracting the detrimental effects of soil stresses. Salt stress is one such stress, frequently confronted by the plants. The present study aimed at isolation and identification of PGPR inhabiting the mungbean rhizosphere, testing them for salt (NaCl) tolerance and subsequently in salt-supplemented mungbean crop. For this purpose, two salt-tolerant bacterial strains belonging to genus Pantoea and Enterococcus, characterized for their P-solubilization ability, indole acetic acid and siderophore production were selected. These two PGPR were further evaluated for their effect on the salt-stressed mungbean plants, grown at two salt concentrations (5 and 10 dS/m). The plants treated with the combination of PGPR showed better performance in growth (16-37 %) and yield (22-32 %), under salt stress, as compared with control. The increasing salt concentration was found to increase the membrane damage, Na ? concentration in the plants. PGPR treatments effectively reduced the Na ? concentration (17-41 %), membrane damage (1.1-1.5 folds) and enhanced the antioxidants i.e. ascorbic acid (8-26 %) and glutathione (10-30 %) in salt-stressed plants, in comparison to uninoculated stressed plants. Overall, the results indicated that both PGPR were effective as stress mitigators however, in combination they showed relatively better improvement in growth, yield as well as oxidative parameters of the salt-affected plants. These findings about the effects of native salt-tolerant PGPR Pantoea and Enterococcus sp. in mungbean crop are novel.

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“…Nitrogen is the one of the major limiting factors for plant growth, and the application of N 2 -fixing microbes as biofertilizers has emerged Aeromonas hydrophila MAS-765 Salinity stress Alleviate salinity, growth [74] Aeromonas vaga BAM-77 Alkalinity stress Growth and yield [75] Aeromonas vaga BAM-77 Salinity stress Growth and yield [75] Arthrobacter sulfonivorans IARI-L- 16 Cold stress Growth and alleviation [8] Azospirillum brasilense NO 40 Drought and heat stress Improved homeostatic [76] Azospirillum brasilense Sp245 Drought and heat stress Coleoptiles growth [77] Azospirillum brasilense Sp245 Drought and heat stress Grain yield, mineral quality [78] Azospirillum brasilense Sp245 Cold stress Affected dry weight [79] Azospirillumlipoferum AZ1, AZ9, AZ45 Drought and heat stress Alleviate the drought stress [80] Bacillus aerophilus BSH15 Acidic stress Growth and alleviate acidity [81] Bacillus alcalophilus BCZ14 Drought and heat stress Growth, yield, stress [81] Bacillus altitudinis IARI-HHS2-2 Cold stress Growth and yield [28] Bacillus altitudinis BNW15 Alkalinity stress Growth and alleviate alkalinity [81] Bacillus amyloliquefaciens BNE12 Salinity stress Growth and alleviate salinity [81] Bacillus amyloliquefaciens IARI-HHS2-30…”

Section: Beneficial Microbes For Sustainable Agriculturementioning

confidence: 99%

Beneficial microbiomes: Biodiversity and potential biotechnological applications for sustainable agriculture and human health

Yadav¹,

Kumar²,

Kumar³

et al. 2017

J App Biol Biotech

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The beneficial microbes plays an important role in medical, industrial, and agricultural processes. The precious microbes belong to different groups including archaea, bacteria, and fungi which can be sort out from different habitat such as extreme environments (acidic, alkaline, drought, pressure, salinity, and temperatures) and associated with plants (epiphytic, endophytic, and rhizospheric) and human. The beneficial microbes exhibited multifunctional plant growth promoting (PGP) attributes such as N 2 -fixation, solubilization of micronutrients (phosphorus, potassium and zinc), and production of siderophores, antagonistic substances, antibiotic, auxin, and gibberellins. These microbes could be applied as biofertilizers for native as well as crops growing at diverse extreme habitat. Microbes with PGP attributes of N 2 -fixation, P-, and K-solubilization could be used at a place of NPK chemical fertilizers. Agriculturally, important microbes with Fe-and Zn-solubilizing attributes can be used for biofortification of micronutrients in different cereal crops. The biofertilizers are an eco-friendly technology and bioresources for sustainable agriculture and human health. In general, the concentrations of micronutrient in different crops are not adequate for human nutrition in diets. Hence, consumption of such cereal-based diet may result in micronutrient malnutrition and related severe health complications. The biofortification approach is getting much attention to increase the availability of micronutrients, especially Fe and Zn in the major food crops. The beneficial microbes can be used as probiotic as functional foods for human health. Probiotics microbes such as Bifidobacterium, Lactobacillus, Methanobrevibacter, Methanosphaera, and Saccharomyces are increasingly being used as dietary supplements in functional food products. The microbes with beneficial properties could be utilized for sustainable agriculture and human health.

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Inoculating wheat seedlings with exopolysaccharide-producing bacteria restricts sodium uptake and stimulates plant growth under salt stress

Cited by 342 publications

References 30 publications

Effect of exo-polysaccharides producing bacterial inoculation on growth of roots of wheat (Triticum aestivum L.) plants grown in a salt-affected soil

Effect of exo-polysaccharides producing bacterial inoculation on growth of roots of wheat (Triticum aestivum L.) plants grown in a salt-affected soil

Native halo-tolerant plant growth promoting rhizobacteria Enterococcus and Pantoea sp. improve seed yield of Mungbean (Vigna radiata L.) under soil salinity by reducing sodium uptake and stress injury

Beneficial microbiomes: Biodiversity and potential biotechnological applications for sustainable agriculture and human health

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