Response of barley to root colonization by<i>Pseudomonas</i>sp. DSMZ 13134 under laboratory, greenhouse, and field conditions

Fröhlich, Andreas; Buddrus-Schiemann, Katharina; Durner, Jörg; Hartmann, Anton; Rad, Uta von

doi:10.1080/17429145.2011.597002

Cited by 42 publications

(31 citation statements)

References 41 publications

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“…Authors observed significant increase in the shoot length, root length, and fresh and dry seedling weight. Fröhlich et al (2012) found that inoculation with PGPR, i.e. Pseudomonas sp.…”

Section: Discussionmentioning

confidence: 99%

ACC-deaminase and/or nitrogen-fixing rhizobacteria and growth response of tomato (Lycopersicon pimpinellfoliumMill.)

Hassan

David

Bashir³

2014

Journal of Plant Interactions

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The study aimed to identify and select important plant growth-promoting rhizobacteria (PGPR) and examine the response of tomato growth upon inoculation. Inoculation with rhizobacterial isolates increased all the measured physical, chemical, and enzymatic growth parameters compared to control. However, the TAN1 isolate had the highest effect, and significantly (P < 0.05) increased the root length (8.25-fold), root fresh (8.36-fold) and dry (12.6-fold) weight, shoot length (6.92-fold), shoot fresh (7.18-fold) and dry (6.90-fold) weight, number of leaves (11.0-fold), chlorophyll a (6.25-fold), chlorophyll b (10.7-fold), carotenoid contents (8.80-fold), seedlings fresh (9.0-fold) and dry (8.71-fold) weight, plant macronutrient uptake, i.e. N (7.7-and 8.9-fold), P (10.5-and 11.4-fold), K (7.8-and 8.8-fold), , and Mg (12.6-and 9-fold) in shoot and root, plant micronutrient uptake, i.e. Zn (6.6-, 10.2-), Cu (9.3-, and 10.3-fold), Fe (7.7-and 10.7-fold), and Mn (4.7-and 5.7-fold) in shoot and root and plant antioxidant enzymes, i.e. glutathione S-transferase (10.7-fold), peroxidase (8.1-fold), and catalase (10.5-fold). Our results concluded that inoculation of agricultural crops with rhizobacteria is a very useful approach to increase the plant growth. The rhizobacteria having both 1-aminocyclopropane-1-carboxylate (ACC) deaminase and nitrogen-fixing activity are more effective than rhizobacteria possessing either ACC-deaminase or nitrogen-fixing activity alone for growth promotion of crops.Keywords: PGPR; ACC-deaminase; nitrogen fixation; ethylene and auxin; tomato IntroductionPlant growth-promoting rhizobacteria (PGPR) are free living microorganisms having beneficial effects on plants by colonizing their roots (Ahemad 2012). PGPR promote the plant growth by several direct and indirect ways (Ahemad 2012). Directly, PGPR provide the bacterium-synthesized compounds to the plants, facilitate the nutrient availability and uptake and production of certain phytohormones, e.g. auxin, cytokinins, ethylene, and abscisic acid and giberelins (Ahemad 2012). Indirectly, PGPR minimize or prevent the harmful effects of pathogenic organisms (Ahemad & Malik 2011), moreover, mobilize the nutrients in soils and improve the soil structure (Ahemad & Malik 2011). Inoculation of agricultural crops with PGPR results in multiple positive effects on plant, e.g. increase in the plant growth and vigor, increment in the chlorophyll, protein, proline, and antioxidant enzymes (e.g. peroxidase (POX), catalase, and glutathione reductase) activity that increase the plant immunity (Sahran & Nehra 2011). It has been observed that increased activity of antioxidant enzymes is correlated with resistance, against both biotic and abiotic stresses, in many plant species (Jan et al. 2011).At present, the use of microorganisms with the aim of improving crop production on sustainable basis has increased tremendously in various parts of the world (Glick 2012). This is due to the emerging demand for dependence diminishing of synthetic chemical products, to the grow...

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“…Authors observed significant increase in the shoot length, root length, and fresh and dry seedling weight. Fröhlich et al (2012) found that inoculation with PGPR, i.e. Pseudomonas sp.…”

Section: Discussionmentioning

confidence: 99%

ACC-deaminase and/or nitrogen-fixing rhizobacteria and growth response of tomato (Lycopersicon pimpinellfoliumMill.)

Hassan

David

Bashir³

2014

Journal of Plant Interactions

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“…A number of different approaches have been investigated with the intention to reduce fertilizer inputs into agroecosystems, including breeding plant varieties with better P acquisition efficiency [6], fertilizer placement strategies [7], or application of soil organisms and natural extracts with plant growth-promoting potential [8][9][10]. These so-called bio-effectors (BEs) include plant growth-promoting rhizobacteria (PGPR) for instance Pseudomonas and Bacillus spp., as well plant-associated fungi, such as arbuscular mycorrhizal fungi (AMF) or Trichoderma spp.…”

Section: Introductionmentioning

confidence: 99%

“…Some BEs induce plant growth by stimulating the plant's own hormone production such as auxins or cytokinins [13,14], or by producing directly hormone-like compounds [15]. Regarding P acquisition, some BEs are associated with increased phosphatase activities in the soil [16][17][18] and have also shown the ability to liberate P from soil particles [9,16,19,20] and from P-recycling fertilizers [21,22]. Another important mechanism is based on the so-called "mycorrhiza helper" effect [23] which has been observed for many bacterial BEs [24].…”

Section: Introductionmentioning

confidence: 99%

Potential of three microbial bio-effectors to promote maize growth and nutrient acquisition from alternative phosphorous fertilizers in contrasting soils

Thonar

Lekfeldt

Cozzolino

et al. 2017

Chem. Biol. Technol. Agric.

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Background: Agricultural production is challenged by the limitation of non-renewable resources. Alternative fertilizers are promoted but they often have a lower availability of key macronutrients, especially phosphorus (P). Biological inoculants, the so-called bio-effectors (BEs), may be combined with these fertilizers to improve the nutrient use efficiency. Methods:The goal of this study was to assess the potential of three BEs in combination with alternative fertilizers (e.g., composted manure, biogas digestate, green compost) to promote plant growth and nutrient uptake in soils typical for various European regions. Pot experiments were conducted in Czech Republic, Denmark, Germany, Italy, and Switzerland where the same variety of maize was grown in local soils deficient in P in combination with alternative fertilizers and the same set of BEs (Trichoderma, Pseudomonas, and Bacillus strains). Common guidelines for pot experiment implementation and performance were developed to allow data comparison, and soils were analyzed by the same laboratory.Results: Efficiency of BEs to improve maize growth and nutrient uptake differed strongly according to soil properties and fertilizer combined. Promising results were mostly obtained with BEs in combination with organic fertilizers such as composted animal manures, fresh digestate of organic wastes, and sewage sludge. In only one experiment, the nutrient use efficiency of mineral recycling fertilizers was improved by BE inoculation. Conclusions:These BE effects are to a large extent due to improved root growth and P mobilization via accelerated mineralization.

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“…have been broadly studied for their roles in plant growth promotion and biological control [16,17,21,25,30,46,59]. Plant growth promoting activities of Pseudomonas spp.…”

Section: Introductionmentioning

confidence: 99%

“…Plant growth promoting activities of Pseudomonas spp. include production of indole acetic acid (IAA) [16], phosphate solubilization [60], degradation of toxic compounds [38] and production of biocontrol agents against fungal phytopathogens like the production of siderophores [7,14] or antibiotics [21,24] as well as against insect pests by the production of insect toxins [41].…”

Section: Introductionmentioning

confidence: 99%

Heavy metal tolerant Pseudomonas protegens isolates from agricultural well water in northeastern Algeria with plant growth promoting, insecticidal and antifungal activities

Bensidhoum

Nabti

Tabli

et al. 2016

European Journal of Soil Biology

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The application of plant growth-promoting bacteria (PGPB) with biocontrol activities as inoculants of crops plants against phytopathogenic fungi and insect pests provides a biological alternative to the use of agrochemicals. Two Pseudomonas sp. strains were isolated from agricultural well water in the area of Bejaia, northeastern Algeria, located rather closely to a lead mine deposit. The isolates S4LiBe and S5LiBe had 16S rRNA gene sequence similarities of 99.4% to 99.7% with Pseudomonas protegens CHAO T and other P. protegens strains. The phenotypic profiles tested with BIOLOG-GN2-microplates were very similar, but showed also some remarkable differences. The isolates S4LiBe and S5LiBe showed plant growthpromoting potential based on the production of the phytohormone indole acetic acid and siderophores and the solubilization of insoluble phosphate. In addition, they produced chitinase and other polymer degrading enzymes. Interestingly, while S4LiBe and S5LiBe were resistant against heavy metals (2.0 mM K2Cr2O7 and 3.0 mM CoSO4, HgSO4, CdSO4 8H2O and PbCl2), the reference strain P. protegens CHAO T was very sensitive to Hg 2+ and Cd 2+ and had lower tolerance towards Co 2+ and Pb 2+ . The isolates S4LiBe and S5LiBe were very active in mycelial growth inhibition assays against Botrytis cinerea, Verticillium dahlia, Fusarium graminearum, Aspergillus niger and A. flavus (growth inhibition between 88% and 48%). Furthermore, S4LiBe and S5LiBe showed effective insecticidal activities, when tested in the Galleria injection assay and they were tested positive for the insect toxin gene fitD alike the reference strain CHA0 T . Finally, inoculation of barley seeds with S5LiBe resulted in significantly stimulated germination rate and growth of seedlings, with increased shoot length, shoot and root fresh weight, shoot and root dry weight as compared to non-inoculated plants.Thus, the heavy metal tolerant isolates S4LiBe and S5LiBe harbor a diverse potential as beneficial bacteria for agricultural application. They may be very useful even in polluted soils for the stimulation of e.g. biomass crops. The demonstration of successful isolation from agricultural well water may open more ready access for a wide variety of this kind of beneficial bacteria for agricultural application.

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Response of barley to root colonization byPseudomonassp. DSMZ 13134 under laboratory, greenhouse, and field conditions

Cited by 42 publications

References 41 publications

ACC-deaminase and/or nitrogen-fixing rhizobacteria and growth response of tomato (Lycopersicon pimpinellfoliumMill.)

ACC-deaminase and/or nitrogen-fixing rhizobacteria and growth response of tomato (Lycopersicon pimpinellfoliumMill.)

Potential of three microbial bio-effectors to promote maize growth and nutrient acquisition from alternative phosphorous fertilizers in contrasting soils

Heavy metal tolerant Pseudomonas protegens isolates from agricultural well water in northeastern Algeria with plant growth promoting, insecticidal and antifungal activities

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