Cytokinin producing bacteria stimulate amino acid deposition by wheat roots

Kudoyarova, G. R.; Melentiev, A.I.; Martynenko, Elena; Timergalina, L.N.; Архипова, Т. Н.; Shendel, G. V.; Kuzmina, L. Yu.; Dodd, Ian C.; Veselov, S. Yu.

doi:10.1016/j.plaphy.2014.08.015

Cited by 128 publications

(71 citation statements)

References 37 publications

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“…The plants inoculated with cytokinin-producing bacteria B. subtilis showed the increased chlorophyll content and cytokinin accumulation, which led to the increase in weight of shoots and roots [90,91]. On the other hand, treatment of plant with a substance obtained from cytokinin-producing microorganisms, typically colonizing in wheat roots [92,93], increased chlorophyll content in leaf; in this case, the level of chlorophyll was comparable to that observed in the plants treated with a synthetic cytokinin benzyladenine.…”

Section: Production Of Plant Hormones and Other Beneficial Plant Metamentioning

confidence: 86%

The Role of Soil Beneficial Bacteria in Wheat Production: A Review

Çakmakçı¹,

Turan²,

Kıtır³

et al. 2017

Wheat Improvement, Management and Utilization

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Free-living plant growth-promoting rhizobacteria (PGPR) have favourable effect on plant growth, tolerance against stresses and are considered as a promising alternative to inorganic fertilizer for promoting plant growth, yield and quality. PGPR colonize at the plant root, increase germination rates, promote root growth, yield, leaf area, chlorophyll content, nitrogen content, protein content, tolerance to drought, shoot and root weight, and delayed leaf senescence. Several important bacterial characteristics, such as biological nitrogen fixation, solubilization of inorganic phosphate and mineralization of organic phosphate, nutrient uptake, 1-aminocydopropane-1-carboxylic acid (ACC) deaminase activity and production of siderophores and phytohormones, can be assessed as plant growth promotion traits. By efficient use, PGPR is expected to contribute to agronomic efficiency, chiefly by decreasing costs and environmental pollution, by eliminating harmful chemicals. This review discusses various bacteria acting as PGPR, their genetic diversity, screening strategies, working principles, applications for wheat and future aspects in terms of efficiency, mechanisms and the desirable properties. The elucidation of the diverse mechanisms will enable microorganisms developing agriculture further.

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Section: Production Of Plant Hormones and Other Beneficial Plant Metamentioning

confidence: 86%

The Role of Soil Beneficial Bacteria in Wheat Production: A Review

Çakmakçı¹,

Turan²,

Kıtır³

et al. 2017

Wheat Improvement, Management and Utilization

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“…Depending on the specific amino acid, rhizobacteria either decreased or had no effect on (but never increased) concentrations of these compounds in the rhizospheres of two potato (S. tuberosum) cultivars. While certain PGPR can stimulate rhizodeposition of amino acids (Kudoyarova et al, 2014), the measured decreases in amino acid concentrations around inoculated potato roots suggest bacterial uptake and utilisation of such root-exuded amino acids. This hypothesis is supported by observations of active chemotaxis of bacteria to amino acids exuded from roots (De Weert et al, 2002;Oku et al, 2012), rapid microbial degradation of these compounds in the rhizosphere (Owens & Jones, 2001;Ryan et al, 2001;Jones et al, 2013) and the ability of many plant-associated bacteria (Frankenberger & Arshad, 1995) including the studied PGPR strains (Tables 2 and 3) to use amino acids as nutrients.…”

Section: Discussionmentioning

confidence: 98%

Rhizobacteria that produce auxins and contain 1‐amino‐cyclopropane‐1‐carboxylic acid deaminase decrease amino acid concentrations in the rhizosphere and improve growth and yield of well‐watered and water‐limited potato (Solanum tuberosum)

Белимов

Dodd

Safronova

et al. 2015

Annals of Applied Biology

129

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Plant-growth-promoting rhizobacteria (PGPR) utilise amino acids exuded from plant root systems, but hitherto there have been no direct measurements of rhizosphere concentrations of the amino acid 1-amino-cyclopropane-1-carboxylic acid (ACC) following inoculation with PGPR containing the enzyme ACC deaminase. When introduced to the rhizosphere of two potato (Solanum tuberosum) cultivars (cv. Swift and cv. Nevsky), various ACC deaminase containing rhizobacteria (Achromobacter xylosoxidans Cm4, Pseudomonas oryzihabitans Ep4 and Variovorax paradoxus 5C-2) not only decreased rhizosphere ACC concentrations but also decreased concentrations of several proteinogenic amino acids (glutamic acid, histidine, isoleucine, leucine, phenylalanine, serine, threonine, tryptophan, tyrosine, valine). These effects were not always correlated with the ability of the bacteria to metabolise these compounds in vitro, suggesting bacterial mediation of root amino acid exudation. All rhizobacteria showed similar root colonisation following inoculation of sand cultures, thus species differences in amino acid utilisation profiles apparently did not confer any selective advantage in the potato rhizosphere. Rhizobacterial inoculation increased root biomass (by up to 50%) and tuber yield (by up to 40%) in pot trials, and tuber yield (by up to 27%) in field experiments, especially when plants were grown under water-limited conditions. Nevertheless, inoculated and control plants showed similar leaf water relations, indicating that alternative mechanisms (regulation of phytohormone balance) were responsible for growth promotion. Rhizobacteria generally increased tuber number more than individual tuber weight, suggesting that accelerated vegetative development was responsible for increased yield.

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“…are commonly found in the rhizosphere of a wide variety of plant species and stimulate plant growth through direct or indirect mechanisms (Podile and Kishore, 2006). Direct plant growth promotion is often executed via increasing bioavailability of mineral nutrients such as nitrogen, phosphorous, and iron (Lugtenberg and Kamilova, 2009) or by providing amino acids and other nutritional factors (Simons et al, 1997; Compant et al, 2010; Vial et al, 2011) or by synthesis of plant growth regulating compounds such as indole acetic acid (IAA), gibberellins, acetoin (3-hydroxy-2-butanone), 2,3-butanediol, and cytokinin (Arshad and Frankenberger, 1991; Spaepen et al, 2007; Kang et al, 2014; Kudoyarova et al, 2014; Piechulla and Degenhardt, 2014). Besides, rhizobacteria often metabolize compounds like phenylacetic acid (PAA), the stress ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC), and show chemotaxis toward the source of gamma-aminobutyrate (GABA) and together they contribute toward successful plant–microbe interaction (Glick et al, 1998; Shah et al, 1998; Glick, 2004; Onofre-Lemus et al, 2009; Reyes-Darias et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Genome-Guided Insights into the Plant Growth Promotion Capabilities of the Physiologically Versatile Bacillus aryabhattai Strain AB211

et al. 2017

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Bacillus aryabhattai AB211 is a plant growth promoting, Gram-positive firmicute, isolated from the rhizosphere of tea (Camellia sinensis), one of the oldest perennial crops and a major non-alcoholic beverage widely consumed all over the world. The whole genome of B. aryabhattai AB211 was sequenced, annotated and evaluated with special focus on genomic elements related to plant microbe interaction. It’s genome sequence reveals the presence of a 5,403,026 bp chromosome. A total of 5226 putative protein-coding sequences, 16 rRNA, 120 tRNA, 8 ncRNAs, 58 non-protein coding genes, and 11 prophage regions were identified. Genome sequence comparisons between strain AB211 and other related environmental strains of B. aryabhattai, identified about 3558 genes conserved among all B. aryabhattai genomes analyzed. Most of the common genes involved in plant growth promotion activities were found to be present within core genes of all the genomes used for comparison, illustrating possible common plant growth promoting traits shared among all the strains of B. aryabhattai. Besides the core genes, some genes were exclusively identified in the genome of strain AB211. Functional annotation of the genes predicted in the strain AB211 revealed the presence of genes responsible for mineral phosphate solubilization, siderophores, acetoin, butanediol, exopolysaccharides, flagella biosynthesis, surface attachment/biofilm formation, and indole acetic acid production, most of which were experimentally verified in the present study. Genome analysis and experimental evidence suggested that AB211 has robust central carbohydrate metabolism implying that this bacterium can efficiently utilize the root exudates and other organic materials as an energy source. Genes for the production of peroxidases, catalases, and superoxide dismutases, that confer resistance to oxidative stresses in plants were identified in AB211 genome. Besides these, genes for heat shock tolerance, cold shock tolerance, glycine-betaine production, and antibiotic/heavy metal resistance that enable bacteria to survive biotic/abiotic stress were also identified. Based on the genome sequence information and experimental evidence as presented in this study, strain AB211 appears to be metabolically diverse and exhibits tremendous potential as a plant growth promoting bacterium.

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Cytokinin producing bacteria stimulate amino acid deposition by wheat roots

Cited by 128 publications

References 37 publications

The Role of Soil Beneficial Bacteria in Wheat Production: A Review

The Role of Soil Beneficial Bacteria in Wheat Production: A Review

Rhizobacteria that produce auxins and contain 1‐amino‐cyclopropane‐1‐carboxylic acid deaminase decrease amino acid concentrations in the rhizosphere and improve growth and yield of well‐watered and water‐limited potato (Solanum tuberosum)

Genome-Guided Insights into the Plant Growth Promotion Capabilities of the Physiologically Versatile Bacillus aryabhattai Strain AB211

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