Harnessing wheat genotype &amp;times; Azotobacter strain interactions for sustainable wheat production in semi arid tropics

Behl, R. K.; Narula, Neeru; Vasudeva, Manjula; Sato, Atsuya; Shinano, Takuro; Osaki, Mitsuru

doi:10.3759/tropics.15.121

Cited by 8 publications

(6 citation statements)

References 59 publications

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“…Azotobacteria are aerobic, heterotrophic, and free-living N 2 -fixing bacteria, which can be isolated from soil, water, and sediments [ 2 ]. Several studies have demonstrated that seed inoculation with Azotobacter improves maize [ 3 ], wheat [ 4 , 5 ], and rice [ 6 ] yields. However, although there is a considerable amount of experimental evidence of these positive effects on plant growth, mechanisms involved are not fully understood.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, however, it is well established that non-symbiotic fixation can improve plant growth only indirectly, by increasing soil nitrogen after mineralization of N2-fixers' biomass. More likely, additional abilities of azotobacteria, such as phosphate solubilization and phytohormone and siderophore synthesis, might contribute more directly to increase plant growth and crop yield [ 4 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Genotypic Characterization of Azotobacteria Isolated from Argentinean Soils and Plant‐Growth‐Promoting Traits of Selected Strains with Prospects for Biofertilizer Production

Rubio

Montecchia

Tosi

et al. 2013

The Scientific World Journal

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The genetic diversity among 31 putative Azotobacter isolates obtained from agricultural and non-agricultural soils was assessed using rep-PCR genomic fingerprinting and identified to species level by ARDRA and partial 16S rRNA gene sequence analysis. High diversity was found among the isolates, identified as A. chroococcum, A. salinestris, and A. armeniacus. Selected isolates were characterized on the basis of phytohormone biosynthesis, nitrogenase activity, siderophore production, and phosphate solubilization. Indole-3 acetic-acid (IAA), gibberellin (GA3) and zeatin (Z) biosynthesis, nitrogenase activity, and siderophore production were found in all evaluated strains, with variation among them, but no phosphate solubilization was detected. Phytohormones excreted to the culture medium ranged in the following concentrations: 2.2–18.2 μg IAA mL−1, 0.3–0.7 μg GA3 mL−1, and 0.5–1.2 μg Z mL−1. Seed inoculations with further selected Azotobacter strains and treatments with their cell-free cultures increased the number of seminal roots and root hairs in wheat seedlings. This latter effect was mimicked by treatments with IAA-pure solutions, but it was not related to bacterial root colonization. Our survey constitutes a first approach to the knowledge of Azotobacter species inhabiting Argentinean soils in three contrasting geographical regions. Moreover, this phenotypic characterization constitutes an important contribution to the selection of Azotobacter strains for biofertilizer formulations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genotypic Characterization of Azotobacteria Isolated from Argentinean Soils and Plant‐Growth‐Promoting Traits of Selected Strains with Prospects for Biofertilizer Production

Rubio

Montecchia

Tosi

et al. 2013

The Scientific World Journal

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“…Wheat (Triticum aestivum L.) is one of the most important cereals in the world and is part of a staple diet for nearly 35% of the world's population (Behl et al, 2006). It is grown in about 102 countries of the world covering about 220.69 million hectares of land which is 32% of the total cultivated land of the world.…”

Section: Introductionmentioning

confidence: 99%

Detection of soil fungi from wheat cultivated area

Seth

Alam

Shukla

2018

Bangladesh J. Agric. Res

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“…[1][2][3] It results from their ability to fix nitrogen, produce plant growth promoting and fungicidal substances, vitamins or siderophores. Synthesis of biologically active substances by Azotobacter sp.…”

Section: Introductionmentioning

confidence: 99%

In Vitroeffects of various xenobiotics onAzotobacter chroococcumstrains isolated from soils of southern Poland

Lenart

2012

Journal of Environmental Science and Health, Part B

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Fourteen Azotobacter chroococcum strains isolated from soils of Southern Poland were studied concerning resistance to various xenobiotics: heavy metal ions: Cd(2+,) Cu(2+), Fe(3+), Mn(2+), Pb(2+), Zn(2+), pesticides: herbicides linuron (3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea) and combination of mecoprop ((RS)-2-(4-chloro-2-methylphenoxy)propanoic acid), dicamba (3,6-dichloro-2-methoxybenzoic acid) and MCPA (2-methyl-4-chlorophenoxyacetic acid), fungicide copper oxychloride, insecticide fenitrothion (O,O-Dimethyl O-(3-methyl-4-nitrophenyl) phosphorothioate) and eight antibiotics commonly used against Gram-negative bacteria. The tested soils were divided into seven groups of land use: forest, field crop, park, urban lawn, industrial area, garden and fallow land, and were analyzed for the following heavy metal ion concentrations using the atomic absorption spectrometry (AAS) technique: Cd(2+,) Cu(2+), Fe(3+), Mn(2+), Pb(2+), Zn(2+). All strains were resistant to Pb(2+), whereas other metals caused the growth inhibition of the analyzed strains. There was no significant relationship between metal concentrations in the analyzed soils and metal resistance of the isolates. Herbicide linuron did not inhibit the growth of A. chroococcum in any of the concentrations. All other pesticides caused the growth inhibition only in the concentrate forms. All isolates were sensitive to β-lactam antibiotic Meropenem, however high intraspecies differentiation was observed concerning resistance to other antibiotics. The obtained results require further study regarding resistance mechanisms and possible use of the xenobiotic-resistant strains in land rehabilitation.

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Harnessing wheat genotype × Azotobacter strain interactions for sustainable wheat production in semi arid tropics

Cited by 8 publications

References 59 publications

Genotypic Characterization of Azotobacteria Isolated from Argentinean Soils and Plant‐Growth‐Promoting Traits of Selected Strains with Prospects for Biofertilizer Production

Genotypic Characterization of Azotobacteria Isolated from Argentinean Soils and Plant‐Growth‐Promoting Traits of Selected Strains with Prospects for Biofertilizer Production

Detection of soil fungi from wheat cultivated area

In Vitroeffects of various xenobiotics onAzotobacter chroococcumstrains isolated from soils of southern Poland

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