Plant Growth Promoting Characterization of Indigenous Azotobacteria Isolated from Soils in Iran.
Summary of "Plant Growth Promoting Characterization of Indigenous Azotobacteria Isolated from Soils in Iran."
It has been well known that the bacteria of the genus Azotobacter, in addition to the beneficial N(2)-fixing activity, are able to improve plant growth by a number of direct and indirect mechanisms. To identify this potential in indigenous azotobacteria, the efficiency of 17 isolates of Azotobacter from the rhizosphere of wheat and barley plants cultivated in salt- and/or drought-affected soils in Iran were evaluated for their ability to dissolve inorganic and organic phosphates, siderophore secretion, indole acetic acid (IAA) production; and protease, chitinase, and ACC deaminase (ACCD) activities. First, they were biochemically characterized and one isolate (strain) was identified by 16S rDNA sequencing. Eight isolates were designated as Azotobacter vinelandii and the remaining isolates were identified as A. chroococcum. All isolates hydrolyzed the organic and inorganic phosphate compounds and effectively produced IAA. Fifteen isolates produced siderophore, but only one isolate showed protease activity which is being reported for the first time in relation to Azotobacter. None of the 17 isolates was capable of producing ACCD or chitinase. However, polymerase chain reaction amplification of the ACCD coding genes, by the use of the gene-specific primers, indicated that not all contain the ACCD gene. The standard screening methods with slight modifications, especially in the case of ACCD assay, were applied. The results showed that the use of specific screening methods, modified according to bacterial nutritional requirements, are the efficient methods for precise evaluation of the plant growth promoting rhizobacteria activity.
Department of Cellular and Molecular Biology, Biological Science Faculty, Azarbaijan University of Tarbiat Moallem, Tabriz, Iran, firstname.lastname@example.org.
This article was published in the following journal.
Name: Current microbiology
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22294493
- DOI: http://dx.doi.org/10.1007/s00284-012-0083-x
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Medical and Biotech [MESH] Definitions
Endogenous or exogenous substances which inhibit the normal growth of human and animal cells or micro-organisms, as distinguished from those affecting plant growth (= PLANT GROWTH REGULATORS).
A group of phenotypically similar but genotypically distinct species (genomovars) in the genus BURKHOLDERIA. They are found in water, soil, and the rhizosphere of crop plants. They can act as opportunistic human pathogens and as plant growth promoting and biocontrol agents.
Abscission-accelerating plant growth substance isolated from young cotton fruit, leaves of sycamore, birch, and other plants, and from potatoes, lemons, avocados, and other fruits.
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A class of plant growth hormone isolated from cultures of Gibberella fujikuroi, a fungus causing Bakanae disease in rice. There are many different members of the family as well as mixtures of multiple members; all are diterpenoid acids based on the gibberellane skeleton.