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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2018: 95.39
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2018: 95.39
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
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Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2017.6(10): 3304-3312
DOI: https://doi.org/10.20546/ijcmas.2017.610.387


Dynamics of Iron in Rhizosphere
Lokesh Patil1*, G.S. Yogesh2, N. Hamsa1 and H.M. Honnappa1
1Department of Soil Science and Agricultural Chemistry, UAS GKVK, Bengaluru, 560065, India
2Subject Matter Specialist (Soil Science) Krishi Vigyan Kendra, Haradanahally,Chamarajnagar, 571 313, India
*Corresponding author
Abstract:

Iron (Fe) in the soil is present mostly in the form of insoluble Fe (III) oxides and hydroxides (e.g. haematite, goethite, ferrihydrite). The total iron in soil is much higher than most crops require. Nevertheless, the concentration of free Fe (III) in most agricultural soils is far below that required for optimal plant growth, which is between 10–9 and 10–4 M Fe (III) in the soil solution (Lindsay and Schwab, 1982). Generally, chelation of Fe (III) is the most successful mechanism by which plants roots can acquire Fe. Production of chelating compounds by microorganisms increases Fe solubility in the rhizosphere and hence increases plant Fe acquisition. Bacterial and fungal siderophores and other chelating metabolites are assumed to serve as major sources of plant-available Fe in the rhizosphere. Moreover, from the earlier literature it is well known that microbial chelates produced in the rhizosphere mobilize Fe (III) from insoluble Fe sources. In cultivated soil iron is oxidized to form ferric oxide and oxy hydroxides results in low availability of iron for living organisms. To face the demand of Fe (III) in the rhizosphere leads to strong competition for this nutrient among living organisms, plants and microorganisms have developed active strategies of iron uptake. Efficient siderophores of microbial populations from the rhizosphere do not compete with the plant harboring them, and even seems to contribute to the plant iron nutrition. The complex interaction between soil chemical properties, plants, and microbes affects the iron dynamics in the rhizosphere, which in turn impact the plant health and nutrition.


Keywords: Rhizosphere, Iron dynamics, Siderophores, Chelating ligands.
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How to cite this article:

Lokesh Patil, G.S. Yogesh, N. Hamsa and Honnappa, H.M. 2017. Dynamics of Iron in RhizosphereInt.J.Curr.Microbiol.App.Sci. 6(10): 3304-3312. doi: https://doi.org/10.20546/ijcmas.2017.610.387