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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
In plant rhizosphere Trichoderma produces a siderophore which chelates insoluble Fe (Fe3+) and facilitate its conversion to soluble Fe (Fe2+) form. By doing this, Trichoderma also make Fe source unavailable to pathogenic fungi and thereby deprive them of Fe.