Indole-3-acetic acid production by actinomycete isolated from certain rhizospheres of medicinal plants
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Date
2021-10-13
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Publisher
University of Oum El Bouaghi
Abstract
Most actinomycetes in soil belong to the genus Streptomyces and 60% of the sources of most biologically active compounds such as antifungal and antibacterial compounds or plant growth promoting substances that have been developed for agricultural use originated. Rhizobacteria were isolated from the rhizosphere and assayed for their ability to produce different enzymes in vitro. The twenty one isolates that inhibited at least five pathogens were then selected, identified and assessed for their attributes to produce indole-3-acetic acid (IAA) in a yeast malt extract medium supplemented with 0.2 mg/mL L-tryptophan. All strains are unable to produce indole acetic acid. The isolates varied greatly in their potential for auxin production (ranging from 77.33 to 379.83 μg ml1). Tryptophan is considered a physiological precursor of auxins in higher plants and also in microorganisms. The best results were shown by five actinomycete strains, suggesting their possible utilization as biofertilizer agents for sustainable agriculture.
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Keywords
Rhizobacteria; Plant growth-promoting rhizobacteria; Indol-3-acetic acid; L tryptophan