Abstract：
:Plant growth-promoting fungi play an important role in development of sustainable agriculture. In the current study, 13 fungal strains were isolated from the rhizosphere of healthy Triticum aestivum (wheat) plant and screened for their indolic auxin production potential. Aspergillus flavus strain PGFW, Aspergillus niger strain BFW and Aspergillus caespitosus strain DGFW were amongst the most efficient indolic auxin-producing strains. Indolic auxins such as indole 3 acetate (IAA), indole 3 butyrate (IBA) and indole 3 propionate (IPA) are produced by fungi. The conventional method to assess the IAA production is through a spectrophotometric assay using Salkowski's reagent, which quantifies all indolic auxins and not individual auxins. Moreover, it was also observed that the absorption maxima (λmax) of the samples, when compared to that of standard indole-3-acetic acid, showed deviation from the latter, indicative of production of a mixture of indolic derivatives by the fungi. Hence, for further profiling of these indolic compounds, high-performance thin layer chromatography (HPTLC) based protocol was standardized to precisely detect and quantify individual indolic auxins like IAA, IBA and IPA in the range of 100-1000 ng per spot. HPTLC analysis also showed that the fungal strains produce different indolic auxins in media with and without fortification of tryptophan, with the production of indolic auxins being enhanced in presence of tryptophan. Thus, this standardized HPTLC protocol is an efficient and sensitive methodology to separate and quantify the indolic derivatives.
journal_name
3 Biotechjournal_title
3 Biotechauthors
Patel D,Patel A,Vora D,Menon S,Vadakan S,Acharya D,Goswami Ddoi
10.1007/s13205-018-1428-3subject
Has Abstractpub_date
2018-10-01 00:00:00pages
413issue
10eissn
2190-572Xissn
2190-5738pii
1428journal_volume
8pub_type
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