ArticleFolia microbiologica2026
Streptomyces as microbial biofactories: optimization of auxin production and growth-promoting activity of cell-free supernatants in soybean (Glycine max (L.) Merr.).
Article in Folia microbiologica, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Auxins are plant growth regulators, and Actinobacteria, particularly Streptomyces, can synthesize indole-3-acetic acid (IAA), the most prevalent auxin, contributing to plant growth promotion. In this study, three auxin-producing Streptomyces isolates (CLV45, CLV104, and CLV194) were characterized, and auxin biosynthesis was evaluated under different cultivation conditions. Isolates were cultivated in ISP2 broth, and auxin-related compounds were quantified using the Salkowski assay and high-performance liquid chromatography (HPLC). Isolates were assigned to the genus Streptomyces based on morphological characteristics and 16S rRNA gene sequence analysis. All isolates produced auxin, albeit with distinct metabolic responses. A One Factor at a Time (OFAT) approach was used to identify favorable culture conditions for each isolate. CLV45 achieved maximal production (day 7, 182.3 µg mL⁻
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