Biosynthetic pathway of indole-3-acetic acid in ectomycorrhizal fungi collected from northern Thailand

Autoři: Jaturong Kumla aff001;  Nakarin Suwannarach aff001;  Kenji Matsui aff003;  Saisamorn Lumyong aff001
Působiště autorů: Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand aff001;  Center of Excellence in Microbial Diversity and Sustainable Utilization, Chiang Mai University, Chiang Mai Thailand aff002;  Graduate School of Sciences and Technology for Innovation, Faculty of Agriculture, Yamaguchi University, Yamaguchi, 7 Japan aff003;  Academy of Science, The Royal Society of Thailand, Bangkok, Thailand aff004
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article


Indole-3-acetic acid (IAA) is an imperative phytohormone for plant growth and development. Ectomycorrhizal fungi (ECM) are able to produce IAA. However, only a few studies on IAA biosynthesis pathways in ECM fungi have been reported. This study aimed to investigate the IAA biosynthesis pathway of six ECM cultures including Astraeus odoratus, Gyrodon suthepensis, Phlebopus portentosus, Pisolithus albus, Pisolithus orientalis and Scleroderma suthepense. The results showed that all ECM fungi produced IAA in liquid medium that had been supplemented with L-tryptophan. Notably, fungal IAA levels vary for different fungal species. The detection of indole-3-lactic acid and indole-3-ethanol in the crude culture extracts of all ECM fungi indicated an enzymatic reduction of indole-3-pyruvic acid and indole-3-acetaldehyde, respectively in the IAA biosynthesis via the indole-3-pyruvic acid pathway. Moreover, the tryptophan aminotransferase activity confirmed that all ECM fungi synthesize IAA through the indole-3-pyruvic acid pathway. Additionally, the elongation of rice and oat coleoptiles was stimulated by crude culture extract. This is the first report of the biosynthesis pathway of IAA in the tested ECM fungi.

Klíčová slova:

Aminotransferases – Biosynthesis – Fungi – High performance liquid chromatography – Rice – Tryptophan – Indoles – Scleroderma


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