Detection of phytohormones in temperate forest fungi predicts consistent abscisic acid production and a common pathway for cytokinin biosynthesis

The phytohormones, abscisic acid and cytokinin, once were thought to be present uniquely in plants, but increasing evidence suggests that these hormones are present in a wide variety of organisms. Few studies have examined fungi for the presence of these "plant" hormones or addressed wheth...

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Bibliographic Details
Published in:Mycologia 2015-03, Vol.107 (2), p.245-257
Main Authors: Morrison, Erin N., Knowles, Sarah, Hayward, Allison, Thorn, R. Greg, Saville, Barry J., Emery, R.J.N.
Format: Article
Language:English
Subjects:
abscisic acid
Abscisic Acid - analysis
Abscisic Acid - biosynthesis
BIOCHEMISTRY/PHYSIOLOGY
Chromatography, High Pressure Liquid
cytokinins
Cytokinins - analysis
Cytokinins - biosynthesis
Forests
fungi
Fungi - chemistry
Fungi - classification
Fungi - isolation & purification
Fungi - metabolism
high performance liquid chromatography-electrospray ionization tandem mass spectrometry
Plant Growth Regulators - analysis
Plant Growth Regulators - biosynthesis
Tandem Mass Spectrometry
Trees - microbiology
tRNA degradation pathway
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Summary:The phytohormones, abscisic acid and cytokinin, once were thought to be present uniquely in plants, but increasing evidence suggests that these hormones are present in a wide variety of organisms. Few studies have examined fungi for the presence of these "plant" hormones or addressed whether their levels differ based on the nutrition mode of the fungus. This study examined 20 temperate forest fungi of differing nutritional modes (ectomycorrhizal, wood-rotting, saprotrophic). Abscisic acid and cytokinin were present in all fungi sampled; this indicated that the sampled fungi have the capacity to synthesize these two classes of phytohormones. Of the 27 cytokinins analyzed by HPLC-ESI MS/MS, seven were present in all fungi sampled. This suggested the existence of a common cytokinin metabolic pathway in fungi that does not vary among different nutritional modes. Predictions regarding the source of isopentenyl, cis-zeatin and methylthiol CK production stemming from the tRNA degradation pathway among fungi are discussed.
ISSN:0027-5514
1557-2536
DOI:10.3852/14-157