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Vitamin B2 (riboflavin) increases drought tolerance of Agaricus bisporus


Guhr, Alexander ; Horn, Marcus A. ; Weig, Alfons:
Vitamin B2 (riboflavin) increases drought tolerance of Agaricus bisporus.
In: Mycologia. (2017) . - S. 1-14.
ISSN 1557-2536
DOI: https://doi.org/10.1080/00275514.2017.1414544


Drought is a stressor for many soil-inhabiting organisms. Although plants have been extensively investigated for drought-adaptive mechanisms, little information is available for fungi. Antioxidants are especially relevant, since desiccation is accompanied by an excessive intracellular production of reactive oxygen species. Riboflavin (vitamin B2) is one antioxidant regulating drought tolerance in plants. A similar function may exist in fungi. Here, we examined the respiratory and transcriptional responses of Agaricus bisporus to drought and the impact of riboflavin. Mesocosm experiments with four groups were established: hyphae were treated with or without 50 µM riboflavin under drought or no drought conditions. Drought increased riboflavin content in hyphae about 5 times with, but also without, addition of riboflavin. Without addition of riboflavin, fungal respiration decreased by more than 50% at water potentials of about −20 MPa. With addition of riboflavin, respiration remained about 2–3 times higher. The transcriptional responses to only drought or only riboflavin strongly overlapped and were mainly based on factors regulating transcription and translation. This was even stronger in combined treatments. Riboflavin induced protective mechanisms in drought-stressed hyphae. Most pronounced was the methylglyoxal (cytotoxic by-product of glycolysis) detoxifying of lactoylglutathione lyase. Thus, our data suggest a stress-priming function and a role of riboflavin in drought responses of A. bisporus.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Differential gene expression; drought stress; microarray; riboflavin; saprotrophic filamentous fung
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 570 Biowissenschaften; Biologie
Eingestellt am: 01 Mär 2018 09:11
Letzte Änderung: 01 Mär 2018 09:14
URI: https://eref.uni-bayreuth.de/id/eprint/42451