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Vitamin B2 (riboflavin) increases drought tolerance of Agaricus bisporus

Title data

Guhr, Alexander ; Horn, Marcus A. ; Weig, Alfons:
Vitamin B2 (riboflavin) increases drought tolerance of Agaricus bisporus.
In: Mycologia. Vol. 109 (2017) Issue 6 . - pp. 860-873.
ISSN 1557-2536
DOI: https://doi.org/10.1080/00275514.2017.1414544

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER133020
Keywords: Differential gene expression; drought stress; microarray; riboflavin; saprotrophic filamentous fung
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology > Lehrstuhl Bodenökologie - Univ.-Prof. Dr. Eva Lehndorff
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 570 Life sciences, biology
Date Deposited: 01 Mar 2018 09:11
Last Modified: 06 May 2019 06:57
URI: https://eref.uni-bayreuth.de/id/eprint/42451