Vitamin B2 (riboflavin) increases drought tolerance of Agaricus bisporus

Mycologia
Alexander GuhrAlfons R Weig

Abstract

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 ...Continue Reading

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Citations

Jan 18, 2020·Microbial Ecology·Alexander Guhr, Sophia Kircher
Feb 5, 2021·Environmental Microbiology·Felix WesenerBritta Tietjen
Apr 10, 2021·Critical Reviews in Biotechnology·Haritha Meruvu, Júlio César Dos Santos
Apr 25, 2020·The Science of the Total Environment·Ran TongLina Jiang

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