PubMed · 12978434
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
P LANTUEJOUL, A HERAUX. 1952. [Note on the hyaline membrane].. https://pubmed.ncbi.nlm.nih.gov/12978434/
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
Riboflavin (vitamin B2), essential in tiny amounts as a precursor for oxidoreductase coenzymes, is a yellow pigment. Although it causes cytotoxicity via photoinduced damage of macromolecules, several microorganisms are striking overproducers. A question, unanswered for decades, is whether riboflavin overproducers can benefit from this property. Here, we report an ultraviolet (UV) protective effect of riboflavin. The spores of Ashbya gossypii, a riboflavin-overproducing fungus, are more sensitive to UV than those of Aspergillus nidulans. The addition of riboflavin to suspensions improves the UV resistance of both spore types. Interestingly, we show that regulation of sporulation and riboflavin overproduction in A. gossypii are linked. In batch culture, both were elevated when growth ceased. At constant growth rates, obtained in a chemostat culture, neither was elevated. Supplementation of cultures by cAMP, a known stress signal, negatively affected sporulation as well as riboflavin overproduction, establishing a second, independent argument for the linkage.
Explore the source record for details and available documents.
Explore the source record for details and available documents.