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Variation in UV-Mediated Damage Recovery Among Pseudoidium neolycopersici Isolates: Possible Mechanisms

The cryptochrome/photolyase family (CPF) consists of a diversified class of flavoproteins that are evolutionarily related. Although their domain architecture is highly conserved, they perform entirely different physiological functions. Previous studies have confirmed the presence of a functional photolyase in Pseudoidium neolycopersici, which repairs UV-C-induced DNA damage by using near UV-A/blue light as an energy source. Similar doses of UV-C treatment followed by incubation with dark or blue light was tested on conidia germination of five isolates of P. neolycopersici collected from different regions of Norway and the Netherlands. The results showed variations in the effect of UV on germination and germination recovery under blue light incubation after UV treatment. Evolutionary studies confirmed that P. neolycopersici photolyase is highly conserved among different isolates of P. neolycopersici and among different species. All CPF members have a core domain consisting of an identical cofactor, flavin adenine dinucleotide (FAD), and an additional photoantenna chromophore. An amino acid sequence analysis demonstrated that CPF members have highly conserved C terminals compared with their N terminals, because FAD binds in the C-terminal region. When compared with other CPF members, varying lengths of N and C terminals were noticed in P. neolycopersici photolyase and putative cryptochrome, respectively. Further research using comparative genomics targeting pyrimidine base composition, the role of regulatory elements, including promotor architecture, and the characterization of optical properties of native photolyase among isolates may help to explain the differences in the biological responses of conidia germination of P. neolycopersici treated with UV. [Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license .