A CRY-DASH-type photolyase/cryptochrome from Sclerotinia sclerotiorum mediates minor UV-A-specific effects on development.
Apothecial development is the multicellular, sexual reproduction phase in the developmental life cycle of Sclerotinia sclerotiorum. This development begins within the sclerotium, a compact aggregation of vegetative hyphae contained within a melanized rind layer. Upon germination from the sclerotium, the apothecial stipe requires exposure to UV-A wavelengths of light to develop a fertile disc. We have identified a gene, cry1 from S. sclerotiorum that is most closely related to photolyase/cryptochrome proteins in the CRY-DASH family. We characterized this CRY-DASH ortholog from S. sclerotiorum and observed significant transcript accumulation only after exposure to UV-A and not in response to other wavelengths of light. Tissue-specific expression studies revealed that cry1 transcripts accumulate to low levels in vegetative mycelia and to higher levels in all light-exposed stages of apothecia development. Maximal cry1 transcript accumulation occurs in stipes between 2 and 6h of continuous UV-A exposure. Mutant strains carrying a deletion of cry1 exhibited a decrease in sclerotial mass and displayed greater numbers of pigmented hyphal projections on apothecial stipes under UV-A treatment but are otherwise developmentally normal. Tissue level localization of Cry1-GFP protein accumulation expressed from the native cry1 promoter was consistent with transcript localization. This study suggests that cry1 may have a function during UV exposure but is not essential for completing the developmental life cycle under laboratory conditions.
Veluchamy
Selvakumar
S
Department of Plant Pathology, University of Florida, 1453 Fifield Hall, Gainesville, FL 32611-0680, USA.
Rollins
Jeffrey A
JA
D017360:Arabidopsis / Q000382:microbiology; D029681:Arabidopsis Proteins; D001203:Ascomycota / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism / Q000528:radiation effects*; D056931:Cryptochromes; D005420:Flavoproteins / Q000235:genetics / Q000378:metabolism*; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal / Q000528:radiation effects*; D005810:Multigene Family; D025282:Mycelium / Q000235:genetics / Q000378:metabolism / Q000528:radiation effects; D010641:Phenotype; D011401:Promoter Regions, Genetic; D017384:Sequence Deletion; D013172:Spores, Fungal / Q000254:growth & development; D014466:Ultraviolet Rays
D029681:Arabidopsis Proteins; C538962:CRY1 protein, Arabidopsis; D056931:Cryptochromes; D005420:Flavoproteins; D005656:Fungal Proteins