Of seven plant viruses tested, all except tobacco mosaic showed the phenomenon of photoreactivation, i.e. plants exposed to visible light after inoculation with preparations partially inactivated by ultraviolet radiation produced more local lesions than plants kept in darkness. Five straiIis of tobacco mosaic virus, which differed widely in their pathogenicity and other properties, were tested,...

A mutation abolishing photorepair has been localized to map position 56.8 centimorgans on the second chromosome of Drosophila melanogaster. Strains homozygous for the phr allele are totally devoid of photorepair and partially deficient in excision repair. Both defects map to the chromosomal region between pr and c. Since a homozygous phr stock exhibits reduced photoreactivation, the correspondi...

Pfefferkorn, E. R. (Harvard Medical School, Boston, Mass.), Boyce W. Burge, and Helen M. Coady. Characteristics of the photoreactivation of pseudorabies virus. J. Bacteriol. 92:856-861. 1966.-Pseudorabies virus, killed with ultraviolet light and then allowed to adsorb to chick embryo tissue culture cells, can be photoreactivated by light of longer wavelengths. The photoreactivable sector is app...

Photoreactivation of ultraviolet (UV) radiation damage to organisms has been demonstrated in many plant and animal phyla.1 In a few cases, this repair process has been shown to involve a light-dependent photoreactivating enzyme which monomerizes U1-induced pyrimidine dimers in DNA.2 3 However, the biological phenomenon of photoreactivation does not necessarily indicate the involvement of a phot...