Unfortunately, there has been limited research on guanine/guanosine salvage cycles in plants and none of these
studies used Arabidopsis.
A recent, comprehensive study of guanosine metabolism in Catharanthus roseus cell cultures showed that guanosine is either recycled into guanine nucleotides or catabolized by conventional pathways to xanthine and allantoin, as occurs in animals and microorganisms.
Descriptions of several of these activities including guanine phosphoribosyltransferase, guanosine nucleosidase and gunanosine deaminase from various plant sources have been reported