title: Induction of a polyubiquitin gene (ubi1) by potato phytoalexins and heat shock in Gibberella pulicaris.
abstract: Gibberella pulicaris, a causal agent of potato dry rot, infects potato tubers via wounds, where it is exposed to the phytoalexins rishitin and lubimin. Incubation of mycelium on agar supplemented with phytoalexins transiently induced the transcription of a polyubiquitin gene consisting of four ubiquitin units arranged head to tail; the fourth unit contains a 54-bp intron and an additional glutamine at the C-terminus of the encoded protein. Southern analysis of the G. pulicaris genome revealed one copy of the isolated polyubiquitin gene and one or two copies of other ubiquitin genes. Increased transcription of the gene was detectable above a threshold of 100 microg/ml of rishitin and at elevated temperatures, which indicates that exposure to phytoalexins causes a stress reaction of hyphal cells similar to that after heat shock.
authors.affiliation: Institut für Botanik, Universität Münster, Schlossgarten 3, D-48149 Münster, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Loser
authors.forename: K
authors.initials: K
authors.lastname: Weltring
mesh_terms: D000595:Amino Acid Sequence; D000890:Anti-Infective Agents / Q000494:pharmacology*; D000935:Antifungal Agents / Q000494:pharmacology; D001483:Base Sequence; D001704:Biopolymers / Q000235:genetics*; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D015966:Gene Expression Regulation, Fungal / Q000187:drug effects; D005800:Genes, Fungal / Q000235:genetics*; D005874:Gibberella / Q000737:chemistry / Q000187:drug effects* / Q000235:genetics; D006358:Hot Temperature; D008969:Molecular Sequence Data; D010936:Plant Extracts / Q000494:pharmacology*; D025821:Polyubiquitin; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012717:Sesquiterpenes; D011198:Solanum tuberosum / Q000737:chemistry; D013729:Terpenes; D014452:Ubiquitins / Q000235:genetics*; D000094162:Phytoalexins
chemical_list: D000890:Anti-Infective Agents; D000935:Antifungal Agents; D001704:Biopolymers; D018076:DNA, Complementary; D004271:DNA, Fungal; D010936:Plant Extracts; D012717:Sesquiterpenes; D013729:Terpenes; D014452:Ubiquitins; D025821:Polyubiquitin; C009188:rishitin; D000094162:Phytoalexins