Activation of a COI1-dependent pathway inArabidopsisbyPseudomonas syringaetype III effectors and coronatine

COI1 is a critical component of a receptor for jasmonate and the bacterial virulence factor coronatine.

Jasmonate (JA) is a lipid-derived hormone that regulates diverse aspects of plant immunity and development. An amino acid-conjugated form of JA, jasmonoyl-isoleucine (JA-Ile), stimulates binding of the F-box protein coronatine-insensitive 1 (COI1) to, and subsequent ubiquitin-dependent degradation of, jasmonate ZIM domain (JAZ) proteins that repress transcription of JA-responsive genes. The vir...

Coronatine-Insensitive 1 (COI1) Mediates Transcriptional Responses of Arabidopsis thaliana to External Potassium Supply

The ability to adjust growth and development to the availability of mineral nutrients in the soil is an essential life skill of plants but the underlying signaling pathways are poorly understood. In Arabidopsis thaliana, shortage of potassium (K) induces a number of genes related to the phytohormone jasmonic acid (JA). Using comparative microarray analysis of wild-type and coi1-16 mutant plants...

Differential expression of a novel gene in response to coronatine, methyl jasmonate, and wounding in the Coi1 mutant of Arabidopsis.

Coronatine is a phytotoxin produced by some plant-pathogenic bacteria. It has been shown that coronatine mimics the action of methyl jasmonate (MeJA) in plants. MeJA is a plant-signaling molecule involved in stress responses such as wounding and pathogen attack. In Arabidopsis thaliana, MeJA is essential for pollen grain development. The coi1 (for coronatine-insensitive) mutant of Arabidopsis, ...

Pseudomonas type-III effectors

Resistance to Pseudomonas syringae conferred by an Arabidopsis thaliana coronatine-insensitive (coi1) mutation occurs through two distinct mechanisms.

A new allele of the coronatine-insensitive locus (COI1) was isolated in a screen for Arabidopsis thaliana mutants with enhanced resistance to the bacterial pathogen Pseudomonas syringae. This mutant, designated coi1-20, exhibits robust resistance to several P. syringae isolates but remains susceptible to the virulent pathogens Erisyphe and cauliflower mosaic virus. Resistance to P. syringae str...