The jasmonates (JAs) are a group of plant hormones which help regulate plant growth and development. Jasmonates include jasmonic acid and its esters, such as methyl jasmonate (MeJa). Like the related prostaglandin hormones found in mammals, the jasmonates are cyclopentanone derivatives which are derived biosynthetically from fatty acids. They are biosynthesized from linolenic acid by the octadecanoid pathway.
The level of JA in plants varies as a function of tissue and cell type, developmental stage, and in response to several different environmental stimuli. High levels of JA are also found in flowers and pericarp tissues of developing reproductive structures and in the chloroplasts of illuminated plants; JA levels also increase rapidly in response to mechanical perturbations such as tendril coiling and when plants suffer wounding.
Demonstrated roles of JA in planta include:
The perception of jasmonate is via the ubiquitin system, like auxins. After the conjugation of jasmonate and an amino acid isoleucine, it led to the SCFCOI1 complex degrade the ubiquitin markerd JAZ protein, and then releasing the transcription of other transcription factors.