Connections Map Overview

The Jasmonate Signaling Pathway in Arabidopsis

Science's STKE  07 Oct 2003:
Vol. 2003, Issue 203, pp. cm17
DOI: 10.1126/stke.2003.203.cm17


Jasmonates control defense gene expression and male fertility in the model plant Arabidopsis thaliana. In both cases, the involvement of the jasmonate pathway is complex, involving large-scale transcriptional reprogramming. Additionally, jasmonate signaling is hard-wired into the auxin, ethylene, and salicylate signal networks, all of which are under intense investigation in Arabidopsis. In male fertility, jasmonic acid (JA) is the essential signal intervening both at the level of anther elongation, as well as in pollen dehiscense. A number of genes potentially involved in jasmonate-dependent anther elongation have recently been discovered. In the case of defense, at least two jasmonates, JA and its precursor OPDA, are necessary for the fine-tuning of defense gene expression in response to various microbial pathogens and arthropod herbivores. However, only OPDA is required for full resistance to some insects and fungi. Other jasmonates probably affect yet more physiological responses. A series of breakthroughs have identified the SCFCOI1 complex, acting together with the COP9 signalsome, as a central regulatory component of jasmonate signaling in Arabidopsis. The studies, mostly involving mutational approaches, have paved the way for suppressor screens that are expected to further extend our knowledge of jasmonate signaling. When these and other new mutants affecting jasmonate signaling are characterized, new nodes will be added to the Connections Map, and the lists of target genes regulated by jasmonates in Arabidopsis will be expanded.

Science Viewpoint

R. Liechti, E. E. Farmer, The jasmonate pathway. Science 296, 1649-1650 (2002). [Abstract] [Full Text]