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COS1: An Arabidopsis coronatine insensitive1 Suppressor Essential for Regulation of Jasmonate-Mediated Plant Defense and Senescence

^a Laboratory of Plant Signal Transduction, Institute of Molecular and Cell Biology, National University of Singapore, 117604 Republic of Singapore
^b School of Plant Protection, Hunan Agricultural University, Changsha, 410128 China
^c Department of Biological Sciences, National University of Singapore, 117604 Republic of Singapore

¹ To whom correspondence should be addressed. Email daoxin{at}imcb.a-star.edu.sg; fax 65-68727517.

The Arabidopsis thaliana CORONATINE INSENSITIVE1 (COI1) gene encodes an F-box protein to assemble SCF^COI1 complexes essential for response to jasmonates (JAs), which are a family of plant signaling molecules required for many essential functions, including plant defense and reproduction. To better understand the molecular basis of JA action, we screened for suppressors of coi1 and isolated a coi1 suppressor1 (cos1) mutant. The cos1 mutation restores the coi1-related phenotypes, including defects in JA sensitivity, senescence, and plant defense responses. The COS1 gene was cloned through a map-based approach and found to encode lumazine synthase, a key component in the riboflavin pathway that is essential for diverse yet critical cellular processes. We demonstrated a novel function for the riboflavin pathway that acts downstream of COI1 in the JA signaling pathway and is required for suppression of the COI1-mediated root growth, senescence, and plant defense.

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