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Acosta, I. F.; Gasperini, D.; Chételat, A.; Stolz, S.; Santuari, L.; Farmer, E. E. Role of NINJA in root jasmonate signaling Proc Natl Acad Sci USA 110, 15473-15478, (2013) DOI: 10.1073/pnas.1307910110
Wound responses in plants have to be
coordinated between organs so that locally reduced growth in a wounded
tissue is balanced by appropriate growth elsewhere in the body. We used a
JASMONATE ZIM DOMAIN 10 (JAZ10) reporter to screen for mutants affected
in the organ-specific activation of jasmonate (JA) signaling in
Arabidopsis thaliana seedlings. Wounding one cotyledon activated the
reporter in both aerial and root tissues, and this was either disrupted
or restricted to certain organs in mutant alleles of core components of
the JA pathway including COI1, OPR3, and JAR1. In contrast, three other
mutants showed constitutive activation of the reporter in the roots and
hypocotyls of unwounded seedlings. All three lines harbored mutations in
Novel Interactor of JAZ (NINJA), which encodes part of a repressor
complex that negatively regulates JA signaling. These ninja mutants
displayed shorter roots mimicking JA-mediated growth inhibition, and
this was due to reduced cell elongation. Remarkably, this phenotype and
the constitutive JAZ10 expression were still observed in backgrounds
lacking the ability to synthesize JA or the key transcriptional
activator MYC2. Therefore, JA-like responses can be recapitulated in
specific tissues without changing a plant’s ability to make or perceive
JA, and MYC2 either has no role or is not the only derepressed
transcription factor in ninja mutants. Our results show that the role of
NINJA in the root is to repress JA signaling and allow normal cell
elongation. Furthermore, the regulation of the JA pathway differs
between roots and aerial tissues at all levels, from JA biosynthesis to
transcriptional activation.