Induction of Jasmonoyl-Isoleucine (JA-Ile)-Dependent JASMONATE ZIM-DOMAIN (JAZ) Genes in NaCl-Treated Arabidopsis thaliana Roots Can Occur at Very Low JA-Ile Levels and in the Absence of the JA/JA-Ile Transporter JAT1/AtABCG16

The plant hormone jasmonoyl-isoleucine (JA-Ile) is an important regulator of plant growth and defense in response to various biotic and abiotic stress cues. Under our experimental conditions, JA-Ile levels increased approximately seven-fold in NaCl-treated roots. Although these levels were around 10...

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Bibliographic Details
Published in:Plants (Basel) 2020-11, Vol.9 (12), p.1635
Main Authors: Thurow, Corinna, Krischke, Markus, Mueller, Martin J, Gatz, Christiane
Format: Article
Language:English
Subjects:
allene oxide synthase
Arabidopsis thaliana
Biosynthesis
Coronatine
CORONATINE INSENSITIVE 1
Gene expression
Genes
Isoleucine
JA/JA-Ile transport protein JAT1
Jasmonic acid
jasmonoyl-isoleucine
Ligands
Metabolites
Plant growth
Proteins
Roots
Salt
Signal transduction
Sodium chloride
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Summary:The plant hormone jasmonoyl-isoleucine (JA-Ile) is an important regulator of plant growth and defense in response to various biotic and abiotic stress cues. Under our experimental conditions, JA-Ile levels increased approximately seven-fold in NaCl-treated roots. Although these levels were around 1000-fold lower than in wounded leaves, genes of the JA-Ile signaling pathway were induced by a factor of 100 or more. Induction was severely compromised in plants lacking the JA-Ile receptor CORONATINE INSENSITIVE 1 or enzymes required for JA-Ile biosynthesis. To explain efficient gene expression at very low JA-Ile levels, we hypothesized that salt-induced expression of the JA/JA-Ile transporter would lead to increased nuclear levels of JA-Ile. However, mutant plants with different alleles were similar to wild-type ones with respect to salt-induced gene expression. The mechanism that allows COI1-dependent gene expression at very low JA-Ile levels remains to be elucidated.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants9121635