Differential regulation of jasmonate responses in multiple mutants.

The phytohormones jasmonates (JAs) regulate diverse aspects of plant growth and defense responses. The JA-ZIM domain (JAZ) family of repressors are targeted by the JA receptor Coronatine Insensitive 1 for ubiquitination and subsequent degradation via the 26S proteasome. We previously investigated the functions of JAZs in JA responses by analyzing mutants of the phylogenetic group I (), group II/III (), group IV/V ( and ), and their high-order mutant . Here, we examined JA-regulated root growth, apical hook curvature, flowering time, and defense against the insect in the intermediate mutants , and . This study shows that these mutants differentially affect JA responses, suggesting the complexity of JA pathway in these multiple mutants.