Differential regulation of jasmonate responses in multiple jaz mutants

Abstract

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 jaz mutants of the phylogenetic group I ( jaz1/2/5/6 ), group II/III ( jaz10/11/12 ), group IV/V ( jaz3/4/7/9 and jaz3/4/7/8/9 ), and their high-order mutant jaz1/2/3/4/5/6/7/9/10/11/12 . Here, we examined JA-regulated root growth, apical hook curvature, flowering time, and defense against the insect Spodoptera exigua in the intermediate jaz mutants jaz1/2/5/6/10/11/12, jaz1/2/3/4/5/6/7/9 , and jaz3/4/7/8/9/10/11/12 . This study shows that these jaz mutants differentially affect JA responses, suggesting the complexity of JA pathway in these multiple jaz mutants.

Comparative Transcriptome and Interaction Protein Analysis Reveals the Mechanism of IbMPK3-Overexpressing Transgenic Sweet Potato Response to Low-Temperature Stress

“…Exogenous JA can effectively enhance low temperature tolerance in plants. Jasmonate ZIM-domain protein ( JAZ1/2 ) is a key regulator factor in the JA signaling response pathway [ 54 ]. The receptor coronatine insensitive 1( COI1 ) senses the JA signaling molecule, binds with substrate JAZ, and then ubiquitinates JAZ [ 55 ].…”

A molecular framework for signaling crosstalk between jasmonate and ethylene in anthocyanin biosynthesis, trichome development, and defenses against insect herbivores in Arabidopsis

“…They repress and regulate diverse JA responses. The strong decuple mutant jaz1‐2 / 2‐3 / 3‐4 / 4‐1 / 5‐1 / 6‐4 / 7‐1 / 9‐4 / 10‐1 / 13‐1 (Guo et al, 2018) and the weak undecuple mutant jaz1‐1/2‐2/3‐5/4‐1/5‐1/6‐5/7‐1/9‐1/10‐1/11‐1/12‐1 (Liu et al, 2021; Zhang et al, 2022) are late flowering and overly sensitive to JA in terms of root growth. They exhibit defective apical hook formation, reduced rosette growth, increased defenses against insects, and increased resistance to the necrotrophic fungus Botrytis cinerea .…”