Repressor of jasmonate (JA) responses. Forms a ternary complex with RSS3 and BHLH94 to negatively regulate JA-responsive genes (PubMed:23715469). Acts as positive regulator of tolerance to salt stress (PubMed:19618278, PubMed:25617318). Involved in salt tolerance by modulating potassium homeostasis through JA signaling and regulation of the expression of potassium ion transporter genes. Acts as a transcriptional regulator targeted by the SCF(COI1) E3 ubiquitin ligase complexes in the JA signaling pathway, and interacts with BHLH062 that may directly regulate the ion transporter genes (PubMed:25617318). Acts as positive regulator of tolerance to dehydration stress (PubMed:19618278). Acts as negative regulator of tolerance to cold stress by interacting with MYB30 (PubMed:28062835). Interacts with BHLH148 (PubMed:21332845). Interacts with COI1A in a coronatine-dependent manner (PubMed:23320078, PubMed:25617318). Interacts with COI1B in a coronatine-dependent manner (PubMed:23320078). Coronatine is an analog of jasmonoyl isoleucine (JA-Ile) (PubMed:23320078). Interacts with RSS3. Forms a ternary complex with RSS3 and BHLH094 in the nucleus (PubMed:23715469). Interacts with BHLH062 and NINJA1 (PubMed:25617318). Interacts with MYB30 (PubMed:28062835). By jasmonate, wounding, and cold, drought and salt stresses. Down-regulated by abscisic acid (ABA). The jas domain (115-140) is required for interaction with COI1. Ubiquitinated. Targeted for degradation by the SCF(COI1) E3 ubiquitin ligase-proteasome pathway during jasmonate signaling. Plants over-expressing TIFY11A/JAZ9 display increased tolerance to salt and dehydration stresses (PubMed:19618278). Plants silencing TIFY11A/JAZ9 exhibit decreased tolerance to salt stress (PubMed:25617318). Plants over-expressing TIFY11A/JAZ9 display decreased tolerance to cold stress (PubMed:28062835). Belongs to the TIFY/JAZ family.