Auxin contributes to jasmonate-mediated regulation of abscisic acid signaling during seed germination in Arabidopsis

• DOI: 10.1093/plcell/koac362
• Publication Date: 2022-12-14T21:24:06Z
• Authors: Song Mei; Minghui Zhang; Jingwen Ye; Jiancan Du; Yanjuan Jiang; Yanru Hu
• Keywords: Jasmonate; Jasmonic acid

Abscisic acid (ABA) represses seed germination and postgerminative growth in Arabidopsis thaliana. Auxin jasmonic (JA) stimulate ABA function; however, the possible synergistic effects of auxin JA on signaling underlying molecular mechanisms remain elusive. Here, we show that exogenous works synergistically with to enhance ABA-induced delay germination. biosynthesis, perception, are crucial for JA-promoted responses. The auxin-dependent transcription factors AUXIN RESPONSE FACTOR10 (ARF10) ARF16 interact JASMONATE ZIM-DOMAIN (JAZ) repressors signaling. ARF10 positively mediate JA-increased responses, overaccumulation partially restores hyposensitive phenotype JAZ-accumulating plants defective response combined treatment. Furthermore, physically associate ABSCISIC ACID INSENSITIVE5 (ABI5), a critical regulator signaling, ability JA-mediated responses is mainly dependent ABI5. activate transcriptional function ABI5, whereas JAZ antagonize their effects. Collectively, our results demonstrate contributes synergetic modulation explain mechanism by which ARF10/16 coordinate ABI5 integrate auxin, JA, pathways.