Jasmonic acid regulates lignin deposition in poplar through JAZ5-MYB/NAC interaction.

ABSTRACT: Jasmonic acid (JA) is a phytohormone involved in plant defense, growth, and development, etc. However, the regulatory mechanisms underlying JA-mediated lignin deposition and secondary cell wall (SCW) formation remain poorly understood. In this study, we found that JA can inhibit lignin deposition and SCW thickening in poplar trees through exogenous MeJA treatment and observation of the phenotypes of a JA synthesis mutant, opdat1. Hence, we identified a JA signal inhibitor PtoJAZ5, belonging to the TIFY gene family, which is involved in the regulation of secondary vascular development of Populus tomentosa. RT-qPCR and GUS staining revealed that PtoJAZ5 was highly expressed in poplar stems, particularly in developing xylem. Overexpression of PtoJAZ5 inhibited SCW

SUBMITTER: Zhao X 

PROVIDER: S-EPMC10401599 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature