A novel ABA structural analogues enhanced plant resistance by inducing the plant immunity and inactivating ABA signaling pathway

Abstract

Abscisic acid (ABA) is a phytohormone that not only important for plant growth, but also mediating the stress response. The roles of ABA in plant immunity are especially multifaceted. Recently, the ABA functional analogues are of great significance to promote its application. Here, we reported an ABA functional analogue named 167A. 167A inhibits plant growth and seeds germinating of Arabidopsis. Meanwhile, the 167A enhanced the plant immunity, which is opposite of ABA. We further investigated the PTI-response after 167A treatment, and the results show that the ROS burst, callose deposition accumulate with 167A treatment. Moreover, 167A also influence the degree of stomal closed. RNA-seq assays show that the 167A down-regulated the ABA associated genes and up-regulated the JA/SA/ET associated genes. Through genetic analysis, the 167A modulating the plant resistance through the PYR/PYL Receptors. Together, these results demonstrate that a novel ABA analogue 167A positive regulated plant immunity and has great potential for agricultural applications.