How does SA signaling link the Flg22 responses?

摘要

Slicylic acid (SA) has a central role inactivating plant resistance to patho-gens. SA levels increase in plant tissuefollowing pathogen infection and exoge-nous SA enhances resistance to a broadrange of pathogens. To study the rele-vance of the SA signaling in the flg22response, we investigated the responsesof SA-related mutants to flg22, a 22-amino acid peptide of the flagellin bacte-rial protein. We identified SA as animportant component of the flg22-trig-gered oxidative burst, a very early eventafter flg22 detection, and gene induction,an early event. SA acted partially byenhancing accumulation ofFLS2mRNA. We also provide new evidencethat NPR1 play a role in SA-inducedpriming event that enhances the flg22-triggered oxidative burst, which is corre-lated with enhancement of the flg22-induced callose deposition. Based onthese observations, we conclude that SAsignaling is required for early as well aslate flg22 responses.