Figura 2Prelecionista: Bianca Apolônio Fontes
Orientador: Fabrício de Ávila Rodrigues
Data: 25/10/2022, às 16h, no anfiteatro ESB

Resumo: In plants, active defense against pathogens involves the induction of elaborate defense signaling pathways. Some of these can provide protection at the site of infection (local), while others provide systemic resistance throughout the plant including in non-infected (distal) tissue. Systemic defense signaling mechanisms confer broad-spectrum resistance at the whole plant level and include systemic acquired resistance (SAR) and induced systemic resistance (ISR). The SAR is activated by plant resistance inducers (chemical agents, extracts from plants, and others) or pathogenic microbes and is dependent on salicylic acid (SA) signaling whereas ISR is induced by certain strains of plant growth-promoting rhizobacteria and non-pathogenic microbes and depends on the perception ethylene and jasmonic acid. The SA is one of the most important molecules involved in SAR and was one of the first to have its role as a resistance inducer revealed. From the discovery about the involvement of SA in the defense of plants against pathogens, studies trying to unravel the signaling pathways of this molecule and the systemic effect of inducing resistance began to be made. With the use of more modern techniques such as gas chromatography and the use of mutants of Arabidopsis, the origin of other SA-associated molecules in SAR signaling was discovered. After that, molecules such as azelaic acid, pipecolic acid, hexanoic acid, glycerol-3-phosphate, methyl-salicylate among others began to be researched in SAR signaling and were discovered as potential resistance inducers. Studies performed with hexanoic acid, glycerol-3-phosphate, and pipecolic acid showed that exogenous applications of these molecules were capable of inducing resistance of plants against different pathogens by inducing different defense reactions such as the production of PR proteins and antimicrobial compounds. These molecules have low toxicity to plants, have innovation/future market potential, and can be used in association with fungicides. Therefore, they can be visualized as good candidates to be used in the integrated plant disease management in the future.