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Plants defend themselves from pathogen attack through an active immunity system composed by two phases. The first is mediated by cell surface and intracellular pattern recognition receptors (PRR), which recognizes conserved molecules derived from microbes known as pathogen-associated molecular patterns (PAMPs). This recognition triggers a defense response called PAMP-triggered immunity (PTI). Throughout evolution, pathogens were able to synthesize molecules capable of suppressing PTI. These molecules are named effectors and they are responsible for effector-triggered susceptibility (ETS). However, resistant plants can recognize effectors by intracellular resistance (R) proteins, initiating effector-triggered immunity (ETI). In general, responses derived from PTI and ETI are the same, but the latter is activated faster and is mediated by a single R gene. For this reason, ETI-response is also known as qualitative disease response (QDR) and plants do not develop disease symptoms, characterizing the incompatible interaction. On the other hand, PTI is mediated by several genes and the defense response is delayed, enabling the pathogen to spread out and to cause disease. This interaction is known as compatible. In defense responses, molecules like nitric oxide, polyamines and salicylic acid can participate in signaling process. The antioxidant system can be activated to quench the ROS effects and the plant metabolism is altered. In this sense, studying defense responses against pathogens can help to develop tools to establish effective control methods for plant disease.

Interação planta-patógeno: análises químicas em Solanum pimpinellifolium L. e Solanum lycopersicum \'VFNT\' infectadas pelo tomato mottle mosaic virus 