Environmental biotic stress factors act continuously on plants, through multiple molecular
interactions that eventually lead to the establishment and progress of symbiotic or pathogenic complex
interactions. Proteins and peptides play noteworthy roles in such biological processes, usually being the
main effectors since the initial recognizing and elicitor functions until the following transduction, gene
regulation and physiological responses activities. Ranging from specific regulators to direct antimicrobial
agents, plant or pathogen proteins and peptides comprise the arsenal available to each side in this
biological war, resulting from the genetic coding potential inherited by each one. Post-translational
research tools have widely contributed with valuable information on how the plant proteome works to
achieve, maintain and adjust plant immunity in order to properly cope with the challenging pathogenic
derived proteomes. These key proteins and peptides have great biotechnological potential since they
represent distinctive features of each pathogen group (fungi, bacteria, viruses and other) in response to
molecules of defense of host plants.
Keywords: Post-translate mechanism, antimicrobial peptides, differential proteomics, two-dimensional electrophoresis, mass
spectrometry, elicitor, ROS.
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