02106naa a2200253 a 450000100080000000500110000800800410001902200140006010000260007424501150010026000090021552013470022465000110157165300290158265300190161165300260163070000230165670000210167970000190170070000140171970000200173370000150175377300840176816546522023-07-24       2007    bl uuuu     u00u1 u    #d  a1415-47571 aGUIDETTI-GONZALEZ, S.  aGenes associated with hypersensitive response (HR) in the citrus EST database (CitEST).h[electronic resource]  c2007  aPlants are continuously exposed to pathogen attack, but successful infection is rare because they protect themselves against pathogens using a wide range of response mechanisms. One of them is the hypersensitive response (HR), which is a form of cell death often associated with plant resistance to pathogen infection to prevent the spreadsebpg@cnpq.br sebpg@cnpq.br of the potential pathogen from infected to uninfected tissues. Cell death is activated by recognition of pathogen-derived molecules by the resistance (R) gene products, and is associated with the massive accumulation of reactive oxygen species (ROS), salicylic acid (SA), and other pro-death signals such as nitric oxide (NO). The analysis of the citrus EST (CitEST) database revealed the presence of putative genes likely to be involved in HR through their products, like metacaspases, lipoxygenases, phospholipases, pathogenesis-related proteins, glutathione transferases/peroxidases, enzymes involved in the phenylpropanoid pathway and in the formation and detoxification of ROS, as well as those involved in the formation and regulation of ion channels, SA and NO. By analysis of the EST database of Citrus, it was possible to identify several putative genes that code for key enzymes involved in HR triggering and also in plant defense against biotic and abiotic stress.  aStress  aPlant disease resistance  aPlant-pathogen  aProgrammed cell death1 aFREITAS-ÁSTUA, J.1 aAMARAL, A. M. do1 aMARTINS, N. F.1 aMEHTA, A.1 aSILVA, M. S. S.1 aCARRER, H.  tGenetics and Molecular Biology, Ribeirão Pretogv. 30, n. 3, p. 943-967, 2007.