Phytoalexins are antimicrobial and often antioxidative substances synthesized de novo by plants that accumulate rapidly at areas of pathogen infection. They are broad spectrum inhibitors and are chemically diverse with different types characteristic of particular plant species. Phytoalexins tend to fall into several classes including terpenoids, g...
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http://en.wikipedia.org/wiki/Phytoalexin
A low molecular weight, antimicrobial compound synthesized by and accumulating in higher plants exposed to certain microorganisms (pathogenic and nonpathogenic).
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http://ppathw3.cals.cornell.edu/glossary/Defs_P.htm
<protein> Toxic compounds produced by higher plants in response to attack by pathogens and to other stresses. Sometimes referred to as plant antibiotics, but rather non-specific, having a general fungicidal and bacteriocidal action. ... Very much analogous to an antibody response as production is triggered by elicitors. ... Examples include: ...
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http://www.encyclo.co.uk/local/20973
phytoalexin Any substance that is produced by plant tissues in response to contact with a parasite and specifically inhibits the growth of that parasite. The term was originally defined with regard to fungal parasites only, but in 1956 it was extended to cover all parasites [According to the Oxford English Dictionary].
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http://www.wordinfo.info/words/index/info/view_unit/1663/12
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