Transgenic Plant
In transgenic plants that have been manipulated to express patho-genesis-related (PR) proteins all the time it has been shown that

expression of one PR protein provides high levels of protection against many pathogens
these proteins trigger the production of other antimicrobial defenses
expression of two PR proteins provides some protection against a few pathogens
these provide no protection at all against pathogens

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Transgenic Plant
Expression of antisense RNA in transgenic plants is a general method used to

reduce or eliminate the expression of individual genes
eliminate the expression of all genes in a biochemical pathway
block the expression of virus coat protein genes
activate the expression of all genes in a biochemical pathway

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