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

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

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

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