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

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

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

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Transgenic Plant
Low temperatures induce the expression of many cold-induced genes. Transgenic plants with improved cold tolerance have been produced by

increasing evaporative cooling from leaf surfaces
cooling plants using the Peltier effect
expressing the protein that activates expression of these genes all the time in plants
expressing a gene for production of antifreeze (ethylene glycol) in plants

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