Transgenic Plant
Cross protection against viruses in transgenic plants can be obtained by

inoculating the susceptible strain with the coat proteins of virulent strain
inoculating the susceptible strain of a crop with a mild strain of a virus that helps in developing resistance against more virulent strain
any of the above
inoculating the susceptible strain with genes of nucleocapsid

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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
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
cooling plants using the Peltier effect

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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

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

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