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

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

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

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

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