Transgenic Plant
What are the various disadvantages of cross protection?

All of these
Possibility of mutations in inducing mild virus strain
Possibility of unnecessary spread of mild virus
Possibility of synergism between inducing virus and other unrelated virus

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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

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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