Transgenic Plant
Reducing the expression of pectin methylesterase (PME) has resulted in

tomato juice that has higher viscosity
plants with resistance to bacteria and fungi
tomato fruit that will not ripen
tomato fruit that last longer before they become rotten

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

any of the above
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 the coat proteins of virulent strain
inoculating the susceptible strain with genes of nucleocapsid

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

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