Transgenic Plant
Which of the following compounds has been produced in transgenic plants to improve tolerance to salt stress and water deficit?

Sucrose
Mannitol
Nicotine
Octopine

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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

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
these proteins trigger the production of other antimicrobial defenses

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