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

Mannitol
Nicotine
Sucrose
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

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

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