Transgenic Plant
Transgenic plants with increased tolerance to aluminum have been produced by making plants that

make more metal-binding peptides like phytochelatins
secrete citrate into the soil
bind aluminum to the cell wall
secrete phytosiderophores into the soil

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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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