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

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

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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 with genes of nucleocapsid
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

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