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Q.
The first transgenic crop was
Biotechnology and its Applications
Solution:
Transgenic plants are those plants in which a foreign
gene has been introduced and stably integrated into host DNA.
The first transgenic plants were produced in tobacco (Nicotiana
tabacum). A gene resistant to PPT (L-phosphinothricin),
an active ingredient o f herbicide ‘basta’, was isolated from
Medicago sativa. It inhibits the enzyme GS (Glutamine
synthase) which is involved in ammonia assimilation. This
gene resistant to PPT was incorporated into tobacco, as a result
of which transgenic tobacco was produced which was resistant
to PPT