| 摘要 |
Novel transgenic plants having the ability to express a functional 2-5A system, i.e., a 2-5A synthetase which produces 5'-phosphorylated, 2',5'-linked oligoadenylates (2-5A) in response to double-stranded RNA (dsRNA), and a 2-5A-dependent (RNase L), are disclosed. The novel transgenic plants expressing the functional 2-5A system, such as novel transgenic tobacco plants, are immune to and resistant against viral infection. When the novel transgenic tobacco plants are exposed to three different types of plant viruses, i.e., TMV, TEV and AIMV, such viral exposure leads to necrotic local lesions in such transgenic tobacco plants instead of typical systemic infections.
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