Abstract
Conventional plant breeding methods have been commonly used for introducing natural resistance genes into plants for controlling plant virus diseases. Introduction of one or more genes (transgene) from one to the other plant, which in many cases is not possible by conventional breeding methods because of sexual incompatibility, can also be done by plant transformation methods, based on DNA recombinant technology, to produce the transformed/transgenic plant. Such recombination techniques have proved very useful in several ways: they offer the possibility of genetic diversity, save time by avoiding cross-breeding, allow specific improvements in crops while preserving the desirable characteristics of an inbred line, and create novel types of resistance genes that do not occur in nature
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