Abstract
Plant viral satellites are subviral parasites depending on helper viruses to complete their infectious cycle. In addition to enhancing our understanding of molecular virology, plant viral satellites are useful in the development and application of vector systems for two major purposes: (1) overexpression of foreign genes and (2) silencing of endogenous or foreign genes. These applications have greatly enhanced our understanding of plant and viral gene functions, and paved the way for the future development of biological control agents for plant viral diseases. In this chapter, various satellite-based vector systems are reviewed to highlight the advantages and limitations of such systems. The challenges and trends of satellite-based vector systems are also discussed.
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