Exploitation of plant viruses as transformation vectors by massive infection may be harmful and even deleterious to the target plants. It is still however able to express and produce foreign proteins. Plant viruses must exhibit some of the exemplary features before they are considered as vectors. They should extend their broader host-range, spread of seed transmission and carry additional copies [...]
In this article we will discuss about:- 1. Origin of Viroid 2. Meaning of Viroids 3. Viroid Genome 4. Replication. Origin of Viroid: So far no sufficient information is available that can lend support for the origin of viroids. Following are some of the speculations regarding the origin of viroids: (a) Viroids are supposed to be the primitive viruses and [...]
The following points highlight the eight main serological tests which helps in rapid diagnosis of plant viruses. The tests are: 1. Histochemical Test by Immunofluorescence 2. Agar Gel Double Diffusion Test 3. Direct Antigen-coated ELISA 4. Double Antibody Sandwich ELISA 5. Indirect Double Antibody Sandwich ELISA 6. Detection of Virus by Nucleic Acid Spot Hybridisation (NASH) using DNA Probe and [...]