The following points highlight the life cycle of a typical plant virus such as TMV (Tobacco Mosaic Virus) which comprises of four stages. The stages are: 1. Transmission of Virus Particles (Virions) 2. Infection 3. Virus Multiplication 4. Sites of Viral RNA and Viral Protein Synthesis. Stage # 1. Transmission of Virus Particles (Virions): The rod-shaped Tobacco Mosaic Virus (TMV) [...]
In this article we will discuss about:- 1. Shape of Viruses 2. Microstructure of Viruses 3. Economic Importance 4. Affinities 5. Control of Diseases. Shape of Viruses: The shapes of virus particles or viruses are known chiefly from electron micrographs. The viruses may be spherical, rod like, brick-shaped B or shaped like a tadpole with a head and slender tail [...]
In this article we will discuss about:- 1. Introduction to Cyanophages 2. Distribution of Cyanophages 3. Nomenclature 4. Ultrastructure 5. Infection and Growth Cycle. Introduction to Cyanophages: Sufferman and Morris (1963) were the first to report the discovery of viral agent which attacks and lysis blue-green algae. Since then many more viruses have been found which attack a wide range [...]