The following points highlight the seven important methods by which viruses are transmitted to plants. The methods are: 1. Transmission by Mechanical Means 2. Seed Transmission of Virus 3. Transmission by Vegetative Propagation 4. Transmission by Soil 5. Transmission by Pollen Grains 6. Transmission by Dodder 7. Transmission by Vectors. Method # 1. Transmission by Mechanical Means: Transmission by this [...]
The following points highlight the two main parts of virus particles according to Bawden and Pirie. The parts are: 1. Nucleoid 2. Capsid. Virus Particle: Part # 1. Nucleoid: It is present within the protein coat (Fig. 1). Each virus particle has only one type of nucleic acid either RNA or DNA. The viruses containing DNA are called Deoxyviruses and [...]
The following points highlight the two types of myxoviruses. The two types of myxoviruses are: 1. Orthomyxoviruses (Influenza Virus Type A, B, and C) Influenza and 2. Paramyxoviruses (Respiratory Infection; Mumps; Measles). Myxovirus Type # 1. Orthomyxoviruses (Influenza Virus Type A, B, and C) Influenza: Description: These viruses are spherical or filamentous. From the viral envelope project spikes or haemagglutinin [...]