Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Production of Disease-free Plants
Under normal conditions plants are infected by a wide range of pathogens such as bacteria, fungi, viruses, viroids, and insects like nematodes and insects. Many perennial plants and those propagated by vegetative means are systematically infected with one or more pathogens, which reduce yield, vigour and quality of the plant. If explants for micropropagation are derived from an infected plant, the pathogens can multiply and spread to a large number of plants.
It is, therefore, essential to use disease free stock plants for micropropagation. Eradication of viruses and other pathogens is also desirable from the point of view of international exchange of plant materials. Whereas bacteria and fungi present on the surface of the plant material can be easily eliminated by treatment with surface sterilizing agents, there is no dependable treatment against viruses. Viruses can multiply within the shoots in-vitro without symptoms. Traditionally, thermotherapy has been used for virus elimination but it is not effective against all viruses. Moreover, heat treatment may adversely affect the plant tissues. For some reasons viruses are unable to enter or survive in the apical meristems. Therefore, even in infected plants the apical meristems are generally free of viruses. Taking advantage of this observation, Morel (1950) developed the technique of shoot tip culture to raise virus-free plants from infected individuals. Since then it has become the most effective method of virus elimination. It involves excision of 0.5-1 mm long shoot tips, including apical meristem and one or two leaf primordia and their cultivation on a suitable medium to regenerate whole plants.
RESPIR A TIO N IN INSECT (COCKROACH) - Respiration is direct. So metabolic rate is high. This system is related to each cell of the body so respiratory pigment is ab
what is known as respiration in animals?
Define the control of tear production. Control of Tear Production The lacrimal secretary system was initially thought to be comprised of two parts, basic secretors and r
LIVE R (HEPAR) - Largest gland of body. Weighing 1.6 kg. Form 1/40 of the body weight. Bio-chemical laboratory. Bussiest part in whole river of life. Dark reddish brown
What do enzymes do, and how? How is enzyme activity regulated in cells? How do ATPases u se ATP to make reactions go?
Q. What is viscosity? Viscosity is resistance to flow of a liquid. It is a measure of the resistance of a fluid to deformation under shear stress. It is commonly perceived as "
Why are the tropical forests also known as stratified forests? In the tropical forests tall trees of several species have their crowns forming a superior layer under which dive
What do you understand by Heterotrophic? Organisms which are not capable of converting light into chemical energy. They should consume other organisms or material produced by o
Formation of Blastopore The slit such as opening of the initial groove is the opening of the developing blastopore and its dorsal rim is termed as the dorsal lip of blastopor
Q. Measurement of Colour in Foods? A number of instruments are used for colour measurements in food. a) A simple method is to match the colour of a food with coloured chips
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd