Production of disease-free plants, Biology

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.

Posted Date: 1/24/2013 5:24:44 AM | Location : United States







Related Discussions:- Production of disease-free plants, Assignment Help, Ask Question on Production of disease-free plants, Get Answer, Expert's Help, Production of disease-free plants Discussions

Write discussion on Production of disease-free plants
Your posts are moderated
Related Questions
Which is the brain region responsible for the coordination and equilibrium of the body? In the central nervous system the cerebellum is the main controller of the motor coordin

Monosaccharides are frequently known as single or simple sugars and are the easiest of all carbohydrates. That is the building blocks of all higher carbohydrates. The Monosacchari

Fate of Blastopore Cleavage results in the formation of a ball of cells called morula (resembling mulberry hence the name). A space appears in the morula changing it to a holl

Convulsive Disorders Definition Convulsion is a series of forceful in voluntary contraction and relaxation of voluntary muscles due to disturbance of brain function. It i

Explain Diabetic  diets Diabetic  diets :  There  are  therapeutic modification  in  the  quantity1 quality of  various macronutrients  particularly carbohydrates.

Q. Explain microbiology of water? Ans. Unlike air, natural waters contain their natural flora, as well as, microorganisms from soil and possibly from animals and se

notochotr is absent in the group ...........

What is Ceramics A kind of material that is "bone like" based on the specific ratios of calcium and phosphorous in particular crystalline structures. Ceramics are inorganic, no

Q. What is the part of the female reproductive system where fecundation occurs? Fecundation in general occurs in the Fallopian tubes but it can also take place within the uteru

What in Genetics is hybridization? The Hybridization in Genetics is the crossing of individuals from "pure" and different lineages in relation to a given trait that is the cros