Question

Production of virus free plants biology discussion

Answer 1

Answer:

Explanation:

Tumour means uncontrolled growth or proliferation of dis-organised tissues. After its initiation the tumour can grow even in absence of the inciting agent, such as, virus, bacteria, chemical substances etc. Braun (’42) studied plant tumours.

Later various scientists induced tumours on susceptable plants by introducing Agrobacterium tumefaciens through wounds. The tumour inducing substance of this bacterium is a small T-DNA or Ti plasmid. It occurs only in the virulent strains of A. tumefacians. Three types of tumours are usually studied in vitro.