Asked May 3, 2019

Agrobacterium tumefaciens carries a _______ that enters dicotyledonous (dicot) plant cells, transforming the cells into tumor cells and causing crown gall disease.


Expert Answer

Step 1

It is required to identify the agent in Agrobacterium tumefaciens that enters dicotyledonous (dicot) plant cells, transforming the cells into tumor cells and causing crown gall disease.

Step 2

Agrobacterium is a genus of the bacteria which are composed of gram negative soil bacteria. The Agrobacterium causes plant diseases through horizontal gene transfer. The crown gall disease is caused by Agrobacterium tumefaciens. Gall formation takes place at the flesh wound site of the host plant from where the bacteria transfers its DNA to the host cell and itself gets incorporated in the genome of the host. This bacterial DNA insertion is responsible for the tumor formation in host plant.  

Step 3

The Agrobacterium tumefaciens have an extra piece of DNA termed as Ti plasmid which enters the plant cell and inserts itself into the chromosome of the plant. The Ti plasmid consists of several genes present on the integrate...

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