Biology B6 (15)

Detecting plant diseases and plant defences 

in the field plant diseases are usually detected by observations 

growths might inidicate crown gall disease or mottling of leaves might mean the plants has tobacco mosaic diseases

in the lab...

elisa test

antigens are unique molecules on the surface of cells. they can be detected by using antibodies proteins that bind to specific antigens 

antigens from a pathoegn will be present in a plnat infected with that pathogen

in an ELISA test antibodies ofr the pathogens antigens are used these antibodies ahve enzymes attached to them which can react with a substrate causing a colour chnage 

the anitibodies added to the sample being tested and are then washed off but if the antibodies bind…