A plant will recognize a pathogenic invader
A)if it has many specific plant disease resistance (R)genes.
B)when the pathogen has an R gene complementary to the plant's antivirulence (Avr)gene.
C)only if the pathogen and the plant have the same R genes.
D)if it has the specific R gene that corresponds to the pathogen molecule encoded by an Avr gene.

Question

Quizplus · Accepted Answer

The plant will recognize a pathogenic invader if it has the specific R gene that corresponds to the pathogen molecule encoded by an Avr gene. This is known as the gene-for-gene hypothesis, which states that resistance of a plant to a specific pathogen is determined by the presence of a corresponding R gene that recognizes the pathogen's Avr gene product.

A Plant Will Recognize a Pathogenic Invader