A fungus infection occurs in the leaves of a plant.This triggers a variety of immune responses,including the production of salicylic acid,which then travels to other parts of the plant.These parts of the plant are later resistant to infection by other fungi.The plant is showing the results of
A) specific immunity. B) constitutive defenses. C) hypersensitive response. D) systemic acquired resistance. E) gene-for-gene resistance.
A specific immune response triggered by a pathogen involves several steps.Which of these steps occurs first?
A) R proteins trigger specific immune responses. B) PR proteins signal cells that have not yet been attacked. C) Effector binds to cytoplasmic receptor (R protein)inside the cell. D) Signaling molecules in the cell trigger production of defensive molecules. E) Substances are produced to strengthen the cell wall and block plasmodesmata.