[Campbell Biology P.916] Which molecule is directly responsible for activating systemic acqu... | Practice Question

Which molecule is directly responsible for activating systemic acquired resistance SAR in plant tissues remote from the initial infection site?

  • A: Effectors
  • B: Methylsalicylic acid
  • C: Salicylic acid
  • D: PAMPs

Explanation

Methylsalicylic acid, produced at the infection site, is transported through the phloem and then converted to salicylic acid in remote areas. This salicylic acid directly activates the signal transduction pathway leading to systemic acquired resistance SAR .