Question

Which of the following statements about systemic acquired resistance (SAR) in plants is false?

a. Hormones produced by an attacked leaf carry a signal to the rest of the plant.
b. A suite of genes called the pathogenesis-related loci is expressed in response to a signal from an attacked leaf.
c. Salicylic acid is the only compound involved in SAR signaling.
d. SAR results in the production of protective compounds distant from the site of initial infection.

Answer 1

Salicylic acid is not the only compound involved in systemic acquired resistance (SAR) signaling in plants. Other compounds such as methyl salicylate, peptide, lipid derivatives, and azelaic acid can also serve as translocating signal molecules in SAR.

Step-by-step explanation:

The false statement about systemic acquired resistance (SAR) in plants is that salicylic acid is the only compound involved in SAR signaling. While salicylic acid is an important signaling compound for SAR, other compounds such as methyl salicylate, peptide, lipid derivatives, and azelaic acid can also serve as translocating signal molecules in SAR. SAR involves various signaling compounds, and while salicylic acid is a key player, other signaling molecules such as jasmonic acid and ethylene also play crucial roles in the induction and regulation of SAR.