After mutagenesis, the bacteria Sinorhizobium meliloti became unable to colonize Medicago truncatula plants due to the absence of recognition by the host plant. Which of the following genes is most likely the site of mutation?

Question

Quizplus · Accepted Answer

Nod factors are signaling molecules produced by bacteria to initiate symbiotic relationships with plants. If the mutation occurred in the gene responsible for producing Nod factors, then the bacteria would not be recognized by the plant and would not be able to colonize it. Peptidoglycans, leghemoglobin, and nitrogenase are not directly involved in the recognition process, and flavonoid-synthesizing enzymes are produced by the plant, not the bacteria.

After Mutagenesis, the Bacteria Sinorhizobium Meliloti Became Unable to Colonize