Why is hydrilla resistant to fluridone?

Hydrilla's resistance to fluridone is primarily due to mutations in the pds gene, which is responsible for a specific enzyme involved in the synthesis of carotenoids. Fluridone works by inhibiting the production of this enzyme, leading to a halt in the growth of the plant. However, the mutations in the pds gene can alter the site where fluridone acts, decreasing the herbicide's effectiveness. As a result, the plant can continue to grow despite the presence of fluridone, demonstrating a clear case of genetic resistance.

By understanding how hydrilla’s genetic makeup contributes to its resistance, those managing aquatic environments can better strategize control measures against this invasive species. This knowledge is essential for developing more effective treatment plans that might involve alternative herbicides or different management practices that target specific pathways less affected by such mutations.