The viroid responsible for cucumber pale fruit viroid (CPFV) infection in cucumbers is called the cucumber pale fruit viroid (CPFV). This viroid can cause symptoms such as yellowing, stunting, and distortion of leaves in infected plants.
Viroids are small circular RNA molecules that cause disease in plants, whereas prions are misfolded proteins that cause disease in animals. Viroids are composed of RNA, while prions are composed of protein. Prions replicate by inducing the misfolding of normal proteins, while viroids replicate using host cellular machinery.