Viroid

•Naked ssRNA Plant Pathogen

•NA devoid of protein coat

•2 types of Viorid families are Avsunviroidae & Pospiviroidae

•Replicated with the enzyme is ?

•Viroids are classified based on CCR (Central Conserved Region)

•Smallest viroid – Coconut Cadang Cadang viroid (Monocot viroid) (247 nt)

•Largest viroid – Chrysanthemum Chlorotic Mottle viroid  (401 nt)

•First Viroid – Potato Spindle Tuber Viroid  (357 nt)