ABSTRACT
In plant virus group family, Potyviridae represents the second largest family with single-strand positive sense RNA genome. They infect wide range of plants (monocotyledonous and dicotyledonous) such as fruits, vegetables, ornamental plants, and fiber crop those are now gradually being reported on new hosts of the tropical and subtropical regions of the world. They are characterized morphologically by filamentous virions (11 × 20 nm diameters) and contain either monopartite or bipartite linear single-strand positive sense, polygenic RNA (+RNA) genome of 9.3–10.0 kb in length. Among the family Potyviridae, viruses belonging to genus Potyvirus are most destructive. They are transmitted through aphid in nonpersistent and noncirculative manner. They cause diseases mainly in food, fiber, and ornamental plants. According to available database, potyvirus infection is more prevalent in crops belong to Solanaceae, Fabaceae, and Cucurbitaceae families. Infection of potyvirus produces different symptoms those were alike of other plant virus symptoms. Symptoms include mosaic, moteling, stipe, chlorosis, necrotic lesions, vein yellowing or vein clearing, stunting, and wilting, 410ultimately leading to quantitative yield loss. This review discusses the family Potyviridae, host range, and molecular biology of Potyvirus lifecycle. It also covers recent findings on the roles of potyviral proteins and its importance in successful disease incidence and progression.
