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Current status of Potyvirus in India

Potyvirus particles are flexuous rods of 700–900 nm in length and contain one positive sense single-stranded genomic RNA molecule of approximately 10 kb, which is encapsidated by a single type of coat protein. According to available NCBI database, Potyvirus infection is prominently present in Solanaceae, Leguminosae and Cucurbitaceae families in India. Potyviruses can induce a wide range of different symptoms in infected host plants including mosaic, stripe, mottling, vein clearing, vein banding, ringspots, necrotic or chlorotic lesions, flower breaking, stunting, wilting, and most commonly lead tostunting and yield losses. PCR-based methods for the detection and identification of potyviruses rely on degenerate primers designed for conserved regions. Potyvirus infection requires the interaction of host factors with viral proteins and RNA for its replication and systemic spread, i.e interaction between VPg and eIF4E is required for Potyvirus genome translation. Mutations in host translational initiation factor eIF4E cause the conformational shift in encoded proteins which are unable to bind with viral protein (VPg), resulting in broad-spectrum Potyvirus resistance.