poleroviruses

Poleroviruses are a genus of plant RNA viruses that infect a wide range of crop and wild angiosperms. They are phloem-limited, non-enveloped particles with icosahedral symmetry and a positive-sense single-stranded RNA genome roughly 5.6–6.0 kilobases long. Genomes are compact and highly organized, with multiple overlapping open reading frames that encode a coat protein (often expressed as a readthrough product required for aphid transmission), movement functions, replication proteins and factors that interfere with host RNA silencing.

Transmission is primarily persistent, circulative via aphid vectors, and plant-to-plant spread depends on vector presence and feeding behavior. Infected plants commonly show symptoms such as yellowing, phloem necrosis, stunting, reduced vigor and yield losses; however, many infections can be latent or produce variable symptoms depending on host species and environmental conditions.

Diagnosis relies on serological tests, RT-PCR and high-throughput sequencing, supported by biological indexing and electron microscopy for particle observation. Management emphasizes integrated strategies: control of aphid vectors, use of resistant or tolerant cultivars, certified virus-free seed and planting material, crop rotation, and removal of infected plants. Poleroviruses are of economic concern in many agricultural systems worldwide because of their impact on staple and specialty crops and their efficient aphid-mediated spread. Ongoing research focuses on virus–vector interactions, host resistance mechanisms and improved diagnostic and management approaches.