• Pararetroviruses and Reverse Transcription in Plant Viruses:
• Caulimoviridae: Plant pararetroviruses (such as Cauliflower mosaic virus, CaMV) possess a circular double-stranded DNA genome with discontinuous site-specific gaps. They replicate through an RNA intermediate using reverse transcriptase and accumulate dense, proteinaceous cytoplasmic inclusion bodies (viroplasms).
• Reoviridae (Plant Reoviruses): Viruses in the family Reoviridae (e.g., Fiji disease virus, Rice ragged stunt virus) contain segmented double-stranded RNA (dsRNA) genomes. They replicate using their own virion-associated RNA-dependent RNA polymerase (RdRp) by a conservative transcription mechanism, completely independent of reverse transcription.
• Conclusion: Reoviridae does NOT replicate via reverse transcription (Option 2).

Correct option: (2) Reoviridae

• Host Cellular Factors in Plant RNA Virus Replication:
• Replication Requirements: Positive-sense RNA viruses utilize host translation factors (e.g., eEF1A, eIF4E, eIF4G), host molecular chaperones (Hsp70, Hsp90), and host RNA-binding proteins to assemble membrane-bound viral replication complexes (VRCs) on organelles.
• DNA Gyrase: DNA gyrase is a bacterial type II topoisomerase that introduces negative supercoils into double-stranded circular bacterial DNA. It has no role in plant cells or the cytoplasmic replication cycle of plant RNA viruses.
• Conclusion: Host gyrases are NOT involved in RNA virus replication (Option 4).

Correct option: (4) Host gyrases