Virus-like particles in phloem tissue of chervil (Anthriscus cerefolium) infected with carrot red leaf virus

Isometric virus-like particles c. 22–25 nm in diameter were found in ultrathin sections of chervil leaves infected with carrot red leaf virus (CRLV). The particles were confined to the phloem and occurred in less than 5% of the cells in the vascular bundles. They were commonest in companion cells, occurred frequently in sieve elements and were also found in phloem parenchyma cells. The observations support other evidence that CRLV should be classified in the luteovirus group.