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1887

Journal of General Virology header logo - Volume 61, Issue 1, 1982

Volume 61, Issue 1

Volume 61, Issue 1, 1982

  • Plant

      • Comparative Cytology of Two Isolates of Cauliflower Mosaic Virus

        https://doi.org/10.1099/0022-1317-61-1-75
        SUMMARY

        The cytology of Cabb-S and Cabb-D/H isolates of cauliflower mosaic virus (CaMV) was compared by electron microscopy. In turnips ( L. cv. ‘Just Right’) the two strains induced similar symptoms. In the Cabb-S infected cells the viroplasms contain large amounts of electron-dense material and small amounts of virions, in contrast to the Cabb-D/H-infected cells where there are large amounts of virions and less electron-dense material. The viroplasms could be detected 3 days after inoculation with the Cabb-S isolate but only after 6 days in the leaves infected with the Cabb-D/H isolate. Another type of inclusion, intensely stained using Bernhard’s technique, was detected in the cells infected with either isolate about 10 days after inoculation. The significance of these cytoplasmic areas, which coexist with well-developed viroplasms, is discussed.

    • Ultrastructure of Pea Leaf Cells Infected with Three Strains of Red Clover Mottle Virus

      https://doi.org/10.1099/0022-1317-61-1-143
      SUMMARY

      Electron microscopy of pea ( L. cv. English Sabre) leaf cells, infected with three strains (N, S and O) of red clover mottle virus, revealed membranous inclusions characteristic of many comoviruses. The inclusions contained membranous vesicles with fine fibrils, osmiophilic globules and microbodies. The inclusions were not present in dark-green regions of systemically infected leaves (strains N and S). Membranous structures were also seen inside a few nuclei. In the chloroplasts of chlorotic regions of systemically infected leaves (strains N and S) phytoferritin was frequently observed. Chloroplasts in cells infected with strain O had no phytoferritin crystals, but were deformed by very large starch grains. Cell wall modifications were common in mesophyll regions infected with all three strains. Virus-like particles were found in all cell types, scattered or in crystals but not in the aggregated form in dark-green regions of systemically infected leaves (strains N and S).

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