Abstract
SUMMARY Cells of five grass and cereal species infected with cocksfoot mottle virus, phleum mottle virus or cocksfoot mild mosaic virus were examined in ultra-thin sections. The intracellular distribution of the virus particles and their effects on cell ultrastructure appeared dependent more on the severity of the host/virus interaction than on the particular virus or host species involved. Particles of all three viruses occurred in the cytoplasm of mesophyll and phloem companion cells. Those of cocksfoot mottle virus were observed occasionally also in the nucleus. Relatively few particles, randomly distributed in the cytoplasm, were present in cells of plants with mild symptoms. In plants with severe symptoms the particles were numerous and often in near- or true-crystalline aggregates. In partially disrupted cells, virus particles occurred occasionally in membrane-bound, sometimes vesiculated, packets in the cell vacuole. These seemed to originate from the tonoplast. In more severely disrupted cells the tonoplast was lost and virus particles were scattered randomly throughout the vacuole. Ultrastructural effects ranged from an increase in endoplasmic reticulum and vacuolation of the cytoplasm in the cells of plants with mild symptoms, to the total disintegration of all cell organelles in plants with the severest symptoms. Extrusions, which often encircled a volume of cytoplasm developed from the chloroplasts and mitochrondia; membrane-bound vesicles, containing virus particles, appeared in the stroma of chloroplasts and in the mitochondria.
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Claims 10
Claim · model-written summary
Particle distribution and ultrastructural effects tracked host-virus severity more than virus or host species.
- Taxon
- Grasses and Cerealst0
- Outcome
- intracellular distribution of the virus particles and their effects on cell ultrastructuree0
- Qualifier
- severity of the host/virus interactione0
Not reportedDirection
Verbatim
t0“Grasses and Cereals”
e0“The intracellular distribution of the virus particles and their effects on cell ultrastructure appeared dependent more on the severity of the host/virus interaction than on the particular virus or host species involved.”
Claim · model-written summary
Particles of all three viruses occurred in mesophyll and phloem companion cell cytoplasm.
Verbatim
t0“Grasses and Cereals”
e0“Particles of all three viruses occurred in the cytoplasm of mesophyll and phloem companion cells.”
Claim · model-written summary
Cocksfoot mottle virus particles occasionally occurred in nuclei.
- Taxon
- Grasses and Cerealst0
- Interactor
- cocksfoot mottle virusCocksfoot mottle viruse0pathogen
- Outcome
- observed occasionally also in the nucleuse0
Verbatim
t0“Grasses and Cereals”
e0“Those of cocksfoot mottle virus were observed occasionally also in the nucleus.”
Claim · model-written summary
Mildly symptomatic plants had relatively few randomly distributed cytoplasmic particles.
Verbatim
t0“Grasses and Cereals”
e0“Relatively few particles, randomly distributed in the cytoplasm, were present in cells of plants with mild symptoms.”
Claim · model-written summary
Severely symptomatic plants had numerous particles, often in crystalline aggregates.
Verbatim
t0“Grasses and Cereals”
e0“In plants with severe symptoms the particles were numerous and often in near- or true-crystalline aggregates.”
Claim · model-written summary
In partially disrupted cells, particles sometimes occurred in membrane-bound vacuolar packets.
Verbatim
t0“Grasses and Cereals”
e0“In partially disrupted cells, virus particles occurred occasionally in membrane-bound, sometimes vesiculated, packets in the cell vacuole.”
Claim · model-written summary
In more severely disrupted cells the tonoplast was absent and particles scattered through the vacuole.
Verbatim
t0“Grasses and Cereals”
e0“In more severely disrupted cells the tonoplast was lost and virus particles were scattered randomly throughout the vacuole.”
Claim · model-written summary
Cell damage ranged from greater endoplasmic reticulum and vacuolation under mild symptoms to complete organelle disintegration under severe symptoms.
Verbatim
t0“Grasses and Cereals”
e0“Ultrastructural effects ranged from an increase in endoplasmic reticulum and vacuolation of the cytoplasm in the cells of plants with mild symptoms, to the total disintegration of all cell organelles in plants with the severest symptoms.”
Claim · model-written summary
Extrusions developed from chloroplasts and mitochondria.
Verbatim
t0“Grasses and Cereals”
e0“Extrusions, which often encircled a volume of cytoplasm developed from the chloroplasts and mitochrondia”
Claim · model-written summary
Membrane-bound vesicles containing viral particles appeared in chloroplast stroma and mitochondria.
Verbatim
t0“Grasses and Cereals”
e0“membrane-bound vesicles, containing virus particles, appeared in the stroma of chloroplasts and in the mitochondria.”