Summary
This paper is the second in the series dealing with the ultrastructure ofTetragonia expansa Murr. infected with the beet yellows virus. It considers the relation of the virus to the conducting cells in the phloem and the xylem. Virus particles occurred in mature sieve elements, their amount increasing as the infected leaf became older. In older leaves some sieve elements were completely blocked with virus. Virus particles were seen in pores of sieve plates, in plasmodesmata interconnecting sieve elements and parenchyma cells, and in those between parenchyma cells. Mature and immature tracheary elements also contained virus particles. Presence of inclusions composed of vesicles and virus in some immature tracheary elements may indicate that virus multiplies in these cells. No vesicles and no virus particles were discovered in immature sieve elements.
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This work was supported in part by National Science Foundation grant GB-5506.
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Esau, K., Hoefert, L.L. Cytology of beet yellows virus infection inTetragonia . Protoplasma 72, 459–476 (1971). https://doi.org/10.1007/BF01289514
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DOI: https://doi.org/10.1007/BF01289514