NOTA

 

Microscopia electrônica de tecidos foliares de mandioca infetados pelo vírus do mosaico comum da mandioca^*

 

Electron microscopy of cassava leaf tissues infected with common mosaic virus

 

 

E. W. Kitajima; A. S. Costa

 

 

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SUMMARY

Ultrathin sections of leaf tissues of cassava plants, infected with cassava common mosaic virus (CCMV) were examined in the electron microscope. Fibrous masses, variable in shape and dimensions were found in the cytoplasm of practically all cell types, except tracheids and sieve tubes, of leaves infected with CCMV. These inclusions were not seen in control preparations made from healthy plant leaves, nor in those infected with the cassava vein mosaic virus, that is spherical. The inclusions associated with CCMV are composed of particles, the length of which could not be determined, with 10-15 mμ in diameter, disposed in a loose parallel array, and were found mostly in the chlorotic area of infected leaves. No association of fibrous masses with cell structures was observed.
The particles component of these fibrous masses are considered as CCMV in situ,due to their similarities with those found in vitro(15 mμ X 500 mμ) and to the constant association with the diseased material.

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Recebido para publicação em 29 de novembro de 1965.

 

 

* Trabalho realizado com auxilio financeiro da FAPESP (C. Agron. 64/454) e do CNPq (TC. 4026).