1887

Abstract

SUMMARY

A virus from (tribe: Aveneae) with filamentous particles about 685 nm long was serologically closely related to, and considered to be a strain of, ryegrass mosaic virus (RMV). This strain caused symptoms in (tribe: Aveneae) more readily and in (Italian ryegrass) less readily than did RMV from and spp. (tribe: Festuceae).

In and the isolate induced pinwheel inclusions with associated laminar aggregates and tubes, but isolates induced pinwheels with laminar aggregates only. The intracellular distribution of the pinwheels differed with the severity of host response. Thus, in plants with mild symptoms most pinwheels were contiguous with the plasmalemma close to plasmodesmata, but in plants with severe symptoms the pinwheels were free in the cytoplasm.

Virus particles occurred either randomly or in bundles in the cytoplasm of mesophyll and phloem companion cells. In infected with the isolate, fibrous inclusions, possibly virus particles, occurred in some nuclei. When symptoms were severe, mitochondria and chloroplasts were amorphous and the latter had many marginal vesicles.

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1977-08-01
2021-10-17
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