Viruses Infecting Cassava in Kenya

Plant Disease
H K WereE Maiss

Abstract

A survey of cassava viruses was conducted in major cassava-growing regions of Kenya. A total of 185 leaf samples and 62 stem cuttings from plants with viral disease symptoms were collected and analyzed by biological, electron microscopy, enzyme-linked immunosorbent assay, and polymerase chain reaction. All samples from western Kenya had cassava begomoviruses (African cassava mosaic virus [ACMV], East African cassava mosaic virus [EACMV], and Uganda variant [EACMV-UG]) in either single or in mixed infection. However, all samples from the Coast region were infected with only EACMV, a begomovirus. In addition, 15 samples had mixed infections of EACMV and three other hitherto unidentified filamentous viruses. The viruses observed were 200, 500, 650, and 750 nm long, respectively. In addition to rod-shaped and some flexuous viruses, as seen in a crude sap preparation, pinwheels also were observed, indicating a possible association of some of the viruses with the Potyviridae family. The symptoms induced by these viruses in Nicotiana benthamiana were very severe and often caused about 50% death of the test plants. Back inoculation onto cassava resulted in 100% infections. This finding provides evidence that, other than begomoviruses t...Continue Reading

Citations

Sep 10, 2017·Molecular Plant Pathology·Katie R TomlinsonGary D Foster
Sep 12, 2006·The Journal of General Virology·Simon E BullJohn Stanley

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