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• W2097075731 abstract "A strain of cassava latent geminivirus (CLV) was isolated from mosaic-affected cassava plants from coastal districts of Kenya. This virus (CLV-C) did not infect Nicotiana clevelandii, a diagnostic host of the type strain (CLV-T); experimental host range was very restricted and CLV-C only infected N. benthamiana and N. rustica out of several solanaceous hosts readily infected by CLV-T. CLV-C was also isolated from naturally infected Jatropha multifida (Euphorbiaceae) and Hewittia sublobata (Convolvulaceae). CLV-C was propagated in N. benthamiana with difficulty and only those isolates derived from cassava plants infected with severe mosaic symptoms were maintained more or less successfully; these sources usually contained a higher concentration of CLV than plants with mild symptoms. Symptom variants generally remained unchanged when grafted into a highly susceptible South American cassava variety. CLV-C and CLV-T seemed to occur respectively only in coastal and western districts but their ranges overlapped in central Kenya where they could have been introduced in infected material. CLV-C could be purified satisfactorily with the method used for CLV-T but only after modifying the procedure by substituting phosphate for borate in the extraction buffer, n-butanol for n-butanol/chloroform in clarification of extracts, and phosphate for borate buffer when resuspending concentrated virus. A virus serologically indistinguishable from CLV-T was isolated from mosaic- affected material obtained from Nigeria; East African and Nigerian isolates were essentially similar in host range and symptomatology. In gel-diffusion serology tests, pronounced precipitation spurs developed between CLV-T and CLV-C indicating that the isolates were related but not identical serologically. Symptoms typical of cassava mosaic disease appeared in only three of 105 plants in experiments on transmission of CLV-C and CLV-T by whiteflies, when attempted acquisition of either clarified CLV-infective sap or purified CLV was made through ‘Parafilm’ membranes. Because it is possible that the three infections resulted from contamination, they cannot constitute proof of transmission. The presence of CLV in relation to the etiology of cassava mosaic thus remains unresolved." @default.
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• W2097075731 date "1981-10-01" @default.
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• W2097075731 title "A strain of cassava latent virus occurring in coastal districts of Kenya" @default.
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• W2097075731 doi "https://doi.org/10.1111/j.1744-7348.1981.tb05142.x" @default.
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