1887

Abstract

SUMMARY

Inoculation at 0 °C improved the efficiency of infecting tomato protoplasts with RNA of tobacco mosaic virus (TMV). Up to 41% infection was obtained when inoculation was at 0 °C with 10 µg/ml RNA in the presence of 1 µg/ml poly--lysine in 0.01 -potassium citrate buffered 0.7 -mannitol (pH 5.2). The homozygous gene for resistance was expressed in tomato protoplasts inoculated with RNA of TMV-L, a common tomato strain of TMV; no virus progeny were detected by fluorescent antibody staining or infectivity assay. Virus multiplied rapidly in protoplasts from susceptible homozygotes. Protoplasts homozygous for were infected by the RNA of TMV-CH2, a tomato strain which can overcome this resistance in plants. These results resemble those previously reported for inocula using intact virus, and suggest that blocks virus growth after the uncoating stage.

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1979-09-01
2022-01-21
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