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We present evidence that rice tungro spherical virus (RTSV) has a genome of polyadenylated single-stranded RNA of about 10 kb whereas rice tungro bacilliform virus (RTBV) contains double-stranded circular DNA. RTBV DNA has been mapped and shown to have two discontinuities, one in each strand, at specific sites; it thus resembles that of the caulimo-viruses. Gel electrophoresis of RTSV preparations revealed two protein bands (M r 35K and 26K). RTBV yielded two major protein bands of 37K and 33K together with several minor species of higher and lower M r which react with antiviral serum.
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