Abstract
The three missense mutations on the gene for the 130-K protein of Tomato mosaic virus (ToMV) L11A have been thought to be responsible for the attenuation of its virulence. The Eco47I RFLP detecting the missense mutation at 2349 successfully discriminated L11A and its derivative attenuated isolates from ToMV virulent ones. RFLP analysis and mismatch amplification assay detecting the missense mutations at 1117 and 2754, respectively, could not discriminate some of the attenuated isolates from the virulent ones. These results indicated that, of the three missense mutations, only the one at 2349 was conserved in all the L11A-derivative attenuated isolates.
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