Studies on strains of TMV in tobacco production areas in Guangdong Province
Abstract: Six Tobacco - TMV isolates which cause different symptom expressions on tobacco in different tobcco production areas in Guangdog Province were selected from 138 samples and were studied. The symptom expression of the 6 Tobacco - TMV isoates on 6 differenial host plants and 6 tobacco varieties were about the same, although some minor differences might exist. The morphology of the virus particles of the 6 isoates, their thermal inactivation points, electrophoretic mobility and ultraviolet light absorption were found to be about the same. By agar donble - diffusion reaction and indirect ELISA, the 6 isolates were found to have very close serological relationship. The amino acid compositions of the coat proteins of the 6 isolates were found to be very siwhar each other and similar to the Vulgare strain, althonh minor dihaences ekisted in the amount of certain amino residues. According to the experimental results, it was conluded that the 6 isoates all belong to the common strain of TMV.