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Differentiation of pseudorecombinants of two cucumber mosaic virus strains by biological properties and aphid transmission



Differentiation of pseudorecombinants of two cucumber mosaic virus strains by biological properties and aphid transmission



Phytopathology 81(2): 139-143



Pseudorecombinants prepared from the RNAs of two distinct strains of cucumber mosiac virus (CMV) were studied to determine reasons for differences in symptom severity and transmission efficiency by Aphis gossypii. Strain CMV-FNY, readily transmitted to and from summer squash [Cucurbita pepo], and CMV-SNY, a moderately transmitted strain, were used. Genomic RNAs 1, 2, and 3 of CMV-FNY and CMV-SNY were used to construct pseudorecombinants in all combinations. Symptom severity ratings were higher when RNA 1 from CMV-FNY was present than when recombinants were constructed with RNA 1 from CMV-SNY. The average number of days required to reach 100% symptom expression was lower when RNA1 from CMV-FNY was present. Maximum aphid transmission and symptom severity occurred for the combination of RNAs 1 and 3 from CMV-FNY (e.g., F-S-F), followed by the combinations of F-F-S, S-S-F, and S-F-S. Results suggest that RNA 1, assocaited with virus replication, is most important in achieving maximum transmission and symptom severity. RNA 3 appears to have an intermediate role in aphid transmission and symptom expression.

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