Abstract
Pseudorecombinants prepared from the RNAs of two distinct strains of cucumber mosaic 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, 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 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 RNA 1 from CMV-FNY was present (...)
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