Infection of a cowpea line by cowpea severe mosaic virus (CPSMV) was inhibited by cowpea mosaic virus (CPMV) even though the plants were immune to CPMV. The inhibition was dose-dependent and was complete if CPMV was added to the inoculum in a 50-fold excess over CPSMV. Isolated CPMV RNA inhibited infection by CPSMV or by isolated CPSMV RNA. CPMV particles devoid of RNA (top component), u.v.-inactivated but intact CPMV particles or u.v.-inactivated CPMV RNA did not inhibit infection by CPSMV. Bottom component particles of CPMV, but not middle component particles, inhibited CPSMV to the same extent as unfractionated CPMV. These findings strongly suggest that the interference is not due to competition between the particles or the RNAs of the two viruses for infectible sites. It may be that CPMV infects cells of the ‘immune’ host subliminally and that the inhibition is associated with replication of at least bottom component RNA of CPMV.

Keyword(s): CPMV , CPSMV and interference

Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error