Abstract:
:Plant satellite RNAs generally reduce the level of helper virus accumulation and attenuate the disease symptoms induced by the helper virus that they depend upon for replication and packaging. As such, satellite RNAs could be used as biocontrol agents to reduce the level of disease in field crops, either by the application of a viral vaccine to healthy plants, or by the transgenic expression of satellite RNA in transformed plants. One such virus/satellite RNA system already under use in field tests is cucumber mosaic virus (CMV) and its satellite RNAs. However, in this system, some satellite RNAs also intensify viral disease in particular host plants. We passaged a satellite RNA of CMV with its helper virus to determine whether a satellite RNA that attenuates CMV-induced disease on tobacco plants could mutate to a pathogenic form, which might then be selected. In several experiments involving strains of CMV from each of the two subgroups, the satellite rapidly mutated to a pathogenic form, which was selected. This demonstrates an inherent risk associated with the use of attenuating satellite RNAs as a form of biocontrol of CMV.
journal_name
Nat Biotechnoljournal_title
Nature biotechnologyauthors
Palukaitis P,Roossinck MJdoi
10.1038/nbt1096-1264subject
Has Abstractpub_date
1996-10-01 00:00:00pages
1264-8issue
10eissn
1087-0156issn
1546-1696journal_volume
14pub_type
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