Molecular Breeding (2001) 8, 85-94

Mireille Jacquemond, Pierre-Yves Teycheney, Isabelle Carrère and Jesus Navas-Castillo (2001)
Resistance phenotypes of transgenic tobacco plants expressing different Cucumber mosaic virus (CMV) coat protein genes
Molecular Breeding 8 (1), 85-94
Abstract: Tobacco plants expressing a transgene encoding the coat protein (CP) of a subgroup I strain of cucumber mosaic cucumovirus (CMV), I17F, were not resistant to strains of either subgroup I or II. In contrast, the expression of the CP of a subgroup II strain, R, conferred substantial resistance, but only towards strains of the same subgroup. When protection was observed, the levels of resistance were similar when plants were inoculated with either virions or viral RNA, but resistance was more effective when plants were inoculated with viruliferous aphids. Resistance was not dependent on inoculum strength and was expressed as a recovery phenotype not yet described for plants expressing a CMV CP gene. Recovery could be observed either early in infection (less than one week after inoculation) or later (4 to 5 weeks after inoculation). In plants showing early recovery, mild symptoms were observed on the inoculated leaves, and in some cases symptoms developed on certain lower systemically infected leaves, but the upper leaves were symptomless and virus-free. Late recovery corresponded to the absence of both symptoms and virus in the upper leaves of plants that were previously fully infected. Northern blot analyses of resistant plants suggested that a gene silencing mechanism was not involved in the resistance observed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Mireille Jacquemond, Pierre-Yves Teycheney, Jesús Navas-Castillo

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cucumber mosaic virus	Tobacco (Nicotiana tabacum)