Abstract
Improved tobacco cultivars introgressed with alleles of the recessive resistance va gene have been widely deployed in France to limit agronomical consequences associated with Potato virus Y (PVY) infections. Unfortunately, necrotic symptoms associated with PVY have been reported on these cultivars suggesting that PVY is able to overcome the resistance. A field survey was performed in France in 2007 to (i) estimate the prevalence of PVY in tobacco plants showing symptoms and (ii) characterize PVY isolates present in susceptible and va ‐derived tobacco cultivars. A serological typing procedure, applied to 556 leaves collected from different French tobacco growing areas, was performed using polyclonal antisera raised against different viral species including PVY. Viral species were detected in 80·8% of leaves and PVY was present in 83·5% of infected samples. However, statistical analysis confirmed that the probability of a tobacco plant being infected with PVY is reduced in va hosts. Eighty‐six PVY isolates were mechanically inoculated on one susceptible and three va ‐derived tobacco cultivars used as indicator hosts to define virulence of these isolates against alleles 0, 1 and 2 of the va gene. Both qualitative and quantitative analyses showed that 55 PVY isolates were able to overcome the three va alleles. Moreover, the monitored biological diversity of PVY isolates was higher in the susceptible tobacco hosts than in the va ‐derived ones. This study helps to understand consequences of the deployment of the va gene in tobacco on diversity and virulence of PVY isolates.
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Claims 5
Claim · model-written summary
Viral species were found in 80·8% of symptomatic tobacco leaves.
- Taxon
- tobacco
Nicotiana tabacumt0 - Outcome
- Viral species were detectede0
- Value
- 80·8%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Viral species were detected in 80·8% of leaves”
t0“tobacco plants”
Claim · model-written summary
PVY occurred in 83·5% of infected tobacco samples.
- Taxon
- tobaccoNicotiana tabacumt0
- Interactor
- PVY
Potato virus Ye0pathogen - Outcome
- PVY was presente0
- Value
- 83·5%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PVY was present in 83·5% of infected samples”
t0“tobacco plants”
Claim · model-written summary
The probability of PVY infection was lower in va tobacco hosts.
- Taxon
- tobaccoNicotiana tabacume0
- Material
- va hostse0
- Interactor
- PVYPotato virus Ye0pathogen
- Outcome
- probability of a tobacco plant being infected with PVYe0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the probability of a tobacco plant being infected with PVY is reduced in va hosts”
e1“alleles of the recessive resistance va gene”
Claim · model-written summary
Fifty-five PVY isolates overcame all three va alleles.
- Taxon
- tobaccoNicotiana tabacumt0
- Interactor
- PVYPotato virus Ye0pathogen
- Gene
- vae0
- Outcome
- PVY isolates were able to overcome the three va allelese0
- Value
- 55e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“55 PVY isolates were able to overcome the three va alleles”
t0“tobacco plants”
Claim · model-written summary
PVY isolate diversity was higher in susceptible tobacco than in va-derived hosts.
- Taxon
- tobaccoNicotiana tabacume0
- Material
- susceptible tobacco hostse0
- Interactor
- PVYPotato virus Ye0pathogen
- Outcome
- biological diversity of PVY isolatese0
- Direction
- highere0
- Comparator
- va ‐derived onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the monitored biological diversity of PVY isolates was higher in the susceptible tobacco hosts than in the va ‐derived ones”