Abstract
Under natural field conditions, the abundance of plant viruses sharing the same host frequently results in mixed infections. Viruses co‐occurring inside host tissues often interact with one another synergistically or antagonistically. This paper addresses within‐host interactions among genetically different isolates of Potato virus Y (PVY), a serious pathogen that attacks solanaceous crops, particularly potato and tobacco. Manifold aspects of the relationships between six PVY isolates representing PVY O , PVY N‐Wi /PVY N:O and PVY NTN strains have been characterized. Plants of tobacco cv. Samsun and of two potato cultivars were inoculated both simultaneously and sequentially with different inoculation sequences and different time intervals between inoculations. Symptoms exhibited by doubly inoculated plants varied, primarily depending on the isolates involved as well as on the order of inoculation. Significant reductions of the titres of PVY N:O and PVY N‐Wi isolates in plants inoculated sequentially or simultaneously with PVY NTN isolates were recorded. These reductions were most probably due to inhibition of replication and accumulation of one isolate by another. In some combinations, a pre‐existing infection with PVY NTN prevented infection with the secondary virus. By contrast, challenge inoculation by PVY N:O , PVY N‐Wi or PVY O had no marked effects on the titre of the pre‐inoculated PVY NTN isolate. Microscopic visualization revealed a tendency of strains towards separation from each other in host tissues. These results provide strong experimental evidence for the existence of antagonistic interactions among PVY isolates. Moreover, these results demonstrate the occurrence of complete or at least partial cross‐protection among PVY isolates, with NTN isolates being evidently more fit than their counterparts.
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Claims 11
Claim · model-written summary
Double inoculation produced symptoms varying by isolate and inoculation order.
- Taxon
- tobacco cv. Samsun and of two potato cultivars
Nicotiana tabacume1 - Interactor
- isolatese0
- Outcome
- Symptoms exhibited by doubly inoculated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Symptoms exhibited by doubly inoculated plants varied, primarily depending on the isolates involved as well as on the order of inoculation”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
Claim · model-written summary
PVY NTN significantly reduced PVY N:O titres during simultaneous or sequential inoculation.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume1
- Treatment
- PVY NTN isolatese0
- Interactor
- PVY N:Oe0pathogen
- Second interactor
- PVY NTNe0pathogen
- Outcome
- titres of PVY N:Oe0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant reductions of the titres of PVY N:O and PVY N‐Wi isolates in plants inoculated sequentially or simultaneously with PVY NTN isolates were recorded”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
Claim · model-written summary
PVY NTN significantly reduced PVY N‐Wi titres during simultaneous or sequential inoculation.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume1
- Treatment
- PVY NTN isolatese0
- Interactor
- PVY N‐Wie0pathogen
- Second interactor
- PVY NTNe0pathogen
- Outcome
- PVY N‐Wi isolatese0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant reductions of the titres of PVY N:O and PVY N‐Wi isolates in plants inoculated sequentially or simultaneously with PVY NTN isolates were recorded”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
Claim · model-written summary
PVY NTN likely inhibited replication and accumulation of another isolate.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume2
- Interactor
- PVY NTNe1pathogen
- Outcome
- inhibition of replication and accumulation of one isolate by anothere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These reductions were most probably due to inhibition of replication and accumulation of one isolate by another”
e1“PVY NTN isolates”
e2“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
Claim · model-written summary
Pre-existing PVY NTN sometimes prevented secondary virus infection.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume1
- Treatment
- pre‐existing infection with PVY NTNe0
- Interactor
- secondary viruse0pathogen
- Second interactor
- PVY NTNe0pathogen
- Outcome
- infection with the secondary viruse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In some combinations, a pre‐existing infection with PVY NTN prevented infection with the secondary virus”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
Claim · model-written summary
PVY N:O challenge had no marked effect on pre-inoculated PVY NTN titre.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume1
- Treatment
- challenge inoculation by PVY N:Oe0
- Interactor
- PVY NTNe0pathogen
- Second interactor
- PVY N:Oe0pathogen
- Outcome
- titre of the pre‐inoculated PVY NTN isolatee0
- Direction
- no marked effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“challenge inoculation by PVY N:O , PVY N‐Wi or PVY O had no marked effects on the titre of the pre‐inoculated PVY NTN isolate”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
Claim · model-written summary
PVY N‐Wi challenge had no marked effect on pre-inoculated PVY NTN titre.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume1
- Treatment
- challenge inoculation by PVY N:O , PVY N‐Wie0
- Interactor
- PVY NTNe0pathogen
- Second interactor
- PVY N‐Wie0pathogen
- Outcome
- titre of the pre‐inoculated PVY NTN isolatee0
- Direction
- no marked effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“challenge inoculation by PVY N:O , PVY N‐Wi or PVY O had no marked effects on the titre of the pre‐inoculated PVY NTN isolate”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
Claim · model-written summary
PVY O challenge had no marked effect on pre-inoculated PVY NTN titre.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume1
- Treatment
- PVY Oe0
- Interactor
- PVY NTNe0pathogen
- Second interactor
- PVY Oe0pathogen
- Outcome
- titre of the pre‐inoculated PVY NTN isolatee0
- Direction
- no marked effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“challenge inoculation by PVY N:O , PVY N‐Wi or PVY O had no marked effects on the titre of the pre‐inoculated PVY NTN isolate”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
Claim · model-written summary
PVY strains tended to separate within host tissues.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume1
- Interactor
- Potato virus Y
Potato virus Ye2pathogen - Outcome
- tendency of strains towards separation from each other in host tissuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Microscopic visualization revealed a tendency of strains towards separation from each other in host tissues”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
e2“Potato virus Y (PVY)”
Claim · model-written summary
PVY isolates showed complete or partial cross-protection.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume1
- Interactor
- PVYPotato virus Ye0pathogen
- Outcome
- complete or at least partial cross‐protection among PVY isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“complete or at least partial cross‐protection among PVY isolates”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
Claim · model-written summary
PVY NTN isolates were more fit than other isolates.
- Taxon
- tobacco cv. Samsun and of two potato cultivarsNicotiana tabacume1
- Interactor
- NTN isolatese0pathogen
- Outcome
- more fite0
- Direction
- moree0
- Comparator
- their counterpartse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NTN isolates being evidently more fit than their counterparts”
e1“Plants of tobacco cv. Samsun and of two potato cultivars were inoculated”
The same questions in other papers
Solanum tuberosum · organism · Nicotiana tabacum (tobacco)Positive and negative results
1 in the opposite direction
- negative
inoculation · organism · Nicotiana tabacum (tobacco)Positive and negative results
7 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.