Abstract
Aim: Fifteen nepoviruses are able to induce fanleaf degeneration in grapes, which is the viral disease with the highest economic impact. Grapevine FanLeaf Virus (GFLV) is the main causal agent of this disease worldwide and in Europe, followed by Arabis Mosaic Virus (ArMV). A third nepovirus has been described in France: Tomato Black Ring Virus (TBRV), detected in vines for the first time in France on a multi-varietal plot in 2009. The aim of this work is to evaluate the effect of TBRV on grape yield and berry quality potential in two grapevine varieties.[br/] Methods and results: Quantitative and qualitative impact of TBRV was investigated in 2010 and 2011 in the vine plot where the virus was first detected in France. Over 200 vines were analyzed by ELISA tests in order to determine their status regarding viral diseases. Vines were distributed in four groups: TBRV positive versus virus free for Merlot and Cabernet franc respectively. For each vine, the presence of eleven other viruses was investigated. In 2010 and 2011 shoot length was measured. Grape composition was also analyzed to determine technological maturity and phenol content in grapes of each vine in relation to its virus status. Total pruning weight was reduced in TBRV infected vines, while lateral shoot number and length were increased. All yield components were affected by the presence of the virus. Vines positive to TBRV produced less bunches and berries and smaller berries compared to healthy vines. Yield loss was greater on Merlot compared to Cabernet franc. Grape quality parameters seemed to be not negatively affected by the presence of TBRV.[br/] Conclusions: The major impact of TBRV was a significant yield decrease. The enhanced development of lateral shoots may be considered as a second negative impact that could increase production cost.[br/] Significance and impact of the study: These results provide essential information on the impact of TBRV in vineyards. Consequences for management of the viral disease in the vineyard are discussed.
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Claims 9
Claim · model-written summary
TBRV-infected vines had reduced total pruning weight.
- Taxon
- Merlot and Cabernet franct0
- Interactor
- TBRVTomato black ring viruse0pathogen
- Outcome
- Total pruning weighte0
- Direction
- reducede0
Verbatim
e0“Total pruning weight was reduced in TBRV infected vines”
t0“Merlot and Cabernet franc”
Claim · model-written summary
TBRV-infected vines had increased lateral shoot number and length.
- Taxon
- Merlot and Cabernet franct0
- Interactor
- TBRVTomato black ring viruse1pathogen
- Outcome
- lateral shoot number and lengthe0
- Direction
- increasede0
Verbatim
e0“lateral shoot number and length were increased”
e1“Total pruning weight was reduced in TBRV infected vines”
t0“Merlot and Cabernet franc”
Claim · model-written summary
TBRV-positive vines produced fewer bunches than healthy vines.
Verbatim
e0“Vines positive to TBRV produced less bunches and berries and smaller berries compared to healthy vines”
t0“Merlot and Cabernet franc”
Claim · model-written summary
TBRV-positive vines produced fewer berries than healthy vines.
Verbatim
e0“Vines positive to TBRV produced less bunches and berries and smaller berries compared to healthy vines”
t0“Merlot and Cabernet franc”
Claim · model-written summary
TBRV-positive vines produced smaller berries than healthy vines.
Verbatim
e0“Vines positive to TBRV produced less bunches and berries and smaller berries compared to healthy vines”
t0“Merlot and Cabernet franc”
Claim · model-written summary
TBRV-associated yield loss was greater in Merlot than Cabernet franc.
Verbatim
e0“Yield loss was greater on Merlot compared to Cabernet franc”
t0“Tomato Black Ring Virus (TBRV) on Merlot and Cabernet franc”
Claim · model-written summary
Grape quality parameters did not seem negatively affected by TBRV.
- Taxon
- Merlot and Cabernet franct0
- Interactor
- TBRVTomato black ring viruse0pathogen
- Outcome
- Grape quality parameterse0
- Direction
- not negatively affectede0
Verbatim
e0“Grape quality parameters seemed to be not negatively affected by the presence of TBRV”
t0“Merlot and Cabernet franc”
Claim · model-written summary
TBRV caused a significant yield decrease.
- Taxon
- Merlot and Cabernet franct0
- Interactor
- TBRVTomato black ring viruse0pathogen
- Outcome
- yielde0
- Direction
- decreasee0
Verbatim
e0“The major impact of TBRV was a significant yield decrease”
t0“Merlot and Cabernet franc”
Claim · model-written summary
Enhanced lateral shoot development may increase production costs.
- Taxon
- Merlot and Cabernet franct0
- Interactor
- TBRVTomato black ring virust0pathogen
- Outcome
- production coste0
- Qualifier
- enhanced development of lateral shootse0
Verbatim
e0“The enhanced development of lateral shoots may be considered as a second negative impact that could increase production cost”
t0“Tomato Black Ring Virus (TBRV) on Merlot and Cabernet franc”