Abstract
To investigate the amount of yield losses caused by Iranian isolates of tomato yellow leaf curl virus (TYLCV-[Ab]) and tomato leaf curl Karnataka virus (ToLCKV-IR) in Rio Grande (RG) and Grosse Lisse (GL) tomato cultivars, tomato seedlingswere separately agroinoculated with an infectious clone of either virus and disease development was monitored over four time intervals. After the emergence of symptoms, disease severity (DS) was evaluated visually using an ordinal rating scale and the data was converted to a ratio scale. Losses caused by the viruses were estimated by measuring vegetative indices including wet and dry weight and height of the aerial and underground parts of the plants. Initial DS in plants infected by ToLCKV-IR was less than those infected by TYLCV-[Ab]. Descending order of rates of disease increase for the studied pathosystems was as follows: ToLCKV-IR-infected GL>TYLCV-Ab-infected GL> TYLCV-[Ab]-infected GL> ToLCKV-IR-infected RG. With delayed inoculation, DS was reduced in both cultivars inoculated with either of the two viruses. A segmented linear model showed a very good fit to the data of relative biomass and duration of exposure of all pathosystems. The estimated parameters of the model were used to evaluate different aspects of the damage curve. The highest crop loss disease threshold was observed for GL cultivar irrespective of the inoculated virus. Similar results were achieved when the desensitization disease level was evaluated. Curvilinear tolerance or slope did not show any significant difference between the infected-GL plants to either virus and also TOLCKV-IR-RG, while TYLCV-[Ab]-RG showed the highest curvilinear tolerance. Findings of this study can be applied in screening for tolerant tomato plants.
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Claims 8
Claim · model-written summary
ToLCKV-IR caused lower initial disease severity than TYLCV-[Ab].
- Taxon
- tomato
Solanum lycopersicumt0 - Interactor
- ToLCKV-IRe0pathogen
- Outcome
- Initial DSe0
- Direction
- lesse0
- Comparator
- TYLCV-[Ab]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Initial DS in plants infected by ToLCKV-IR was less than those infected by TYLCV-[Ab].”
t0“tomato cultivars”
Claim · model-written summary
Disease increase rates differed among cultivar–virus combinations in the stated order.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- GLe0
- Interactor
- ToLCKV-IRe0pathogen
- Outcome
- rates of disease increasee0
- Direction
- Descending ordere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Descending order of rates of disease increase for the studied pathosystems was as follows: ToLCKV-IR-infected GL>TYLCV-Ab-infected GL> TYLCV-[Ab]-infected GL> ToLCKV-IR-infected RG.”
t0“tomato cultivars”
Claim · model-written summary
Delayed inoculation reduced disease severity in both cultivars with either virus.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- delayed inoculatione0
- Outcome
- DSe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With delayed inoculation, DS was reduced in both cultivars inoculated with either of the two viruses.”
t0“tomato cultivars”
Claim · model-written summary
The segmented linear model fit relative biomass and exposure duration data very well.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- very good fite0
- Qualifier
- relative biomass and duration of exposuree0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A segmented linear model showed a very good fit to the data of relative biomass and duration of exposure of all pathosystems.”
t0“tomato cultivars”
Claim · model-written summary
GL had the highest crop loss disease threshold regardless of inoculated virus.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- GLe0
- Outcome
- crop loss disease thresholde0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest crop loss disease threshold was observed for GL cultivar irrespective of the inoculated virus.”
t0“tomato cultivars”
Claim · model-written summary
GL also had the highest desensitization disease level.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- GLt1
- Outcome
- desensitization disease levele0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar results were achieved when the desensitization disease level was evaluated.”
t0“tomato cultivars”
t1“GL cultivar”
Claim · model-written summary
Curvilinear tolerance did not differ significantly between GL with either virus and RG with ToLCKV-IR.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- GLe0
- Outcome
- Curvilinear tolerancee0
- Direction
- did not show any significant differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Curvilinear tolerance or slope did not show any significant difference between the infected-GL plants to either virus and also TOLCKV-IR-RG, while TYLCV-[Ab]-RG showed the highest curvilinear tolerance.”
t0“tomato cultivars”
Claim · model-written summary
RG infected by TYLCV-[Ab] had the highest curvilinear tolerance.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- RGe0
- Interactor
- TYLCV-[Ab]e0pathogen
- Outcome
- curvilinear tolerancee0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TYLCV-[Ab]-RG showed the highest curvilinear tolerance.”
t0“tomato cultivars”
The same questions in other papers
inoculation · disease · Solanum lycopersicum (tomato)Positive and negative results
135 papers in the same direction as this paper · 128 in the opposite direction · 2 reporting no difference from an alternative
- negative
- no effect
- negative
262 papers more in this group
See all 266 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.