Abstract
The effect of light duration on potato black dot was examined in plants grown under controlled conditions and in plantlets in tissue culture. A short‐day (SD) photoperiod of 8 h light enhanced disease levels caused by Colletotrichum coccodes compared with a long‐day (LD) photoperiod of 16 h light. Four cultivars (Agria, Cara, Désirée and Nicola) exhibited higher disease levels under SD conditions. Fungal colonization rates, level of sclerotia on roots, and crown rot symptoms were significantly higher under SD conditions in all cultivars. Parameters related to plant development (height and shoot weight) were reduced in plants grown under SD conditions in all cultivars tested, regardless of inoculation with the fungus. Similar results were also obtained with tissue‐culture plantlets of cvs Cara, Désirée, Nicola and Alpha grown in an aseptic system under SD and LD conditions. Fungal colonization indices, level of sclerotia on roots, and crown rot symptoms on inoculated plantlets were significantly more severe in all cultivars tested when grown under SD conditions. Plant height and shoot weight of cvs Cara, Désirée and Nicola were significantly affected by both day length and inoculation with C. coccodes , with inoculated plantlets being shorter and smaller under SD conditions. These findings support the hypothesis that light duration plays an important role in C. coccodes infection, and may be one of the major factors responsible for the severe expression of black dot and yield losses observed in the Israeli autumn season, as may also occur in other potato‐production areas in the Mediterranean region.
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Claims 6
Claim · model-written summary
Short-day (8 h light) photoperiod enhanced black dot disease levels in potato compared with long-day (16 h light).
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- photoperiod of 8 h lighte1
- Interactor
- Colletotrichum coccodes
Colletotrichum coccodese1pathogen - Outcome
- disease levels caused by Colletotrichum coccodese1
- Direction
- enhancede1
- Comparator
- photoperiod of 16 h lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black dot caused by Colletotrichum coccodes on potato”
e1“A short‐day (SD) photoperiod of 8 h light enhanced disease levels caused by Colletotrichum coccodes compared with a long‐day (LD) photoperiod of 16 h light”
Claim · model-written summary
SD conditions increased black dot disease levels in four potato cultivars.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Agria, Cara, Désirée and Nicolae2
- Treatment
- SD conditionse2
- Outcome
- disease levelse2
- Direction
- highere2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black dot caused by Colletotrichum coccodes on potato”
e2“Four cultivars (Agria, Cara, Désirée and Nicola) exhibited higher disease levels under SD conditions”
Claim · model-written summary
SD conditions significantly increased fungal colonization, sclerotia on roots and crown rot symptoms in all potato cultivars.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- SD conditionse3
- Outcome
- Fungal colonization rates, level of sclerotia on roots, and crown rot symptomse3
- Direction
- significantly highere3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black dot caused by Colletotrichum coccodes on potato”
e3“Fungal colonization rates, level of sclerotia on roots, and crown rot symptoms were significantly higher under SD conditions in all cultivars”
Claim · model-written summary
SD conditions reduced plant height and shoot weight of potato regardless of fungal inoculation.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- SD conditionse4
- Outcome
- height and shoot weighte4
- Direction
- were reducede4
- Qualifier
- regardless of inoculation with the funguse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black dot caused by Colletotrichum coccodes on potato”
e4“Parameters related to plant development (height and shoot weight) were reduced in plants grown under SD conditions in all cultivars tested, regardless of inoculation with the fungus”
Claim · model-written summary
In tissue-culture plantlets grown under SD conditions, fungal colonization, sclerotia and crown rot were significantly more severe in all cultivars.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- SD conditionse5
- Outcome
- Fungal colonization indices, level of sclerotia on roots, and crown rot symptomse5
- Direction
- significantly more severee5
- Setting
- aseptic systeme2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black dot caused by Colletotrichum coccodes on potato”
e5“Fungal colonization indices, level of sclerotia on roots, and crown rot symptoms on inoculated plantlets were significantly more severe in all cultivars tested when grown under SD conditions”
e2“grown in an aseptic system under SD and LD conditions”
Claim · model-written summary
Inoculation with C. coccodes made potato plant height and shoot weight smaller under SD conditions.
- Taxon
- potatoSolanum tuberosumt0
- Material
- cvs Cara, Désirée and Nicolae6
- Treatment
- inoculation with C. coccodese6
- Interactor
- C. coccodesColletotrichum coccodese6pathogen
- Outcome
- Plant height and shoot weighte6
- Direction
- shorter and smallere6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“black dot caused by Colletotrichum coccodes on potato”
e6“Plant height and shoot weight of cvs Cara, Désirée and Nicola were significantly affected by both day length and inoculation with C. coccodes, with inoculated plantlets being shorter and smaller under SD conditions”
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See all 104 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.