Abstract
A disorder of sweetpotato, characterised by abnormal brown colouration inside the storage root, began to occur around 2006. The aims of the present study are to test our previous hypothesis that IB disorder occurs due excessive starch synthesis inside the storage root at the maturation stage and to present a technique for inhibiting IB disorder based on experimental findings. The severity of internal browning (IB) disorder in sweetpotato was greater when larger root biomass was achieved by vigorous top growth through increased basal fertiliser application. In contrast, suppression of root growth by defoliation at the early stage of root maturation and/or through shading during the maturation stage was correlated with marked suppression of IB disorder. Expression profiling of genes involved in starch synthesis and starch grain distribution around secondary vascular tissue were examined for shading treatment samples. Transcription levels of genes related to starch synthesis were decreased in the shade treatment. Further, the starch grain content as an area percent in the cells was reduced through shade treatment. These observations suggest that the occurrence of IB disorder is largely affected by the degree of activation of starch synthesis utilising sugar transported to the root.Abbreviations: IB: internal browning; DAP: days after planting; T/R: top/root; rbt: ratio of browned to total tissue
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Claims 6
Claim · model-written summary
Internal browning severity in sweetpotato was greater when increased basal fertiliser gave larger root biomass through vigorous top growth.
- Taxon
- sweetpotato
_Flower.jpg?width=60)
Ipomoea batatase1 - Treatment
- increased basal fertiliser applicatione1
- Outcome
- severity of internal browning (IB) disordere1
- Direction
- greatere1
- Qualifier
- when larger root biomass was achieved by vigorous top growthe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e1“The severity of internal browning (IB) disorder in sweetpotato was greater when larger root biomass was achieved by vigorous top growth through increased basal fertiliser application”
Claim · model-written summary
Defoliation at the early stage of root maturation was correlated with marked suppression of internal browning disorder in sweetpotato.
- Taxon
- sweetpotatoIpomoea batatase1
- Treatment
- defoliation at the early stage of root maturatione2
- Outcome
- IB disordere2
- Direction
- marked suppressione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The severity of internal browning (IB) disorder in sweetpotato was greater when larger root biomass was achieved by vigorous top growth through increased basal fertiliser application”
e2“suppression of root growth by defoliation at the early stage of root maturation and/or through shading during the maturation stage was correlated with marked suppression of IB disorder”
Claim · model-written summary
Shading during the maturation stage was correlated with marked suppression of internal browning disorder in sweetpotato.
- Taxon
- sweetpotatoIpomoea batatase1
- Treatment
- shading during the maturation stagee2
- Outcome
- IB disordere2
- Direction
- marked suppressione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The severity of internal browning (IB) disorder in sweetpotato was greater when larger root biomass was achieved by vigorous top growth through increased basal fertiliser application”
e2“suppression of root growth by defoliation at the early stage of root maturation and/or through shading during the maturation stage was correlated with marked suppression of IB disorder”
Claim · model-written summary
Shade treatment decreased transcription levels of genes related to starch synthesis in sweetpotato roots.
- Taxon
- sweetpotatoIpomoea batatase1
- Treatment
- shade treatmente3
- Gene
- genes related to starch synthesise3
- Outcome
- Transcription levelse3
- Direction
- decreasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The severity of internal browning (IB) disorder in sweetpotato was greater when larger root biomass was achieved by vigorous top growth through increased basal fertiliser application”
e3“Transcription levels of genes related to starch synthesis were decreased in the shade treatment”
Claim · model-written summary
Shade treatment reduced the starch grain content as an area percent in the cells of sweetpotato roots.
- Taxon
- sweetpotatoIpomoea batatase1
- Treatment
- shade treatmente4
- Outcome
- starch grain content as an area percent in the cellse4
- Direction
- reducede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The severity of internal browning (IB) disorder in sweetpotato was greater when larger root biomass was achieved by vigorous top growth through increased basal fertiliser application”
e4“Further, the starch grain content as an area percent in the cells was reduced through shade treatment”
Claim · model-written summary
Occurrence of internal browning is suggested to depend on the degree of activation of starch synthesis using sugar transported to the root.
- Taxon
- sweetpotatoIpomoea batatase1
- Compound
- sugare5
- Outcome
- occurrence of IB disordere5
- Qualifier
- degree of activation of starch synthesise5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The severity of internal browning (IB) disorder in sweetpotato was greater when larger root biomass was achieved by vigorous top growth through increased basal fertiliser application”
e5“These observations suggest that the occurrence of IB disorder is largely affected by the degree of activation of starch synthesis utilising sugar transported to the root”
The same questions in other papers
shade · physiology: photosynthesis · Ipomoea batatas (sweet potato)Positive and negative results
1 in the opposite direction
- negative
fertilization · disease · Ipomoea batatas (sweet potato)Positive and negative results
3 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
6 papers more in this group
See all 10 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.