Abstract
A uniform dark red skin colour is desirable in table potatoes; however, the colour of the popular red-skinned cultivar Norland is variable and tends to fade during storage. This study evaluated the potential to enhance skin colour of red potatoes by foliar application of the auxin-type herbicide 2,4-D or long-lasting analogs of the naturally occuring hormone abscisic acid (ABA). In field trials conducted from 2007 to 2009, the plant growth regulators (PGR) were applied to the foliage of Norland and AC Peregrine Red (a new dark red variety) potato plants when the crop was at the tuber set stage. Although the 2,4-D treatments altered the appearance of the foliage they had no consistent impact on yields or tuber shape, but did reduce the average tuber size. Objective and subjective assessments indicated that the 2,4-D treatments altered the skin colour of the tubers both immediately after harvest and after extended cold storage. The degree and nature of the colour change was somewhat dependent on the year, the rate of 2,4-D applied and the cultivar. The change in tuber appearance arising from the 2,4-D treatments was not always considered desirable by consumer panellists. The 2,4-D treatments also reduced tuber damage by common scab (Streptomyces scabies), but tended to increase grade out to powdery scab (Spongospora subterranea). The ABA analogs had no consistent impact on yields, skin colour or disease reaction. Key words: 2,4-dichlorophenoxyacetic acid, abscisic acid, common scab, powdery scab, Streptomyces scabies, Spongospora subterranea
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Claims 9
Claim · model-written summary
2,4-D altered potato foliage appearance.
- Taxon
- potatoes
Solanum tuberosumt0 - Treatment
- 2,4-D treatmentse0
- Outcome
- appearance of the foliagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 2,4-D treatments altered the appearance of the foliage”
t0“potatoes”
Claim · model-written summary
2,4-D had no consistent impact on yield or tuber shape.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- 2,4-D treatmentse0
- Outcome
- yields or tuber shapee0
- Direction
- no consistent impacte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 2,4-D treatments altered the appearance of the foliage they had no consistent impact on yields or tuber shape”
t0“potatoes”
Claim · model-written summary
2,4-D reduced average tuber size.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- 2,4-D treatmentse1
- Outcome
- average tuber sizee0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but did reduce the average tuber size”
e1“Although the 2,4-D treatments”
t0“potatoes”
Claim · model-written summary
2,4-D altered tuber skin colour after harvest and cold storage, with effects varying by year, dose and cultivar.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- 2,4-D treatmentse0
- Outcome
- skin colour of the tuberse0
- Qualifier
- the year, the rate of 2,4-D applied and the cultivare1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 2,4-D treatments altered the skin colour of the tubers both immediately after harvest and after extended cold storage”
e1“The degree and nature of the colour change was somewhat dependent on the year, the rate of 2,4-D applied and the cultivar”
t0“potatoes”
Claim · model-written summary
Consumers did not always regard the 2,4-D induced tuber appearance change as desirable.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- 2,4-D treatmentse0
- Outcome
- tuber appearancee0
- Qualifier
- not always considered desirable by consumer panellistse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The change in tuber appearance arising from the 2,4-D treatments was not always considered desirable by consumer panellists”
t0“potatoes”
Claim · model-written summary
2,4-D reduced tuber damage from common scab.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- 2,4-D treatmentse0
- Interactor
- Streptomyces scabiesStreptomyces scabieie0pathogen
- Outcome
- tuber damage by common scabe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 2,4-D treatments also reduced tuber damage by common scab (Streptomyces scabies)”
t0“potatoes”
Claim · model-written summary
2,4-D tended to increase tubers graded out for powdery scab.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- 2,4-D treatmentse1
- Interactor
- Spongospora subterranea
Spongospora subterraneae0pathogen - Outcome
- grade out to powdery scabe0
- Direction
- increasee0
- Qualifier
- tended toe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but tended to increase grade out to powdery scab (Spongospora subterranea)”
e1“The 2,4-D treatments”
t0“potatoes”
Claim · model-written summary
ABA analogs had no consistent impact on yield or skin colour.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- ABA analogse0
- Outcome
- yields, skin coloure0
- Direction
- no consistent impacte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ABA analogs had no consistent impact on yields, skin colour or disease reaction”
t0“potatoes”
Claim · model-written summary
ABA analogs had no consistent impact on disease reaction.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- ABA analogse0
- Outcome
- disease reactione0
- Direction
- no consistent impacte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ABA analogs had no consistent impact on yields, skin colour or disease reaction”
t0“potatoes”
The same questions in other papers
2,4-D · yield · Solanum tuberosum (potato)Results differ
4 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
2 papers more in this group
See all 6 papers →2,4-D · Streptomyces scabiei · Solanum tuberosum (potato)Positive and negative results
1 in the opposite direction
- no effect
(+)-abscisic acid · quality: postharvest · Solanum tuberosum (potato)Positive and negative results
1 in the opposite direction
- positive
(+)-abscisic acid · disease · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
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.