Abstract
SummaryThe plant hormone abscisic acid (ABA), the concentration of which increases in grape berry skins at the onset of maturation (veraison), appears to be involved in the regulation of anthocyanin accumulation. Preliminary tests suggested that exogenous applications of ABA could improve grape berry colour, but its high cost precluded the development of commercial applications. Recently, a lower-cost ABA production method was developed, which led to the evaluation of different concentrations of ABA, applied at or around veraison, on the quality of 'Redglobe' grapes. In two of three years of tests, several ABA treatments enhanced the anthocyanin content of grape skins. ABA, applied at approx. 300 mg l–1 at veraison, may be required to reliably increase pigmentation, and improve the colour of 'Redglobe' grapes. Although the total anthocyanin content was increased by ABA treatment, anthocyanin composition was not affected. Applications of ABA had few effects on fruit size or composition, although they did cause fruit softening, which is undesirable. A secondary objective of this study was to determine how the anthocyanin content of berry skins affected berry colour characteristics. Strong curvilinear relationships between anthocyanin content and lightness and hue showed that these colour characteristics were saturated by anthocyanin contents over 0.02 mg cm–2 of skin. These data suggest that colour measurements may be needed to evaluate the effect of cultural practices on colour in table grapes.
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Claims 7
Claim · model-written summary
ABA treatments enhanced anthocyanin content of Redglobe grape skins in two of three years.
- Taxon
- grapest0
- Material
- Redglobet0
- Treatment
- ABA treatmentse1
- Outcome
- anthocyanin content of grape skinse1
- Direction
- enhancede1
- Qualifier
- In two of three years of testse1
Not reportedComparator
Verbatim
t0“quality of ‘Redglobe’ grapes”
e1“In two of three years of tests, several ABA treatments enhanced the anthocyanin content of grape skins”
Claim · model-written summary
ABA applied at about 300 mg/l at veraison may be required to reliably increase grape pigmentation.
Verbatim
t0“quality of ‘Redglobe’ grapes”
e1“ABA, applied at approx. 300 mg l–1 at veraison, may be required to reliably increase pigmentation”
Claim · model-written summary
ABA treatment did not change anthocyanin composition of grape skins.
Not reportedComparator
Verbatim
t0“quality of ‘Redglobe’ grapes”
e1“Although the total anthocyanin content was increased by ABA treatment, anthocyanin composition was not affected”
Claim · model-written summary
Applications of ABA had few effects on grape fruit size or composition.
Not reportedComparatorDirection
Verbatim
t0“quality of ‘Redglobe’ grapes”
e1“Applications of ABA had few effects on fruit size or composition, although they did cause fruit softening, which is undesirable”
Claim · model-written summary
ABA applications caused grape fruit softening, which the authors regard as undesirable.
Not reportedComparatorDirection
Verbatim
t0“quality of ‘Redglobe’ grapes”
e1“Applications of ABA had few effects on fruit size or composition, although they did cause fruit softening, which is undesirable”
Claim · model-written summary
Lightness and hue of grape skins were saturated at anthocyanin contents above 0.02 mg cm–2 of skin.
Verbatim
t0“quality of ‘Redglobe’ grapes”
e1“Strong curvilinear relationships between anthocyanin content and lightness and hue showed that these colour characteristics were saturated by anthocyanin contents over 0.02 mg cm–2 of skin”
Claim · model-written summary
Colour measurements may be needed to evaluate the effect of cultural practices on colour in table grapes.
Verbatim
e1“These data suggest that colour measurements may be needed to evaluate the effect of cultural practices on colour in table grapes”
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