Abstract
The forchlorfenuron (CPPU) application is recommended in table-grape after fruit-set to boost berry sizing, albeit CPPU application during pre-flowering is gaining attention due to its effect in influencing berry Ca content. This study evaluated the effects of pre-flowering applications of the synthetic cytokinin CPPU and vapor pressure deficit (VPD) manipulation on potassium (K) and calcium (Ca) content in table grape berries (Vitis vinifera L.). The experiment was conducted in southern Italy (Bernalda, Basilicata) in a plastic covered vineyard of the cv ‘Sugrathirteen’N. (Midnight Beauty ®). Forchlorfenuron treatments included single (S_CPPU; 100 inflorescences) and double (D_CPPU; 75 inflorescences) applications, while low VPD was obtained by enclosing, after fruit-set, 50 bunches in transparent PVC bags (VPDLOW). Potassium accumulation in berries was unaffected by VPD and resulted to be synchronized with sugar accumulation, reflecting its predominant phloem-based transport. In contrast, Ca accumulation was significantly influenced by VPD reduction, indeed VPDLOW bunches showed a reduction in both Ca content and berry fresh mass. CPPU treatments per se increased K concentration in the rachis but did not significantly affect Ca accumulation in berries. These findings suggest that VPD conditions around bunches rather then pre-flowering CPPU applications could be pivotal in determining berry fresh mass, Ca content and sugar accumulation.
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Claims 6
Claim · model-written summary
VPD did not affect berry potassium accumulation.
Not reportedComparator
Verbatim
e0“Potassium accumulation in berries was unaffected by VPD”
t0“table grape berry”
Claim · model-written summary
Berry potassium accumulation was synchronized with sugar accumulation.
Not reportedDirection
Verbatim
e0“Potassium accumulation in berries was unaffected by VPD and resulted to be synchronized with sugar accumulation”
t0“table grape berry”
Claim · model-written summary
Lower VPD significantly reduced berry calcium content.
Not reportedComparator
Verbatim
e0“Ca accumulation was significantly influenced by VPD reduction, indeed VPDLOW bunches showed a reduction in both Ca content and berry fresh mass.”
t0“table grape berry”
Claim · model-written summary
Lower VPD reduced berry fresh mass.
Not reportedComparator
Verbatim
e0“VPDLOW bunches showed a reduction in both Ca content and berry fresh mass.”
t0“table grape berry”
Claim · model-written summary
CPPU increased rachis potassium concentration.
- Taxon
- table grapet0
- Organ / stage
- rachise0
- Treatment
- CPPU treatmentse0
- Outcome
- K concentratione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“CPPU treatments per se increased K concentration in the rachis”
t0“table grape berry”
Claim · model-written summary
CPPU did not significantly affect berry calcium accumulation.
- Taxon
- table grapet0
- Treatment
- CPPU treatmentse0
- Outcome
- Ca accumulation in berriese0
- Direction
- did not significantly affecte0
Not reportedComparator
Verbatim
e0“CPPU treatments per se increased K concentration in the rachis but did not significantly affect Ca accumulation in berries.”
t0“table grape berry”
The same questions in other papers
forchlorfenuron · nutrient: content · VitisPositive and negative results
1 in the opposite direction
- no effect
humidity · nutrient: content · VitisResults agree
2 papers in the same direction as this paper
- no effect
- no effect
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.