Abstract
The application of methyl jasmonate (MeJA) or ethephon, an ethylene-releasing agent, to Thompson Seedless grapes can reduce fruit detachment force (FDF) and promote the development of dry stem scars on berries, possibly improving the quality of machine-harvested grapes. However, the amount of MeJA or ethephon needed to stimulate abscission may be prohibitively expensive and result in excessive residues. Thus, experiments were conducted to determine whether MeJA might interact with 1-aminocyclopropane-1-carboxylic acid (ACC), a natural biochemical precursor of ethylene, to promote abscission-related processes and possibly reduce the amount of MeJA needed. In a preliminary trial, MeJA (672 and 1,344 mg/L) interacted with ACC (500 and 1,000 mg/L) to reduce FDF by 25 to 70% compared with untreated grapes. However, MeJA and ACC did not interact to affect preharvest fruit drop, although treatment with 672 or 1,344 mg/L MeJA caused 16 to 23% drop by 3 days after treatment (DAT). In a second trial, grapes treated with MeJA, singly, or with ACC, produced ethylene which peaked at 1 DAT, remained elevated at 2 DAT, and declined rapidly thereafter, whereas grapes treated only with ACC maintained moderately elevated ethylene production throughout the 10-day study. Treatment with ACC or MeJA reduced FDF within 1 or 2 DAT, respectively. By 2 DAT, berries began to abscise from MeJA-treated clusters, regardless of whether they were also treated with ACC, but on 3, 4, and 10 DAT, ACC and MeJA interacted to greatly promote preharvest fruit drop. Moreover, the combination of ACC and MeJA also promoted dry stem scar development. Thus, coapplication of MeJA and ACC is more effective at stimulating grape abscission-related processes than either compound applied singly.
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Claims 10
Claim · model-written summary
MeJA and ACC together reduced fruit detachment force by 25 to 70% versus untreated grapes.
Verbatim
e0“MeJA (672 and 1,344 mg/L) interacted with ACC (500 and 1,000 mg/L) to reduce FDF by 25 to 70% compared with untreated grapes.”
Claim · model-written summary
MeJA and ACC did not interact for preharvest fruit drop in the preliminary trial.
Not reportedTaxon
Verbatim
e0“MeJA and ACC did not interact to affect preharvest fruit drop”
Claim · model-written summary
MeJA alone caused 16 to 23% fruit drop by three days after treatment.
- Taxon
- Grapet0
- Treatment
- 672 or 1,344 mg/L MeJAe0
- Outcome
- drope0
- Direction
- causede0
- Value
- 16 to 23%e0
- Qualifier
- 3 days after treatment (DAT)e0
Not reportedComparator
Verbatim
e0“treatment with 672 or 1,344 mg/L MeJA caused 16 to 23% drop by 3 days after treatment (DAT)”
t0“Grape Berry”
Claim · model-written summary
Ethylene production after MeJA alone or with ACC peaked at one day, stayed elevated at two days, then declined.
Verbatim
e0“grapes treated with MeJA, singly, or with ACC, produced ethylene which peaked at 1 DAT, remained elevated at 2 DAT, and declined rapidly thereafter”
Claim · model-written summary
ACC alone maintained moderately elevated ethylene production for ten days.
- Taxon
- grapese0
- Treatment
- ACCe0
- Outcome
- ethylene productione0
- Direction
- maintained moderately elevatede0
- Qualifier
- 10-day studye0
Not reportedComparator
Verbatim
e0“grapes treated only with ACC maintained moderately elevated ethylene production throughout the 10-day study”
Claim · model-written summary
ACC reduced grape fruit detachment force within one day.
Not reportedComparator
Verbatim
e0“Treatment with ACC or MeJA reduced FDF within 1 or 2 DAT, respectively.”
t0“Grape Berry”
Claim · model-written summary
MeJA reduced grape fruit detachment force within two days.
Not reportedComparator
Verbatim
e0“Treatment with ACC or MeJA reduced FDF within 1 or 2 DAT, respectively.”
t0“Grape Berry”
Claim · model-written summary
MeJA treated berries began abscising by two days regardless of ACC.
- Treatment
- MeJA-treatede0
- Outcome
- berries began to abscisee0
- Qualifier
- regardless of whether they were also treated with ACCe0
Not reportedTaxon
Verbatim
e0“By 2 DAT, berries began to abscise from MeJA-treated clusters, regardless of whether they were also treated with ACC”
Claim · model-written summary
ACC and MeJA interacted to promote preharvest fruit drop at three, four and ten days.
Verbatim
e0“on 3, 4, and 10 DAT, ACC and MeJA interacted to greatly promote preharvest fruit drop”
t0“Grape Berry”
Claim · model-written summary
ACC and MeJA together promoted dry stem scar development.
- Taxon
- Grapet0
- Treatment
- combination of ACC and MeJAe0
- Outcome
- dry stem scar developmente0
- Direction
- promotede0
Not reportedComparator
Verbatim
e0“the combination of ACC and MeJA also promoted dry stem scar development”
t0“Grape Berry”
The same questions in other papers
1-aminocyclopropanecarboxylic acid · growth · VitisPositive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
(-)-methyl jasmonate · growth · VitisPositive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.