Abstract
Effective abscission agents that decrease fruit detachment force (FDF) are sought by the California raisin industry to improve the continuous tray mechanical harvesting method. Such agents might also enable mechanical harvest of table and wine grapes ( Vitis vinifera L.), but few agents are known to be effective for grape. Thus, methyl jasmonate (MeJA) and six other compounds known to stimulate abscission of other fruits were screened for their ability to reduce FDF of mature ‘Thompson Seedless’ grapes. Most compounds tested reduced FDF to some extent, but MeJA was particularly effective. Solutions containing between 45 and 4500 ppm MeJA reduced FDF by at least 50% to 85% compared with nontreated fruits. Application of 2250 and 4500 ppm MeJA to ‘Thompson Seedless’ vines caused 25% to 50% fruit drop, respectively, within 10 d after treatment (DAT). The efficacy of MeJA was verified in a second experiment in which solutions of 0, 1125, 2250, or 4500 ppm MeJA were applied to clusters of ‘Crimson Seedless’ grapes; at 14 DAT, FDF declined as a linear function of MeJA applied. The grapes did not abscise, but berries treated with 2250 to 4500 ppm MeJA had slightly lower soluble solids than nontreated fruits. Solutions of 0 or 4500 ppm MeJA applied to clusters of ‘Cabernet Sauvignon’ and ‘Merlot’ grapevines reduced FDF by 66% and 75%, respectively. Fruit drop was estimated to be less than 10%. Thus, a solution containing up to 4500 ppm MeJA may be an effective abscission agent to facilitate mechanical harvest of ‘Cabernet Sauvignon’ or ‘Merlot’.
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Claims 11
Claim · model-written summary
Most tested compounds reduced grape fruit detachment force to some extent.
Not reportedComparator
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“Most compounds tested reduced FDF to some extent”
Claim · model-written summary
MeJA solutions of 45 to 4500 ppm reduced Thompson Seedless FDF by at least 50% to 85% versus untreated fruit.
- Taxon
- grapese0
- Treatment
- between 45 and 4500 ppm MeJAe1
- Outcome
- FDFe1
- Direction
- reducede1
- Value
- 50% to 85%e1
- Comparator
- nontreated fruitse1
Not reportedMaterial
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“Solutions containing between 45 and 4500 ppm MeJA reduced FDF by at least 50% to 85% compared with nontreated fruits.”
Claim · model-written summary
2250 ppm MeJA caused 25% fruit drop in Thompson Seedless within 10 days.
- Taxon
- grapese0
- Material
- ‘Thompson Seedless’e1
- Treatment
- 2250e1
- Outcome
- fruit drope1
- Direction
- causede1
- Value
- 25%e1
- Qualifier
- within 10 d after treatment (DAT)e1
Not reportedComparator
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“Application of 2250 and 4500 ppm MeJA to ‘Thompson Seedless’ vines caused 25% to 50% fruit drop, respectively, within 10 d after treatment (DAT).”
Claim · model-written summary
4500 ppm MeJA caused 50% fruit drop in Thompson Seedless within 10 days.
- Taxon
- grapese0
- Material
- ‘Thompson Seedless’e1
- Treatment
- 4500 ppm MeJAe1
- Outcome
- fruit drope1
- Direction
- causede1
- Value
- 50%e1
Not reportedComparator
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“Application of 2250 and 4500 ppm MeJA to ‘Thompson Seedless’ vines caused 25% to 50% fruit drop, respectively, within 10 d after treatment (DAT).”
Claim · model-written summary
Crimson Seedless FDF declined linearly with applied MeJA at 14 days.
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“solutions of 0, 1125, 2250, or 4500 ppm MeJA were applied to clusters of ‘Crimson Seedless’ grapes; at 14 DAT, FDF declined as a linear function of MeJA applied.”
Claim · model-written summary
Crimson Seedless grapes did not abscise after MeJA treatment.
Not reportedDirection
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“The grapes did not abscise”
Claim · model-written summary
MeJA at 2250 to 4500 ppm slightly lowered Crimson Seedless soluble solids relative to untreated fruit.
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“berries treated with 2250 to 4500 ppm MeJA had slightly lower soluble solids than nontreated fruits.”
Claim · model-written summary
MeJA reduced Cabernet Sauvignon FDF by 66%.
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“Solutions of 0 or 4500 ppm MeJA applied to clusters of ‘Cabernet Sauvignon’ and ‘Merlot’ grapevines reduced FDF by 66% and 75%, respectively.”
Claim · model-written summary
MeJA reduced Merlot FDF by 75%.
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“Solutions of 0 or 4500 ppm MeJA applied to clusters of ‘Cabernet Sauvignon’ and ‘Merlot’ grapevines reduced FDF by 66% and 75%, respectively.”
Claim · model-written summary
Fruit drop in Cabernet Sauvignon and Merlot was estimated below 10%.
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“‘Cabernet Sauvignon’ and ‘Merlot’ grapevines reduced FDF by 66% and 75%, respectively. Fruit drop was estimated to be less than 10%.”
Claim · model-written summary
Up to 4500 ppm MeJA may facilitate mechanical harvesting of Cabernet Sauvignon or Merlot.
Verbatim
e0“table and wine grapes ( Vitis vinifera L.)”
e1“a solution containing up to 4500 ppm MeJA may be an effective abscission agent to facilitate mechanical harvest of ‘Cabernet Sauvignon’ or ‘Merlot’.”
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See all 7 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.