Abstract
Mature ‘Golden Delicious’ apple trees in British Columbia (B.C.) and Québec, Canada and Cox’s Orange Pippin apple in Canterbury, New Zealand were sprayed weekly for four weeks, commencing at petal fall, with formulations of GA4, GA4+7 mixture (1:1) or GA4+iso—GA7 (a less active isomer). This study was predicated on previous work suggesting that GA4 is more effective than GA7 for fruit russet control and is less likely than GA7 to inhibit return flowering. It was hypothesized that conversion of GA7 in the GA4+7 mixture to iso—GA7 might ameliorate the expected negative effect of the GA treatment on return flowering. Surface russet was prevalent on Québec ‘Golden Delicious’ and all GA treatments reduced its severity. Stem-end russet was reduced by GA4+iso—GA7 in the B.C. ‘Golden Delicious’ trial but none of the treatments influenced stem-end russet of New Zealand ‘Cox’s Orange Pippin’. All G As and GA mixtures reduced fruit set and seed number per fruit and increased average fruit weight in one or more experiments. There were clear indications that iso—GA7 does have biological activity, at least when applied with GA4. Most importantly, return flowering of ‘Cox’s Orange Pippin’ was less adversely affected by GA4+iso—GA7 than by the original GA4+7 mixture. GA4 (7.5 mg T1) promoted return flowering of ‘Golden Delicious’ in British Columbia whereas 15 mg/l/GA4+7, GA4+iso—GA7 and GA4 were ineffective.
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Claims 11
Claim · model-written summary
All GA treatments reduced surface russet on Québec Golden Delicious.
- Taxon
- apple
Malus domesticat0 - Material
- Golden Deliciouse0
- Treatment
- all GA treatmentse0
- Outcome
- Surface russete0
- Direction
- reducede0
- Setting
- Québece0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Surface russet was prevalent on Québec ‘Golden Delicious’ and all GA treatments reduced its severity”
t0“apple”
Claim · model-written summary
GA4+iso—GA7 reduced stem-end russet on British Columbia Golden Delicious.
- Taxon
- appleMalus domesticat0
- Material
- Golden Deliciouse0
- Treatment
- GA4+iso—GA7e0
- Outcome
- Stem-end russete0
- Direction
- reducede0
- Setting
- B.C.e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem-end russet was reduced by GA4+iso—GA7 in the B.C. ‘Golden Delicious’ trial”
t0“apple”
Claim · model-written summary
GA treatments did not influence stem-end russet in New Zealand Cox’s Orange Pippin.
- Taxon
- appleMalus domesticat0
- Material
- Cox’s Orange Pippine0
- Treatment
- treatmentse0
- Outcome
- stem-end russete0
- Direction
- nonee0
- Setting
- New Zealande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“none of the treatments influenced stem-end russet of New Zealand ‘Cox’s Orange Pippin’”
t0“apple”
Claim · model-written summary
GA treatments reduced apple fruit set in at least one experiment.
- Taxon
- appleMalus domesticat0
- Treatment
- G As and GA mixturese0
- Outcome
- fruit set and seed number per fruite0
- Direction
- reducede0
- Qualifier
- one or more experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All G As and GA mixtures reduced fruit set and seed number per fruit and increased average fruit weight in one or more experiments”
t0“apple”
Claim · model-written summary
GA treatments increased average apple fruit weight in at least one experiment.
- Taxon
- appleMalus domesticat0
- Treatment
- G As and GA mixturese0
- Outcome
- average fruit weighte0
- Direction
- increasede0
- Qualifier
- one or more experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All G As and GA mixtures reduced fruit set and seed number per fruit and increased average fruit weight in one or more experiments”
t0“apple”
Claim · model-written summary
Iso—GA7 showed biological activity when applied with GA4.
- Taxon
- appleMalus domesticat0
- Treatment
- iso—GA7e0
- Outcome
- biological activitye0
- Qualifier
- at least when applied with GA4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were clear indications that iso—GA7 does have biological activity, at least when applied with GA4”
t0“apple”
Claim · model-written summary
GA4+iso—GA7 affected return flowering less adversely than GA4+7 in Cox’s Orange Pippin.
- Taxon
- appleMalus domesticat0
- Material
- Cox’s Orange Pippine0
- Treatment
- GA4+iso—GA7e0
- Outcome
- return floweringe0
- Direction
- less adversely affectede0
- Comparator
- original GA4+7 mixturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“return flowering of ‘Cox’s Orange Pippin’ was less adversely affected by GA4+iso—GA7 than by the original GA4+7 mixture”
t0“apple”
Claim · model-written summary
GA4 promoted return flowering of Golden Delicious in British Columbia.
- Taxon
- appleMalus domesticat0
- Material
- Golden Deliciouse0
- Treatment
- GA4 (7.5 mg T1)e0
- Outcome
- return floweringe0
- Direction
- promotede0
- Setting
- British Columbiae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA4 (7.5 mg T1) promoted return flowering of ‘Golden Delicious’ in British Columbia”
t0“apple”
Claim · model-written summary
At 15 mg/l, GA4+7 was ineffective for Golden Delicious return flowering.
- Taxon
- appleMalus domesticat0
- Treatment
- 15 mg/l/GA4+7e0
- Outcome
- return floweringe1
- Direction
- ineffectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15 mg/l/GA4+7, GA4+iso—GA7 and GA4 were ineffective”
t0“apple fruit quality”
e1“return flowering of ‘Golden Delicious’ in British Columbia”
Claim · model-written summary
At 15 mg/l, GA4+iso—GA7 was ineffective for Golden Delicious return flowering.
- Taxon
- appleMalus domesticat0
- Treatment
- GA4+iso—GA7e0
- Outcome
- return floweringe1
- Direction
- ineffectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15 mg/l/GA4+7, GA4+iso—GA7 and GA4 were ineffective”
t0“apple fruit quality”
e1“return flowering of ‘Golden Delicious’ in British Columbia”
Claim · model-written summary
At 15 mg/l, GA4 was ineffective for Golden Delicious return flowering.
- Taxon
- appleMalus domesticat0
- Treatment
- GA4e0
- Outcome
- return floweringe1
- Direction
- ineffectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15 mg/l/GA4+7, GA4+iso—GA7 and GA4 were ineffective”
t0“apple fruit quality”
e1“return flowering of ‘Golden Delicious’ in British Columbia”
The same questions in other papers
Gibberellic acid · yield · Malus domestica (apple)Positive and negative results
15 papers in the same direction as this paper · 11 in the opposite direction
- positive
- positive
- no effect
23 papers more in this group
See all 27 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.