Abstract
SummaryThe mechanism of action of paclobutrazol in promoting flower initiation in two cultivars of pear was studied by comparing responses to overall sprays, localized treatment of shoot tips and shoot tipping by hand, and by monitoring bud development in ‘Doyenne du Comice’. Flower initiation was promoted as effectively by localized shoot tip applications as by overall sprays. Shoot tipping did not promote flower initiation, and did not affect the stimulation of flower bud production by overall sprays. Shoot extension in both varieties was inhibited equally by shoot-tip applications, but not by overall sprays, the effects of which on ‘Comice’ were followed by a compensatory promotion of growth. In the season after overall spraying, ‘Comice’ produced many more new, mostly “bourse” shoots. This effect was not produced by shoot tipping or by paclobutrazol treatment of shoot tips or fruitlets. Repeated sprays of paclobutrazol at 250 mg l−1, but not a single spray at 1 g l−1 in July, delayed flower initiation by about 13 days, and extended the period of active node accumulation in the buds. Both repeated and single sprays shortened the plastochrone in axillary and terminal buds which remained vegetative. The results were consistent with paclobutrazol having increased flower initiation by decreasing apical dominance.
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Claims 13
Claim · model-written summary
Localized shoot tip paclobutrazol promoted flower initiation as effectively as overall sprays.
- Taxon
- pear
_Poirier_Fleurs_et_feuilles.jpg?width=60)
Pyrus communist0 - Treatment
- localized shoot tip applicationse0
- Outcome
- Flower initiatione0
- Direction
- promotede0
- Comparator
- overall sprayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Poirier_Fleurs_et_feuilles.jpg?width=500)
Verbatim
e0“Flower initiation was promoted as effectively by localized shoot tip applications as by overall sprays.”
t0“pear”
Claim · model-written summary
Shoot tipping did not promote flower initiation.
- Taxon
- pearPyrus communist0
- Treatment
- Shoot tippinge0
- Outcome
- flower initiatione0
- Direction
- did not promotee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot tipping did not promote flower initiation”
t0“pear”
Claim · model-written summary
Shoot tipping did not alter overall spray stimulation of flower bud production.
- Taxon
- pearPyrus communist0
- Treatment
- Shoot tippinge1
- Outcome
- stimulation of flower bud production by overall sprayse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not affect the stimulation of flower bud production by overall sprays.”
t0“pear”
e1“Shoot tipping did not promote flower initiation”
Claim · model-written summary
Shoot tip applications equally inhibited shoot extension in both pear varieties.
- Taxon
- pearPyrus communist0
- Treatment
- shoot-tip applicationse0
- Outcome
- Shoot extensione0
- Direction
- inhibitede0
- Comparator
- overall sprayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot extension in both varieties was inhibited equally by shoot-tip applications, but not by overall sprays”
t0“pear”
Claim · model-written summary
Overall sprays did not inhibit shoot extension.
- Taxon
- pearPyrus communist0
- Treatment
- overall sprayse0
- Outcome
- Shoot extensione0
- Direction
- note0
- Comparator
- shoot-tip applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot extension in both varieties was inhibited equally by shoot-tip applications, but not by overall sprays”
t0“pear”
Claim · model-written summary
Overall sprays were followed by compensatory growth promotion in Comice.
- Taxon
- pearPyrus communist0
- Material
- Comicee0
- Treatment
- overall sprayse1
- Outcome
- growthe0
- Direction
- promotione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of which on ‘Comice’ were followed by a compensatory promotion of growth.”
t0“pear”
e1“but not by overall sprays”
Claim · model-written summary
Comice produced many more new, mostly bourse shoots after overall spraying.
- Taxon
- pearPyrus communist0
- Material
- Comicee0
- Treatment
- overall sprayinge0
- Outcome
- new, mostly “bourse” shootse0
- Direction
- many moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the season after overall spraying, ‘Comice’ produced many more new, mostly “bourse” shoots.”
t0“pear”
Claim · model-written summary
Shoot tipping did not reproduce the increase in new Comice shoots.
- Taxon
- pearPyrus communist0
- Treatment
- shoot tippinge0
- Outcome
- This effect was not producede0
- Direction
- not producede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This effect was not produced by shoot tipping or by paclobutrazol treatment of shoot tips or fruitlets.”
t0“pear”
Claim · model-written summary
Paclobutrazol treatment of shoot tips or fruitlets did not reproduce the new shoot response.
- Taxon
- pearPyrus communist0
- Treatment
- paclobutrazol treatment of shoot tips or fruitletse0
- Outcome
- This effect was not producede0
- Direction
- not producede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This effect was not produced by shoot tipping or by paclobutrazol treatment of shoot tips or fruitlets.”
t0“pear”
Claim · model-written summary
Repeated 250 mg l−1 sprays delayed flower initiation by about 13 days.
- Taxon
- pearPyrus communist0
- Treatment
- Repeated sprays of paclobutrazol at 250 mg l−1e0
- Outcome
- flower initiatione0
- Direction
- delayede0
- Value
- about 13 dayse0
- Comparator
- a single spray at 1 g l−1 in Julye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Repeated sprays of paclobutrazol at 250 mg l−1, but not a single spray at 1 g l−1 in July, delayed flower initiation by about 13 days”
t0“pear”
Claim · model-written summary
Repeated sprays extended active node accumulation in buds.
- Taxon
- pearPyrus communist0
- Treatment
- Repeated sprays of paclobutrazol at 250 mg l−1e1
- Outcome
- period of active node accumulation in the budse0
- Direction
- extendede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and extended the period of active node accumulation in the buds.”
t0“pear”
e1“Repeated sprays of paclobutrazol at 250 mg l−1”
Claim · model-written summary
Both repeated and single sprays shortened the plastochrone in vegetative buds.
- Taxon
- pearPyrus communist0
- Treatment
- repeated and single sprayse0
- Outcome
- plastochrone in axillary and terminal buds which remained vegetativee0
- Direction
- shortenede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both repeated and single sprays shortened the plastochrone in axillary and terminal buds which remained vegetative.”
t0“pear”
Claim · model-written summary
The authors inferred that reduced apical dominance explained increased flower initiation under paclobutrazol.
- Taxon
- pearPyrus communist0
- Treatment
- paclobutrazole0
- Outcome
- flower initiatione0
- Qualifier
- decreasing apical dominancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results were consistent with paclobutrazol having increased flower initiation by decreasing apical dominance.”
t0“pear”
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