Abstract
Prohexadione-Calcium (P-Ca) is a promising new shoot growth retardant that is already registered on apples in North America (Apogee®) and in Europe (Regalis®). This gibberellin biosynthesis inhibitor with limited persistence and low toxicity was tested on five Pyrus communis cultivars: ‘Rosemarie’, ‘Flamingo’, ‘Early Bon Chretien’, ‘Packham’s Triumph’ and ‘Forelle’. P-Ca was able to reduce shoot growth in all of the cultivars, but there was a marked difference in sensitivity towards different rates of P-Ca between the different cultivars. Fruit set was improved in ‘Rosemarie’, ‘Forelle’ and ‘Early Bon Chretien’, which led to a decrease in final fruit size of ‘Rosemarie’. P-Ca caused a decrease in return bloom in ‘Packham’s Triumph’ and ‘Forelle’. Girdling only reduced shoot growth in ‘Forelle’ but did not improve fruit set in any of the cultivars. Girdling improved final fruit weight of ‘Flamingo’, increased fruit length in ‘Early Bon Chretien’ and increased return bloom in all of the cultivars except ‘Packham’s Triumph’. The five cultivars are categorised according to their sensitivity towards P-Ca: ‘Rosemarie’ > ‘Flamingo’ = ‘Early Bon Chretien’ = ‘Packham’s Triumph’ > ‘Forelle’.
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Claims 14
Claim · model-written summary
P-Ca reduced shoot growth in all five pear cultivars.
- Taxon
- PEAR
_Poirier_Fleurs_et_feuilles.jpg?width=60)
Pyrus communist0 - Treatment
- P-Cae0
- Outcome
- shoot growthe0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Poirier_Fleurs_et_feuilles.jpg?width=500)
Verbatim
e0“P-Ca was able to reduce shoot growth in all of the cultivars”
t0“PEAR”
Claim · model-written summary
Pear cultivars differed in sensitivity to P-Ca rate.
- Taxon
- PEARPyrus communist0
- Treatment
- different rates of P-Cae0
- Outcome
- sensitivitye0
- Direction
- differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a marked difference in sensitivity towards different rates of P-Ca between the different cultivars”
t0“PEAR”
Claim · model-written summary
P-Ca improved fruit set in Rosemarie.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit set was improved in ‘Rosemarie’, ‘Forelle’ and ‘Early Bon Chretien’”
t0“PEAR”
e1“P-Ca was able to reduce shoot growth in all of the cultivars”
Claim · model-written summary
P-Ca improved fruit set in Forelle.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit set was improved in ‘Rosemarie’, ‘Forelle’ and ‘Early Bon Chretien’”
t0“PEAR”
e1“P-Ca was able to reduce shoot growth in all of the cultivars”
Claim · model-written summary
P-Ca improved fruit set in Early Bon Chretien.
- Taxon
- PEARPyrus communist0
- Material
- ‘Early Bon Chretien’e0
- Treatment
- P-Cae1
- Outcome
- Fruit sete0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit set was improved in ‘Rosemarie’, ‘Forelle’ and ‘Early Bon Chretien’”
t0“PEAR”
e1“P-Ca was able to reduce shoot growth in all of the cultivars”
Claim · model-written summary
Improved fruit set decreased final fruit size in Rosemarie.
- Taxon
- PEARPyrus communist0
- Material
- ‘Rosemarie’e0
- Organ / stage
- fruite0
- Outcome
- final fruit sizee0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which led to a decrease in final fruit size of ‘Rosemarie’”
t0“PEAR”
Claim · model-written summary
P-Ca decreased return bloom in Packham’s Triumph.
- Taxon
- PEARPyrus communist0
- Material
- ‘Packham’s Triumph’e0
- Treatment
- P-Cae0
- Outcome
- return bloome0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P-Ca caused a decrease in return bloom in ‘Packham’s Triumph’ and ‘Forelle’”
t0“PEAR”
Claim · model-written summary
P-Ca decreased return bloom in Forelle.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P-Ca caused a decrease in return bloom in ‘Packham’s Triumph’ and ‘Forelle’”
t0“PEAR”
Claim · model-written summary
Girdling reduced shoot growth in Forelle only.
- Taxon
- PEARPyrus communist0
- Material
- ‘Forelle’e0
- Treatment
- Girdlinge0
- Outcome
- shoot growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Girdling only reduced shoot growth in ‘Forelle’”
t0“PEAR”
Claim · model-written summary
Girdling did not improve fruit set in any cultivar.
- Taxon
- PEARPyrus communist0
- Treatment
- Girdlinge0
- Outcome
- fruit sete0
- Direction
- did not improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Girdling only reduced shoot growth in ‘Forelle’ but did not improve fruit set in any of the cultivars”
t0“PEAR”
Claim · model-written summary
Girdling improved final fruit weight in Flamingo.
- Taxon
- PEARPyrus communist0
- Material
- ‘Flamingo’e0
- Treatment
- Girdlinge0
- Outcome
- final fruit weighte0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Girdling improved final fruit weight of ‘Flamingo’”
t0“PEAR”
Claim · model-written summary
Girdling increased fruit length in Early Bon Chretien.
- Taxon
- PEARPyrus communist0
- Material
- ‘Early Bon Chretien’e0
- Treatment
- Girdlinge1
- Outcome
- fruit lengthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased fruit length in ‘Early Bon Chretien’”
t0“PEAR”
e1“Girdling only reduced shoot growth in ‘Forelle’”
Claim · model-written summary
Girdling increased return bloom in all cultivars except Packham’s Triumph.
- Taxon
- PEARPyrus communist0
- Treatment
- Girdlinge1
- Outcome
- return bloome0
- Direction
- increasede0
- Qualifier
- except ‘Packham’s Triumph’e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased return bloom in all of the cultivars except ‘Packham’s Triumph’”
t0“PEAR”
e1“Girdling only reduced shoot growth in ‘Forelle’”
Claim · model-written summary
The cultivar ranking for P-Ca sensitivity was Rosemarie above Flamingo, Early Bon Chretien and Packham’s Triumph, above Forelle.
- Taxon
- PEARPyrus communist0
- Material
- ‘Rosemarie’e0
- Outcome
- sensitivitye1
- Direction
- higherinferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Rosemarie’ > ‘Flamingo’ = ‘Early Bon Chretien’ = ‘Packham’s Triumph’ > ‘Forelle’”
t0“PEAR”
e1“there was a marked difference in sensitivity towards different rates of P-Ca between the different cultivars”
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See all 14 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.