Abstract
Field production of decorative pumpkins ( Cucurbita pepo L.) in New York occasionally results in markedly delayed fruit production in spite of normal vine growth. These episodes of fruitlessness appear to be associated with periods of high temperatures. To determine the link between temperature and pumpkin flowering and fruiting, a series of multilocational field trials and confirmatory greenhouse experiments were carried out. The field trials were conducted in the summer seasons of 1996 and 1997 in Ithaca and Albany, N.Y.; Queenstown, Md.; and Bradenton, Fla.; and in Ithaca and Bradenton in 1998. Mean growing season temperatures were 20, 21, 24 and 28 °C, respectively, at the four locations in 1996 and 1997. Delay in fruit formation was indicated by the main stem node number at which the first fruit developed. In Ithaca and Albany, the six cultivars formed their first fruit at node 17, but fruit production shifted to node 24 at Queenstown, and to node 26 or more at Bradenton. The prolonged delay in fruiting at the warmest site resulted in a 74% decrease in total yield of the C. pepo cultivars in 1996 and 1997, compared to Ithaca and Queenstown. In contrast, the yields and yield components of the C. maxima cultivar Prizewinner were similar at all four sites. Greenhouse trials in which `Howden' and `Baby Bear' were grown at 32/27, 25/20, and 20/15 °C confirmed that high temperatures delay formation and anthesis of female flowers. This and other published work indicates that there are genetic differences in susceptibility to high temperature flower delay that could be exploited to improve pumpkin performance.
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Claims 8
Claim · model-written summary
In Ithaca and Albany, the six pumpkin cultivars first fruited at node 17.
- Taxon
- Cucurbita pepo L.
Cucurbita pepoe0 - Outcome
- first fruite1
- Value
- node 17e1
- Setting
- Ithaca and Albanye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field production of decorative pumpkins ( Cucurbita pepo L.) in New York”
e1“In Ithaca and Albany, the six cultivars formed their first fruit at node 17”
Claim · model-written summary
At Queenstown, fruit production shifted to node 24.
- Taxon
- Cucurbita pepo L.Cucurbita pepoe0
- Outcome
- fruit productione2
- Value
- node 24e2
- Setting
- Queenstowne2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field production of decorative pumpkins ( Cucurbita pepo L.) in New York”
e2“fruit production shifted to node 24 at Queenstown, and to node 26 or more at Bradenton”
Claim · model-written summary
At Bradenton, fruit production shifted to node 26 or more.
- Taxon
- Cucurbita pepo L.Cucurbita pepoe0
- Outcome
- fruit productione2
- Value
- node 26 or moree2
- Setting
- Bradentone2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field production of decorative pumpkins ( Cucurbita pepo L.) in New York”
e2“fruit production shifted to node 24 at Queenstown, and to node 26 or more at Bradenton”
Claim · model-written summary
The warmest site reduced total yield of C. pepo cultivars by 74% in 1996 and 1997 compared with Ithaca and Queenstown.
- Taxon
- C. pepo cultivarsCucurbita pepoe3
- Treatment
- warmest sitee3
- Outcome
- total yielde3
- Direction
- decreasee3
- Value
- 74%e3
- Qualifier
- in 1996 and 1997e3
- Comparator
- Ithaca and Queenstowne3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The prolonged delay in fruiting at the warmest site resulted in a 74% decrease in total yield of the C. pepo cultivars in 1996 and 1997, compared to Ithaca and Queenstown”
Claim · model-written summary
Yields and yield components of C. maxima cultivar Prizewinner were similar at all four sites.
- Taxon
- C. maxima cultivar Prizewinner
Cucurbita maximae4 - Outcome
- yields and yield componentse4
- Qualifier
- similare4
- Setting
- all four sitese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the yields and yield components of the C. maxima cultivar Prizewinner were similar at all four sites”
Claim · model-written summary
In greenhouse trials, high temperature of 32/27 °C delayed formation and anthesis of female flowers of Howden compared with 20/15 °C.
- Taxon
- Cucurbita pepo L.Cucurbita pepoe0
- Material
- Howdene5
- Treatment
- 32/27, 25/20, and 20/15 °Ce5
- Outcome
- formation and anthesis of female flowerse5
- Direction
- delaye5
- Comparator
- 20/15 °Ce5
- Setting
- Greenhousee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field production of decorative pumpkins ( Cucurbita pepo L.) in New York”
e5“Greenhouse trials in which `Howden' and `Baby Bear' were grown at 32/27, 25/20, and 20/15 °C confirmed that high temperatures delay formation and anthesis of female flowers”
Claim · model-written summary
Pumpkin genotypes differ genetically in susceptibility to high-temperature flower delay.
Verbatim
e6“there are genetic differences in susceptibility to high temperature flower delay that could be exploited to improve pumpkin performance”
Claim · model-written summary
Genetic differences in heat-related flower delay could be exploited to improve pumpkin performance.
Verbatim
e6“there are genetic differences in susceptibility to high temperature flower delay that could be exploited to improve pumpkin performance”