Abstract
1. Biloxi soybeans were grown in the greenhouse for four to five weeks and transferred to a series of control rooms where various combinations of temperature during the photoperiod and the dark period were applied for five days. Photoperiods of both 8 and 16 hours were used. 2. The effect of these various temperatures on the initiation of flower primordia has been determined. 3. Initiation of flower primordia was influenced to a much greater extent by variation in temperature during the dark period than by variation during the photoperiod. 4. When the temperature during the photoperiod was constant, a 55⚬ temperature during the dark period limited the amount of initiation that occurred. At 65⚬ initiation was much more extensive. This rise of 10⚬ in temperature during the dark period produced a greater difference in initiation than any other temperature variation of the same amount. 5. Variation in temperature resulted in the formation of different numbers of nodes. These differences, however, were not great enough to account for the differences in floral initiation. 6. Other measurements, such as fresh and dry weights, stem lengths, and leaf areas, were made. All were influenced by the different temperature treatments. 7. The carbohydrate and nitrogen content of the plants was also influenced greatly by the different temperature treatments. As the temperature during the dark period was increased the carbohydrates decreased and the nitrogen fractions increased. These changes in carbohydrate and nitrogen metabolism could not be correlated with the morphological responses. 8. None of the temperature combinations used in these experiments brought about the initiation of flower primordia when photoperiods of 16 hours were used.
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Claims 11
Claim · model-written summary
Flower primordia initiation in Biloxi soybean was influenced much more by temperature variation in the dark period than during the photoperiod.
Verbatim
e0“Initiation of flower primordia was influenced to a much greater extent by variation in temperature during the dark period than by variation during the photoperiod”
t0“Biloxi Soybean”
Claim · model-written summary
With constant photoperiod temperature, a 55 degree dark-period temperature limited the amount of flower initiation.
- Taxon
- Biloxi Soybeant0
- Treatment
- 55⚬ temperature during the dark periode0
- Outcome
- amount of initiatione0
- Direction
- limitede0
- Qualifier
- the temperature during the photoperiod was constante0
Not reportedComparator
Verbatim
e0“When the temperature during the photoperiod was constant, a 55⚬ temperature during the dark period limited the amount of initiation that occurred”
t0“Biloxi Soybean”
Claim · model-written summary
A 65 degree dark-period temperature gave much more extensive flower initiation than 55 degrees.
Verbatim
e0“a 55⚬ temperature during the dark period limited the amount of initiation that occurred. At 65⚬ initiation was much more extensive”
t0“Biloxi Soybean”
Claim · model-written summary
The 10 degree rise in dark-period temperature produced a greater difference in initiation than any other temperature variation of the same size.
Verbatim
e0“This rise of 10⚬ in temperature during the dark period produced a greater difference in initiation than any other temperature variation of the same amount”
t0“Biloxi Soybean”
Claim · model-written summary
Temperature variation resulted in different numbers of nodes, but the differences were not great enough to account for the differences in floral initiation.
Not reportedDirection
Verbatim
e0“Variation in temperature resulted in the formation of different numbers of nodes. These differences, however, were not great enough to account for the differences in floral initiation”
t0“Biloxi Soybean”
Claim · model-written summary
Fresh and dry weights were influenced by the different temperature treatments.
Not reportedComparatorDirection
Verbatim
e0“Other measurements, such as fresh and dry weights, stem lengths, and leaf areas, were made. All were influenced by the different temperature treatments”
t0“Biloxi Soybean”
Claim · model-written summary
Stem lengths and leaf areas were influenced by the different temperature treatments.
- Taxon
- Biloxi Soybeant0
- Treatment
- different temperature treatmentse0
- Outcome
- stem lengths, and leaf arease0
Not reportedComparatorDirection
Verbatim
e0“Other measurements, such as fresh and dry weights, stem lengths, and leaf areas, were made. All were influenced by the different temperature treatments”
t0“Biloxi Soybean”
Claim · model-written summary
Carbohydrate content decreased as dark-period temperature was increased.
- Taxon
- Biloxi Soybeant0
- Treatment
- temperature during the dark period was increasede0
- Outcome
- carbohydratese0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“As the temperature during the dark period was increased the carbohydrates decreased and the nitrogen fractions increased”
t0“Biloxi Soybean”
Claim · model-written summary
Nitrogen fractions increased as dark-period temperature was increased.
- Taxon
- Biloxi Soybeant0
- Treatment
- temperature during the dark period was increasede0
- Outcome
- nitrogen fractionse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“As the temperature during the dark period was increased the carbohydrates decreased and the nitrogen fractions increased”
t0“Biloxi Soybean”
Claim · model-written summary
Changes in carbohydrate and nitrogen metabolism could not be correlated with the morphological responses.
- Taxon
- Biloxi Soybeant0
- Outcome
- changes in carbohydrate and nitrogen metabolisme0
- Comparator
- morphological responsese0
Not reportedDirection
Verbatim
e0“These changes in carbohydrate and nitrogen metabolism could not be correlated with the morphological responses”
t0“Biloxi Soybean”
Claim · model-written summary
No temperature combination induced flower primordia under 16-hour photoperiods.
- Taxon
- Biloxi Soybeant0
- Treatment
- temperature combinationse0
- Outcome
- initiation of flower primordiae0
- Direction
- no_changeinferrede0
- Qualifier
- photoperiods of 16 hourse0
Not reportedComparator
Verbatim
e0“None of the temperature combinations used in these experiments brought about the initiation of flower primordia when photoperiods of 16 hours were used”
t0“Biloxi Soybean”