Abstract
This study was planned to make clear whether the promotive effect of low temperature on the flower bud initiation in tobacco plants is exerted more in diurnal dark period or in light period. The material used was Bright Yellow, a Virginian variety, which had been grown in an air-conditioned glass-house under various photoperiod. The detailed design of experiment is given in Table 1. The results may be summarized as follows: 1) By the 1st experiment, wherein 12hours' light and dark period were alternated at either high (25°C) or low(13°C) temperatures, it was observed that the plant maintained constantly at the temperature initiated first the flower buds, while next was that grown under the low temperature for the light period and last was that under the high temperature for the dark period. No marked difference in response was recognized between the plant under the costant high temperature and that under the high temperature only for the light period. 2) Exposures to different lengths of illumination from 8 to 14 hours at constant high or low temperatures were given in the second experiment. It was proved that under the low temperature developmental response was accelerated regardless the day-length, while under the high temperature it was decidedly retarded under 12 or more hours' illumination, though not so much under 8 hours' illumination. 3) An experiment of various combinations of the length of photoperiods and the height of temperature was also performed. The result was that, the plant development was promot d by the low temperature for dark period regardless the day length just as by the constant low temperature. And the plot maintained at the high temperature during 8 hours' illumination and at the low temperature for dark period reached its flowering stage as rapidly as those which were subjected to the low temperature for light period or as that subjected to constant low temperature. On the other hand, the imilar plots illuminated however for periods longer than 8 hours showed retardation of bud formation. 4) The above results may suggest the fact that the promotive effect of low temperature upon flower initiation in tobacco plants is remarkable at a light period than at a dark period.
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Claims 10
Claim · model-written summary
Constant temperature produced the earliest flower bud initiation in the first experiment.
- Taxon
- Tobacco Plant
Nicotiana tabacumt0 - Outcome
- initiated first the flower budse0
- Direction
- firste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“the plant maintained constantly at the temperature initiated first the flower buds”
Claim · model-written summary
Low temperature during the light period produced the next earliest flower bud initiation.
- Taxon
- Tobacco PlantNicotiana tabacumt0
- Treatment
- low temperature for the light periode0
- Outcome
- nexte0
- Direction
- nexte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“while next was that grown under the low temperature for the light period”
Claim · model-written summary
High temperature during the dark period gave the latest flower bud initiation.
- Taxon
- Tobacco PlantNicotiana tabacumt0
- Treatment
- high temperature for the dark periode0
- Outcome
- laste0
- Direction
- laste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“last was that under the high temperature for the dark period”
Claim · model-written summary
Constant high temperature and high temperature only during the light period showed no marked difference.
- Taxon
- Tobacco PlantNicotiana tabacumt0
- Treatment
- high temperature only for the light periode0
- Outcome
- responsee0
- Direction
- No marked differencee0
- Comparator
- costant high temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“No marked difference in response was recognized between the plant under the costant high temperature and that under the high temperature only for the light period.”
Claim · model-written summary
Low temperature accelerated development regardless of day length.
- Taxon
- Tobacco PlantNicotiana tabacumt0
- Treatment
- low temperaturee0
- Outcome
- developmental responsee0
- Direction
- acceleratede0
- Qualifier
- regardless the day-lengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“under the low temperature developmental response was accelerated regardless the day-length”
Claim · model-written summary
At high temperature, at least 12 hours of light decidedly retarded development.
- Taxon
- Tobacco PlantNicotiana tabacumt0
- Treatment
- high temperaturee0
- Outcome
- ite0
- Direction
- retardede0
- Qualifier
- 12 or more hours' illuminatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“under the high temperature it was decidedly retarded under 12 or more hours' illumination”
Claim · model-written summary
At high temperature, development was less retarded under eight hours of light.
- Taxon
- Tobacco PlantNicotiana tabacumt0
- Outcome
- not so muche0
- Direction
- not so muche0
- Qualifier
- 8 hours' illuminatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“though not so much under 8 hours' illumination”
Claim · model-written summary
Low temperature during the dark period promoted development regardless of day length.
- Taxon
- Tobacco PlantNicotiana tabacumt0
- Treatment
- low temperature for dark periode0
- Outcome
- plant developmente0
- Direction
- promot de0
- Qualifier
- regardless the day lengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“plant development was promot d by the low temperature for dark period regardless the day length just as by the constant low temperature”
Claim · model-written summary
Eight hours of high temperature light followed by low temperature darkness reached flowering as rapidly as low temperature light or constant low temperature.
- Taxon
- Tobacco PlantNicotiana tabacumt0
- Treatment
- high temperature during 8 hours' illumination and at the low temperature for dark periode0
- Outcome
- flowering stagee0
- Direction
- as rapidlye0
- Comparator
- constant low temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“the high temperature during 8 hours' illumination and at the low temperature for dark period reached its flowering stage as rapidly as those which were subjected to the low temperature for light period or as that subjected to constant low temperature”
Claim · model-written summary
Similar regimes with more than eight hours of illumination retarded bud formation.
- Taxon
- Tobacco PlantNicotiana tabacumt0
- Treatment
- periods longer than 8 hourse0
- Outcome
- bud formatione0
- Direction
- retardatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plant”
e0“plots illuminated however for periods longer than 8 hours showed retardation of bud formation”