Abstract
Continuous-recording photometers were used to measure the amounts of light entering a glasshouse during certain growth periods of young tomato plants. Fresh and dry weights of the tops of the plants and the number of days between cotyledon expansion and anthesis of the first flower of the first inflorescence were related to the recorded light values as follows :1. The relationship between log dry weight and the light-time integral was linear up to 220,000 foot candle hours, after which a marked reduction in growth occurred.2. The departure from linearity occurred at about the same light integral even when additional nutrients were supplied to the standard volume of compost, but was delayed when a larger container was used.3. The number of days to anthesis and the recorded light-time integrals show the following relationships : in winter, light integrals are constant (about 400,000 f.c.h.) while time is variable ; in summer, time is constant (about 40 days) while the light integrals are variable.4. In summer, neither the reduction of the natural day-length to 9 hours nor the reduction of the light intensity to 75% normal materially influenced the number of days to anthesis.It is concluded that in winter growth is limited by, and is therefore proportional to, the amount of available photosynthetic light, while in summer the young tomato is light-saturated and growth is limited by factors other than light.The results indicate that the amount of photosynthetic light is the major factor determining the seasonal pattern of days to anthesis. There was no indication of any photoperiodic response.
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Claims 12
Claim · model-written summary
Log dry weight rose linearly with light integral up to 220,000 foot candle hours.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- light-time integrale0
- Outcome
- log dry weighte0
- Value
- 220,000 foot candle hourse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between log dry weight and the light-time integral was linear up to 220,000 foot candle hours”
t0“tomato”
Claim · model-written summary
Growth markedly slowed above the 220,000 foot-candle-hour integral.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- growthe0
- Direction
- marked reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after which a marked reduction in growth occurred”
t0“tomato”
Claim · model-written summary
Extra nutrients did not shift the light integral where linear growth ended.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- additional nutrientse0
- Outcome
- departure from linearitye0
- Direction
- samee0
- Comparator
- standard volume of composte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The departure from linearity occurred at about the same light integral even when additional nutrients were supplied to the standard volume of compost”
t0“tomato”
Claim · model-written summary
A larger container delayed the departure from linear growth.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- larger containere0
- Outcome
- departure from linearitye0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The departure from linearity occurred at about the same light integral even when additional nutrients were supplied to the standard volume of compost, but was delayed when a larger container was used”
t0“tomato”
Claim · model-written summary
In winter, days to anthesis varied while light integral stayed near 400,000 f.c.h.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- light integralse0
- Value
- about 400,000 f.c.h.e0
- Qualifier
- in wintere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in winter, light integrals are constant (about 400,000 f.c.h.) while time is variable”
t0“tomato”
Claim · model-written summary
In summer, days to anthesis stayed near 40 days while light integrals varied.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- timee0
- Value
- about 40 dayse0
- Qualifier
- in summere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in summer, time is constant (about 40 days) while the light integrals are variable”
t0“tomato”
Claim · model-written summary
Reducing summer day length to nine hours did not materially change days to anthesis.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- reduction of the natural day-length to 9 hourse0
- Outcome
- number of days to anthesise0
- Comparator
- natural day-lengthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“neither the reduction of the natural day-length to 9 hours nor the reduction of the light intensity to 75% normal materially influenced the number of days to anthesis”
t0“tomato”
Claim · model-written summary
Reducing summer light intensity to 75% normal did not materially change days to anthesis.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- reduction of the light intensity to 75% normale0
- Outcome
- number of days to anthesise0
- Comparator
- normale0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nor the reduction of the light intensity to 75% normal materially influenced the number of days to anthesis”
t0“tomato”
Claim · model-written summary
Winter growth was proportional to available photosynthetic light.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- growthe0
- Qualifier
- amount of available photosynthetic lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in winter growth is limited by, and is therefore proportional to, the amount of available photosynthetic light”
t0“tomato”
Claim · model-written summary
Summer young tomato growth was light-saturated and limited by other factors.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- growth is limitede0
- Qualifier
- factors other than lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in summer the young tomato is light-saturated and growth is limited by factors other than light”
Claim · model-written summary
Photosynthetic light largely determined the seasonal pattern of days to anthesis.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- seasonal pattern of days to anthesise0
- Qualifier
- amount of photosynthetic lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of photosynthetic light is the major factor determining the seasonal pattern of days to anthesis”
t0“tomato”
Claim · model-written summary
No photoperiod response was indicated.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- photoperiodic responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no indication of any photoperiodic response.”
t0“tomato”
The same questions in other papers
light · phenology · Solanum lycopersicum (tomato)Positive and negative results
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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.