Abstract
Abstract Tomato plants were grown in growth cabinets under two different light sources. One source consisted of white and red fluorescent tubes (Red cabinet), while the second consisted of both tungsten filament and fluorescent lamps (Far red cabinet). Energy fluence rates were adjusted to give equal photosynthetic rates in the two cabinets. Extension growth was approximately three times greater in the Far‐red cabinet. No difference could be detected in abscisic acid (ABA) levels in leaves or petioles of plants grown under the two light regimes, but levels were 40–90% greater in stems of the slower growing plants illuminated with fluorescent light only. Exogenously applied ABA effectively reduced the growth rate of the plants in the Far‐red cabinet to that of plants in the Red cabinet. However, it was shown that light‐induced changes in growth rates occurred before any change in endogenous ABA could be demonstrated, thus precluding a role for ABA in the initial response to a change in light quality. The changed ABA levels appeared to be the result of a modified pathway of ABA degradation. Evidence is presented for a novel metabolite of ABA which yields free ABA on basic hydrolysis.
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Claims 7
Claim · model-written summary
Extension growth was about three times greater under the far-red cabinet light source than under the red cabinet light source.
- Taxon
- Tomato plants
Solanum lycopersicume0 - Treatment
- both tungsten filament and fluorescent lampse2
- Outcome
- Extension growthe1
- Direction
- greatere1
- Value
- approximately three timese1
- Comparator
- Red cabinete2
- Setting
- growth cabinetse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants were grown in growth cabinets under two different light sources”
e1“Extension growth was approximately three times greater”
e2“One source consisted of white and red fluorescent tubes (Red cabinet), while the second consisted of both tungsten filament and fluorescent lamps (Far red cabinet)”
Claim · model-written summary
No difference was detected in ABA levels in leaves or petioles between the two light regimes.
- Taxon
- Tomato plantsSolanum lycopersicume0
- Organ / stage
- leaves or petiolese3
- Treatment
- light regimese3
- Outcome
- abscisic acid (ABA) levelse3
- Direction
- No differencee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants were grown in growth cabinets under two different light sources”
e3“No difference could be detected in abscisic acid (ABA) levels in leaves or petioles of plants grown under the two light regimes”
Claim · model-written summary
ABA levels in stems were 40–90% greater in the slower growing plants illuminated with fluorescent light only.
- Taxon
- Tomato plantsSolanum lycopersicume0
- Organ / stage
- stemse4
- Treatment
- fluorescent light onlye4
- Outcome
- levelse4
- Direction
- greatere4
- Value
- 40–90%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants were grown in growth cabinets under two different light sources”
e4“levels were 40–90% greater in stems of the slower growing plants illuminated with fluorescent light only”
Claim · model-written summary
Exogenously applied ABA reduced the growth rate of far-red grown plants to that of red cabinet plants.
- Taxon
- Tomato plantsSolanum lycopersicume0
- Treatment
- Exogenously applied ABAe5
- Outcome
- growth ratee5
- Direction
- reducede5
- Comparator
- Red cabinete2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants were grown in growth cabinets under two different light sources”
e2“One source consisted of white and red fluorescent tubes (Red cabinet), while the second consisted of both tungsten filament and fluorescent lamps (Far red cabinet)”
e5“Exogenously applied ABA effectively reduced the growth rate”
Claim · model-written summary
Changes in growth rates occurred before any change in endogenous ABA could be demonstrated.
- Taxon
- Tomato plantsSolanum lycopersicume0
- Outcome
- changes in growth ratese6
- Qualifier
- occurred before any change in endogenous ABA could be demonstratede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants were grown in growth cabinets under two different light sources”
e6“changes in growth rates occurred before any change in endogenous ABA could be demonstrated”
Claim · model-written summary
The changed ABA levels appear to result from a modified pathway of ABA degradation.
- Taxon
- Tomato plantsSolanum lycopersicume0
- Outcome
- ABA levelse7
- Qualifier
- a modified pathway of ABA degradatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants were grown in growth cabinets under two different light sources”
e7“The changed ABA levels appeared to be the result of a modified pathway of ABA degradation”
Claim · model-written summary
A novel metabolite of ABA was identified that yields free ABA on basic hydrolysis.
- Taxon
- Tomato plantsSolanum lycopersicume0
- Outcome
- novel metabolite of ABAe1
- Qualifier
- yields free ABA on basic hydrolysise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants were grown in growth cabinets under two different light sources”
e1“Evidence is presented for a novel metabolite of ABA which yields free ABA on basic hydrolysis”
The same questions in other papers
light · physiology: hormones · Solanum lycopersicum (tomato)Positive and negative results
3 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.