Abstract
Advancements in light-emitting diode (LED) technology have made them a viable alternative to current lighting systems for both sole and supplemental lighting requirements. Understanding how wavelength specific LED lighting can affect plants is thus an area of great interest. Much research is available on the wavelength specific responses of leaves from multiple crops when exposed to long-term wavelength specific lighting. However, leaf measurements do not always extrapolate linearly to the complexities which are found within a whole plant canopy, namely mutual shading and leaves of different ages. Taken together, both tomato (Solanum lycopersicum) leaves under short-term illumination and lisianthus (Eustoma grandiflorum) and tomato whole plant (WP) diurnal patterns of plants acclimated to specific lighting indicate wavelength specific responses of both H2O and CO2 gas exchanges involved in the major growth parameters of a plant. Tomato leaves grown under a white light source indicated an increase in transpiration rate and internal CO2 concentration and a subsequent decrease in water-use-efficiency (WUE) when exposed to a blue LED light source compared to a green LED light source. Interestingly, the maximum photosynthetic rate was observed to be similar. Using plants grown under wavelength specific supplemental lighting in a greenhouse, a decrease in WP WUE was seen in both crops under both red-blue (RB) and red-white (RW) LEDs when compared to a high pressure sodium (HPS) light. Whole plant WUE was decreased by 31% under the RB LED treatment for both crops compared to the HPS treatment. Tomato WP WUE was decreased by 25% and lisianthus WP WUE was decreased by 15% when compared to the HPS treatment when grown under RW LED. The understanding of the effects of wavelength specific lighting on both leaf and WP gas exchange has significant implications on basic academic research as well as commercial greenhouse production.
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Claims 7
Claim · model-written summary
Blue rather than green light increased transpiration rate and internal CO2 concentration in white-grown tomato leaves.
- Taxon
- Tomato
Solanum lycopersicume0 - Organ / stage
- leavese0
- Treatment
- blue LED light sourcee0
- Outcome
- transpiration rate and internal CO2 concentratione0
- Direction
- increasee0
- Comparator
- green LED light sourcee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato leaves grown under a white light source indicated an increase in transpiration rate and internal CO2 concentration and a subsequent decrease in water-use-efficiency (WUE) when exposed to a blue LED light source compared to a green LED light source”
Claim · model-written summary
Blue rather than green light decreased water-use efficiency in white-grown tomato leaves.
- Taxon
- TomatoSolanum lycopersicume0
- Organ / stage
- leavese0
- Treatment
- blue LED light sourcee0
- Outcome
- water-use-efficiency (WUE)e0
- Direction
- decreasee0
- Comparator
- green LED light sourcee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato leaves grown under a white light source indicated an increase in transpiration rate and internal CO2 concentration and a subsequent decrease in water-use-efficiency (WUE) when exposed to a blue LED light source compared to a green LED light source”
Claim · model-written summary
Maximum photosynthetic rate was similar under blue and green light in tomato leaves.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- blue LED light sourcee1
- Outcome
- maximum photosynthetic ratee0
- Direction
- similare0
- Comparator
- green LED light sourcee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum photosynthetic rate was observed to be similar”
e1“blue LED light source compared to a green LED light source”
t0“Tomatoes”
Claim · model-written summary
Red-blue LED lighting decreased whole-plant water-use efficiency in tomato by 31% versus high-pressure sodium light.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- RB LED treatmente0
- Outcome
- Whole plant WUEe0
- Direction
- decreasede0
- Value
- 31%e0
- Comparator
- HPS treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Whole plant WUE was decreased by 31% under the RB LED treatment for both crops compared to the HPS treatment”
t0“Tomatoes”
Claim · model-written summary
Red-blue LED lighting decreased whole-plant water-use efficiency in lisianthus by 31% versus high-pressure sodium light.
Verbatim
e0“Whole plant WUE was decreased by 31% under the RB LED treatment for both crops compared to the HPS treatment”
t0“Lisianthus”
Claim · model-written summary
Red-white LED lighting decreased tomato whole-plant water-use efficiency by 25% versus high-pressure sodium light.
- Taxon
- TomatoSolanum lycopersicume0
- Treatment
- RW LEDe0
- Outcome
- WP WUEe0
- Direction
- decreasede0
- Value
- 25%e0
- Comparator
- HPS treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato WP WUE was decreased by 25% and lisianthus WP WUE was decreased by 15% when compared to the HPS treatment when grown under RW LED”
Claim · model-written summary
Red-white LED lighting decreased lisianthus whole-plant water-use efficiency by 15% versus high-pressure sodium light.
Verbatim
e0“Tomato WP WUE was decreased by 25% and lisianthus WP WUE was decreased by 15% when compared to the HPS treatment when grown under RW LED”
The same questions in other papers
light · physiology: water · Solanum lycopersicum (tomato)Positive and negative results
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- negative
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47 papers in the same direction as this paper · 65 reporting no difference from an alternative
- no effect
- positive
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See all 113 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.