Abstract
The effects of additional far-red light (FRL) on the photosynthetic and growth parameters of Lactuca sativa plants grown for 30 d and on the photosynthetic activity of the plants under high irradiance [4 h; 1,500 μmol(photon) m-2 s-1] were studied. The plants were grown under coloured light-emitting diodes at a ratio of red light (RL): blue light (BL): green light (GL): far-red light (FRL) = 0.7:1:0.3:0.4 or RL:BL:GL:FRL = 0.7:1:0.3:0.8 (test, T). Additional FRL led to an increase in plant biomass, height, and leaf area but to a decrease in photosynthesis and respiration rates. However, PSII activity was greater in plants with additional FRL. It is suggested that the increase in biomass occurred mainly due to an increase in leaf area but not in photosynthesis. In addition, PSII in the experiment was less resistant to high irradiance. The possible direct and indirect influences of the FRL on growth and photosynthesis were considered.
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Claims 5
Claim · model-written summary
Additional FRL increased lettuce biomass, height and leaf area.
- Taxon
- Lactuca sativa
Lactuca sativae1 - Treatment
- Additional FRLe0
- Outcome
- plant biomass, height, and leaf areae0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additional FRL led to an increase in plant biomass, height, and leaf area”
e1“The effects of additional far-red light (FRL) on the photosynthetic and growth parameters of Lactuca sativa plants grown for 30 d”
Claim · model-written summary
Additional FRL decreased photosynthesis and respiration rates.
- Taxon
- Lactuca sativaLactuca sativae1
- Treatment
- FRLe2
- Outcome
- photosynthesis and respiration ratese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but to a decrease in photosynthesis and respiration rates”
e1“The effects of additional far-red light (FRL) on the photosynthetic and growth parameters of Lactuca sativa plants grown for 30 d”
e2“Additional FRL led to an increase in plant biomass, height, and leaf area”
Claim · model-written summary
PSII activity was greater with additional FRL.
- Taxon
- Lactuca sativaLactuca sativae1
- Treatment
- additional FRLe0
- Outcome
- PSII activitye0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PSII activity was greater in plants with additional FRL”
e1“The effects of additional far-red light (FRL) on the photosynthetic and growth parameters of Lactuca sativa plants grown for 30 d”
Claim · model-written summary
The authors suggest biomass rose mainly through increased leaf area.
- Taxon
- Lactuca sativaLactuca sativae1
- Outcome
- increase in biomasse0
- Qualifier
- increase in leaf area but not in photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is suggested that the increase in biomass occurred mainly due to an increase in leaf area but not in photosynthesis”
e1“The effects of additional far-red light (FRL) on the photosynthetic and growth parameters of Lactuca sativa plants grown for 30 d”
Claim · model-written summary
PSII was less resistant to high irradiance in the experiment.
- Taxon
- Lactuca sativaLactuca sativae1
- Treatment
- high irradiancee0
- Outcome
- PSIIe0
- Direction
- less resistante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PSII in the experiment was less resistant to high irradiance”
e1“The effects of additional far-red light (FRL) on the photosynthetic and growth parameters of Lactuca sativa plants grown for 30 d”
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