Abstract
Red and blue light are the most important light spectra for driving photosynthesis to produce adequate crop yield. It is also believed that green light may contribute to adaptations to growth. However, the effects of green light, which can trigger specific and necessary responses of plant growth, have been underestimated in the past. In this study, lettuce ( Lactuca sativa L.) was exposed to different continuous light (CL) conditions for 48 h by a combination of red and blue light‐emitting diodes (LEDs) supplemented with or without green LEDs, in an environmental‐controlled growth chamber. Green light supplementation enhanced photosynthetic capacity by increasing net photosynthetic rates, maximal photochemical efficiency, electron transport for carbon fixation (J PSII ) and chlorophyll content in plants under the CL treatment. Green light decreased malondialdehyde and H 2 O 2 accumulation by increasing the activities of superoxide dismutase (EC 1.15.1.1) and ascorbate peroxidase (EC 1.11.1.11) after 24 h of CL. Supplemental green light significantly increased the expression of photosynthetic genes LHCb and Psb A from 6 to 12 h, and these gene expressions were maintained at higher levels than those under other light conditions between 12 and 24 h. However, a notable downregulation of both LHCb and Psb A was observed during 24 to 48 h. These results indicate that the effects of green light on lettuce plant growth, via enhancing activity of particular components of antioxidative enzyme system and promoting of LHCb and Psb A expression to maintain higher photosynthetic capacity, alleviated a number of the negative effects caused by CL.
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Claims 8
Claim · model-written summary
Green light supplementation increased net photosynthetic rates and maximal photochemical efficiency of lettuce under continuous light.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- Green light supplementatione1
- Outcome
- net photosynthetic rates, maximal photochemical efficiencye1
- Direction
- increasinge1
- Qualifier
- under the CL treatmente1
- Comparator
- without green LEDse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa L.) was exposed”
e1“Green light supplementation enhanced photosynthetic capacity by increasing net photosynthetic rates, maximal photochemical efficiency, electron transport for carbon fixation (J PSII ) and chlorophyll content in plants under the CL treatment”
e2“supplemented with or without green LEDs”
Claim · model-written summary
Green light supplementation increased electron transport for carbon fixation (J PSII) and chlorophyll content in lettuce under continuous light.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Green light supplementatione1
- Outcome
- electron transport for carbon fixation (J PSII ) and chlorophyll contente1
- Direction
- increasinge1
- Qualifier
- under the CL treatmente1
- Comparator
- without green LEDse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa L.) was exposed”
e1“Green light supplementation enhanced photosynthetic capacity by increasing net photosynthetic rates, maximal photochemical efficiency, electron transport for carbon fixation (J PSII ) and chlorophyll content in plants under the CL treatment”
e2“supplemented with or without green LEDs”
Claim · model-written summary
Green light decreased malondialdehyde and H2O2 accumulation in lettuce after 24 h of continuous light.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Green lighte3
- Outcome
- malondialdehyde and H 2 O 2 accumulatione3
- Direction
- decreasede3
- Qualifier
- after 24 h of CLe3
- Comparator
- without green LEDse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa L.) was exposed”
e2“supplemented with or without green LEDs”
e3“Green light decreased malondialdehyde and H 2 O 2 accumulation by increasing the activities of superoxide dismutase (EC 1.15.1.1) and ascorbate peroxidase (EC 1.11.1.11) after 24 h of CL”
Claim · model-written summary
Green light increased the activities of superoxide dismutase and ascorbate peroxidase in lettuce after 24 h of continuous light.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Green lighte3
- Gene
- superoxide dismutase (EC 1.15.1.1) and ascorbate peroxidase (EC 1.11.1.11)e3
- Outcome
- activitiese3
- Direction
- increasinge3
- Qualifier
- after 24 h of CLe3
- Comparator
- without green LEDse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa L.) was exposed”
e2“supplemented with or without green LEDs”
e3“Green light decreased malondialdehyde and H 2 O 2 accumulation by increasing the activities of superoxide dismutase (EC 1.15.1.1) and ascorbate peroxidase (EC 1.11.1.11) after 24 h of CL”
Claim · model-written summary
Supplemental green light significantly increased expression of LHCb and PsbA from 6 to 12 h.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Supplemental green lighte4
- Gene
- LHCb and Psb Ae4
- Outcome
- expression of photosynthetic genese4
- Direction
- increasede4
- Qualifier
- from 6 to 12 he4
- Comparator
- without green LEDse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa L.) was exposed”
e2“supplemented with or without green LEDs”
e4“Supplemental green light significantly increased the expression of photosynthetic genes LHCb and Psb A from 6 to 12 h”
Claim · model-written summary
Green light maintained higher LHCb and PsbA expression than other light conditions between 12 and 24 h.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Supplemental green lighte4
- Gene
- LHCb and Psb Ae4
- Outcome
- gene expressionse5
- Direction
- highere5
- Qualifier
- between 12 and 24 he5
- Comparator
- other light conditionse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa L.) was exposed”
e4“Supplemental green light significantly increased the expression of photosynthetic genes LHCb and Psb A from 6 to 12 h”
e5“these gene expressions were maintained at higher levels than those under other light conditions between 12 and 24 h”
Claim · model-written summary
LHCb and PsbA expression was notably downregulated from 24 to 48 h.
- Taxon
- lettuceLactuca sativae0
- Gene
- LHCb and Psb Ae6
- Outcome
- downregulatione6
- Qualifier
- during 24 to 48 he6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa L.) was exposed”
e6“a notable downregulation of both LHCb and Psb A was observed during 24 to 48 h”
Claim · model-written summary
Green light alleviated negative effects of continuous light on lettuce, via antioxidant enzyme activity and LHCb and PsbA expression.
- Taxon
- lettuceLactuca sativae7
- Gene
- LHCb and Psb Ae7
- Outcome
- negative effects caused by CLe7
- Qualifier
- via enhancing activity of particular components of antioxidative enzyme systeme7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“These results indicate that the effects of green light on lettuce plant growth, via enhancing activity of particular components of antioxidative enzyme system and promoting of LHCb and Psb A expression to maintain higher photosynthetic capacity, alleviated a number of the negative effects caused by CL”
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See all 75 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.