Abstract
Lettuce plants were grown at low (LL), middle (ML), and high light (HL) conditions to examine the relationship between photoacclimatory plasticity, light energy utilization, and antioxidant capacity. With the increase in light intensity from LL to ML, the energy flux via DeltapH- and xanthophylls-regulated thermal dissipation, fluorescence and constitutive thermal dissipation, and electron transport for photorespiratory carbon oxidation all increased significantly. However, plants at HL exhibited reduced electron transport for photosynthetic carbon reduction and decreased maximal photochemical efficiency of photosytem II (PSII) as compared to that at ML. Increasing light level significantly increased the alternative electron transport, O(2)(*-) production rate, and H(2)O(2) and malondialdehyde (MDA) contents followed by increased ferric reducing antioxidant power (FRAP) and activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), and glutathione reductase (GR). Moreover, plants exposed to HL showed higher nutritional value as indicated by the high contents of ascorbate, glutathione, carotenoids, and alpha-tocopherol. It was concluded that absorption of excess photon energy at high light was associated with increased antioxidant capacity and that produce quality could be improved by short-term exposure to suboptimum irradiance.
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Claims 11
Claim · model-written summary
Raising light from LL to ML significantly increased regulated thermal dissipation, fluorescence and constitutive dissipation, and photorespiratory electron transport.
- Taxon
- Lactuca sativa L.
Lactuca sativat0 - Treatment
- increase in light intensity from LL to MLe0
- Outcome
- energy flux via DeltapH- and xanthophylls-regulated thermal dissipation, fluorescence and constitutive thermal dissipation, and electron transport for photorespiratory carbon oxidatione0
- Direction
- increased significantlye0
- Comparator
- LLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the increase in light intensity from LL to ML, the energy flux via DeltapH- and xanthophylls-regulated thermal dissipation, fluorescence and constitutive thermal dissipation, and electron transport for photorespiratory carbon oxidation all increased significantly”
t0“Lactuca sativa L.”
Claim · model-written summary
HL reduced electron transport for photosynthetic carbon reduction and maximal PSII photochemical efficiency relative to ML.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- HLe0
- Outcome
- electron transport for photosynthetic carbon reduction and decreased maximal photochemical efficiency of photosytem II (PSII)e0
- Direction
- reducede0
- Comparator
- MLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants at HL exhibited reduced electron transport for photosynthetic carbon reduction and decreased maximal photochemical efficiency of photosytem II (PSII) as compared to that at ML”
t0“Lactuca sativa L.”
Claim · model-written summary
Increasing light significantly increased alternative electron transport and superoxide production.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Increasing light levele0
- Outcome
- alternative electron transport, O(2)(*-) production ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing light level significantly increased the alternative electron transport, O(2)(*-) production rate”
t0“Lactuca sativa L.”
Claim · model-written summary
Increasing light significantly increased hydrogen peroxide and malondialdehyde contents.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Increasing light levele0
- Outcome
- H(2)O(2) and malondialdehyde (MDA) contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing light level significantly increased the alternative electron transport, O(2)(*-) production rate, and H(2)O(2) and malondialdehyde (MDA) contents”
t0“Lactuca sativa L.”
Claim · model-written summary
Increasing light increased antioxidant reducing power.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Increasing light levele0
- Outcome
- ferric reducing antioxidant power (FRAP)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing light level significantly increased the alternative electron transport, O(2)(*-) production rate, and H(2)O(2) and malondialdehyde (MDA) contents followed by increased ferric reducing antioxidant power (FRAP)”
t0“Lactuca sativa L.”
Claim · model-written summary
Increasing light increased SOD, CAT and APX activities.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Increasing light levele0
- Outcome
- activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing light level significantly increased the alternative electron transport, O(2)(*-) production rate, and H(2)O(2) and malondialdehyde (MDA) contents followed by increased ferric reducing antioxidant power (FRAP) and activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), and glutathione reductase (GR)”
t0“Lactuca sativa L.”
Claim · model-written summary
Increasing light increased MDHAR, DHAR and GR activities.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- Increasing light levele0
- Outcome
- monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), and glutathione reductase (GR)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing light level significantly increased the alternative electron transport, O(2)(*-) production rate, and H(2)O(2) and malondialdehyde (MDA) contents followed by increased ferric reducing antioxidant power (FRAP) and activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), and glutathione reductase (GR)”
t0“Lactuca sativa L.”
Claim · model-written summary
HL raised ascorbate, glutathione and carotenoid contents.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- HLe0
- Outcome
- contents of ascorbate, glutathione, carotenoidse0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants exposed to HL showed higher nutritional value as indicated by the high contents of ascorbate, glutathione, carotenoids, and alpha-tocopherol”
t0“Lactuca sativa L.”
Claim · model-written summary
HL raised alpha-tocopherol content.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- HLe0
- Outcome
- alpha-tocopherole0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants exposed to HL showed higher nutritional value as indicated by the high contents of ascorbate, glutathione, carotenoids, and alpha-tocopherol”
t0“Lactuca sativa L.”
Claim · model-written summary
Excess photon absorption at high light was associated with increased antioxidant capacity.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- excess photon energy at high lighte0
- Outcome
- antioxidant capacitye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“absorption of excess photon energy at high light was associated with increased antioxidant capacity”
t0“Lactuca sativa L.”
Claim · model-written summary
The authors concluded short-term suboptimum irradiance could improve produce quality.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Outcome
- produce quality could be improved by short-term exposure to suboptimum irradiancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“produce quality could be improved by short-term exposure to suboptimum irradiance”
t0“Lactuca sativa L.”
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