Abstract
In order to inhibit spindling growth and improve quality of cucumber seedlings under low irradiance, effects of supplemental light-emitting diodes (LED) light (SL) on morphological and physiological characteristics of cucumber seedlings at different growth stages under extremely low irradiance (ELI) were investigated. Supplementary monochromatic, dichromatic and trichromatic LED light on cucumber seedlings were conducted in experiment one, and supplements of combination ratios and intensity of blue and red LED light (RB) were conducted in experiment two. The morphological and physiological parameters of cucumber seedlings were promoted effectively by supplemental monochromatic red light or dichromatic containing red light (RB and RG) under ELI as early as one-leaf seedling stage, as demonstrated by suppressed length of hypocotyl and first internode, increased stem diameter and biomass, higher net photosynthetic rate (Pn) and soluble sugar content. Monochromatic or additional green light was not beneficial to cucumber seedlings under the ELI. The length of shoot and hypocotyl decreased, while stem diameter and leaf area increased as early as one-leaf seedling stage by RB SL. Root activities, root–shoot ratio, activities of catalase (CAT) and peroxidase (POD), as well as palisade–spongy ratio in the leaf of cucumber seedlings were promoted effectively by increasing blue light proportion (1R1B/1R2B). Increasing light intensity (50/75) enhanced soluble sugar accumulation in leaves. There were synergistic effects of RB ratio and light intensity on increasing stem diameter, leaf area, seedling index and decreasing hypocotyl cell area of the vertical section. In conclusion, 1R2B-75 may be the optimal SL to inhibit spindling growth of cucumber seedlings under ELI condition.
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Claims 12
Claim · model-written summary
Red or red-containing supplemental light suppressed hypocotyl and first internode length.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- supplemental monochromatic red light or dichromatic containing red light (RB and RG)e0
- Outcome
- length of hypocotyl and first internodee0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The morphological and physiological parameters of cucumber seedlings were promoted effectively by supplemental monochromatic red light or dichromatic containing red light (RB and RG) under ELI as early as one-leaf seedling stage, as demonstrated by suppressed length of hypocotyl and first internode”
t0“Cucumber Seedlings”
Claim · model-written summary
Red or red-containing supplemental light increased stem diameter and biomass.
- Taxon
- cucumberCucumis sativust0
- Outcome
- stem diameter and biomasse0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased stem diameter and biomass”
t0“Cucumber Seedlings”
Claim · model-written summary
Red or red-containing supplemental light gave higher net photosynthetic rate and soluble sugar content.
- Taxon
- cucumberCucumis sativust0
- Outcome
- net photosynthetic rate (Pn) and soluble sugar contente0
- Direction
- highere0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher net photosynthetic rate (Pn) and soluble sugar content”
t0“Cucumber Seedlings”
Claim · model-written summary
Monochromatic or additional green light was not beneficial under extremely low irradiance.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Monochromatic or additional green lighte0
- Outcome
- not beneficial to cucumber seedlingse0
- Setting
- ELIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Monochromatic or additional green light was not beneficial to cucumber seedlings under the ELI”
Claim · model-written summary
Red-blue supplemental light decreased shoot and hypocotyl length.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- one-leaf seedling stagee0
- Treatment
- RB SLe0
- Outcome
- length of shoot and hypocotyle0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length of shoot and hypocotyl decreased, while stem diameter and leaf area increased as early as one-leaf seedling stage by RB SL”
t0“Cucumber Seedlings”
Claim · model-written summary
Red-blue supplemental light increased stem diameter and leaf area.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- one-leaf seedling stagee0
- Treatment
- RB SLe0
- Outcome
- stem diameter and leaf areae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stem diameter and leaf area increased as early as one-leaf seedling stage by RB SL”
t0“Cucumber Seedlings”
Claim · model-written summary
A higher blue-light proportion promoted root activity, root-shoot ratio and leaf palisade-spongy ratio.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- increasing blue light proportion (1R1B/1R2B)e0
- Outcome
- Root activities, root–shoot ratioe0
- Direction
- promoted effectivelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root activities, root–shoot ratio, activities of catalase (CAT) and peroxidase (POD), as well as palisade–spongy ratio in the leaf of cucumber seedlings were promoted effectively by increasing blue light proportion (1R1B/1R2B)”
Claim · model-written summary
A higher blue-light proportion promoted catalase and peroxidase activities and the leaf palisade-spongy ratio.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- increasing blue light proportion (1R1B/1R2B)e0
- Outcome
- activities of catalase (CAT) and peroxidase (POD), as well as palisade–spongy ratioe0
- Direction
- promoted effectivelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activities of catalase (CAT) and peroxidase (POD), as well as palisade–spongy ratio in the leaf of cucumber seedlings were promoted effectively by increasing blue light proportion (1R1B/1R2B)”
Claim · model-written summary
Increasing light intensity enhanced leaf soluble sugar accumulation.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Increasing light intensity (50/75)e0
- Outcome
- soluble sugar accumulation in leavese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing light intensity (50/75) enhanced soluble sugar accumulation in leaves”
t0“Cucumber Seedlings”
Claim · model-written summary
Red-blue ratio and light intensity synergistically increased stem diameter, leaf area and seedling index.
- Taxon
- cucumberCucumis sativust0
- Treatment
- RB ratio and light intensitye0
- Outcome
- stem diameter, leaf area, seedling indexe0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were synergistic effects of RB ratio and light intensity on increasing stem diameter, leaf area, seedling index and decreasing hypocotyl cell area of the vertical section”
t0“Cucumber Seedlings”
Claim · model-written summary
Red-blue ratio and light intensity synergistically decreased hypocotyl cell area.
- Taxon
- cucumberCucumis sativust0
- Treatment
- RB ratio and light intensitye0
- Outcome
- hypocotyl cell area of the vertical sectione0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RB ratio and light intensity on increasing stem diameter, leaf area, seedling index and decreasing hypocotyl cell area of the vertical section”
t0“Cucumber Seedlings”
Claim · model-written summary
The authors propose 1R2B-75 as the optimal supplemental light for limiting spindling.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- 1R2B-75 may be the optimal SL to inhibit spindling growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1R2B-75 may be the optimal SL to inhibit spindling growth of cucumber seedlings under ELI condition”
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