Abstract
Light is a vital regulator of photosynthesis, energy production, plant growth, and morphogenesis. Although these key physiological processes are well understood, the effects of light quality on the pigment content, oxidative stress, reactive oxygen species (ROS) production, antioxidant defense systems, and biomass yield of plants remain largely unexplored. In this study, we applied different light-emitting diode (LED) treatments, including white light, red light, blue light, and a red+blue (1:1) light combination, to evaluate the traits mentioned above in alfalfa (Medicago sativa L.). Fluorescence staining showed that red light significantly triggered the oxidative stress indicators compared to blue and white light, while the combined red and blue light treatment significantly reduced the ROS (O2•−, H2O2) intensity in alfalfa seedlings. Interestingly, the combined light treatment significantly boosted the seed germination rate (%), maximum photochemical quantum yield of PSII (Fv/Fm), leaf greenness (SPAD score), photosynthetic pigment levels (chlorophyll a, chlorophyll b, and carotenoids), and plant biomass yield in alfalfa seedlings. The red and/or combined (red+blue) light treatments significantly regulated antioxidant enzymes (SOD, CAT, APX, and GR) and the expression of genes related to the ascorbate–glutathione (AsA-GSH) pathway, including monodehydroascorbate reductase (MsMDHAR), dehydroascorbate reductase (MsDHAR), ascorbate peroxidase (MsAPX), and glutathione reductase (MsGR). These results indicate that light quality is crucial for regulating the morphological, physiological, and molecular traits linked to alfalfa improvement. These findings suggest a new approach to enhancing the adaptation, as well as the morphological and agronomic yield, of alfalfa and forage legumes through light-quality-mediated improvement.
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Claims 9
Claim · model-written summary
Red light, compared with blue and white light, significantly triggered oxidative stress indicators in alfalfa.
- Taxon
- Alfalfa
Medicago sativat0 - Treatment
- red lighte1
- Outcome
- oxidative stress indicatorse1
- Direction
- triggerede1
- Comparator
- blue and white lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“red light significantly triggered the oxidative stress indicators compared to blue and white light”
t0“Nutrient Acquisition in Alfalfa”
Claim · model-written summary
The combined red and blue light treatment significantly reduced ROS (O2•−, H2O2) intensity in alfalfa seedlings.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- seedlingse2
- Treatment
- combined red and blue light treatmente2
- Outcome
- ROS (O2•−, H2O2) intensitye2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“the combined red and blue light treatment significantly reduced the ROS (O2•−, H2O2) intensity in alfalfa seedlings”
t0“Nutrient Acquisition in Alfalfa”
Claim · model-written summary
The combined light treatment significantly boosted seed germination rate, maximum photochemical quantum yield of PSII (Fv/Fm) and leaf greenness (SPAD score) in alfalfa seedlings.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- seede3
- Treatment
- combined light treatmente3
- Outcome
- seed germination rate (%), maximum photochemical quantum yield of PSII (Fv/Fm), leaf greenness (SPAD score)e3
- Direction
- boostede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“the combined light treatment significantly boosted the seed germination rate (%), maximum photochemical quantum yield of PSII (Fv/Fm), leaf greenness (SPAD score), photosynthetic pigment levels (chlorophyll a, chlorophyll b, and carotenoids), and plant biomass yield in alfalfa seedlings”
t0“Nutrient Acquisition in Alfalfa”
Claim · model-written summary
The combined light treatment significantly boosted photosynthetic pigment levels (chlorophyll a, chlorophyll b and carotenoids) in alfalfa seedlings.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- seedlingse4
- Treatment
- combined light treatmente4
- Outcome
- photosynthetic pigment levels (chlorophyll a, chlorophyll b, and carotenoids)e4
- Direction
- boostede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the combined light treatment significantly boosted the seed germination rate (%), maximum photochemical quantum yield of PSII (Fv/Fm), leaf greenness (SPAD score), photosynthetic pigment levels (chlorophyll a, chlorophyll b, and carotenoids), and plant biomass yield in alfalfa seedlings”
t0“Nutrient Acquisition in Alfalfa”
Claim · model-written summary
The combined light treatment significantly boosted plant biomass yield of alfalfa seedlings.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- seedlingse5
- Treatment
- combined light treatmente5
- Outcome
- plant biomass yielde5
- Direction
- boostede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“the combined light treatment significantly boosted the seed germination rate (%), maximum photochemical quantum yield of PSII (Fv/Fm), leaf greenness (SPAD score), photosynthetic pigment levels (chlorophyll a, chlorophyll b, and carotenoids), and plant biomass yield in alfalfa seedlings”
t0“Nutrient Acquisition in Alfalfa”
Claim · model-written summary
Red and/or combined red+blue light significantly regulated antioxidant enzymes (SOD, CAT, APX and GR) in alfalfa.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- red and/or combined (red+blue) light treatmentse6
- Outcome
- antioxidant enzymes (SOD, CAT, APX, and GR)e6
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The red and/or combined (red+blue) light treatments significantly regulated antioxidant enzymes (SOD, CAT, APX, and GR)”
t0“Nutrient Acquisition in Alfalfa”
Claim · model-written summary
Red and/or combined red+blue light significantly regulated expression of monodehydroascorbate reductase and dehydroascorbate reductase genes of the ascorbate-glutathione pathway in alfalfa.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- red and/or combined (red+blue) light treatmentse7
- Gene
- monodehydroascorbate reductase (MsMDHAR), dehydroascorbate reductase (MsDHAR)e7
- Outcome
- expression of genes related to the ascorbate–glutathione (AsA-GSH) pathwaye7
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The red and/or combined (red+blue) light treatments significantly regulated antioxidant enzymes (SOD, CAT, APX, and GR) and the expression of genes related to the ascorbate–glutathione (AsA-GSH) pathway, including monodehydroascorbate reductase (MsMDHAR), dehydroascorbate reductase (MsDHAR)”
t0“Nutrient Acquisition in Alfalfa”
Claim · model-written summary
Red and/or combined red+blue light significantly regulated expression of ascorbate peroxidase and glutathione reductase genes of the ascorbate-glutathione pathway in alfalfa.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- red and/or combined (red+blue) light treatmentse7
- Gene
- ascorbate peroxidase (MsAPX), and glutathione reductase (MsGR)e7
- Outcome
- expression of genes related to the ascorbate–glutathione (AsA-GSH) pathwaye7
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The red and/or combined (red+blue) light treatments significantly regulated antioxidant enzymes (SOD, CAT, APX, and GR) and the expression of genes related to the ascorbate–glutathione (AsA-GSH) pathway, including monodehydroascorbate reductase (MsMDHAR), dehydroascorbate reductase (MsDHAR), ascorbate peroxidase (MsAPX), and glutathione reductase (MsGR)”
t0“Nutrient Acquisition in Alfalfa”
Claim · model-written summary
The authors suggest light-quality-mediated improvement as a new approach to enhancing the adaptation and yield of alfalfa and forage legumes.
- Taxon
- alfalfaMedicago sativae6
- Treatment
- light-quality-mediated improvemente6
- Outcome
- the morphological and agronomic yielde6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“These findings suggest a new approach to enhancing the adaptation, as well as the morphological and agronomic yield, of alfalfa and forage legumes through light-quality-mediated improvement”
The same questions in other papers
light · physiology: oxidative · Medicago sativa (alfalfa)Positive and negative results
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See all 7 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.