Abstract
A deficiency in selenium (Se) in the human diet is a worldwide problem. The intake of Se-rich vegetables can be a safe way to combat Se deficiency for humans. However, most leafy vegetables can accumulate a high content of nitrates, which poses a potential threat to human health. Light is an important environmental factor that regulates the uptake and distribution of mineral elements and nitrogen metabolism in plants. However, the effects of Se forms and light conditions, especially light spectra, on the uptake and translocation of Se and on nitrate reduction are poorly understood. In this study, lettuce (Lactuca sativa L.) was treated with exogenous Se applied as selenate (10 mmol L−1) and selenite (0.5 mmol L−1) and grown under five different light spectra: fluorescent light (FL), monochromatic red LED light (R), monochromatic blue LED light (B), and mixed red and blue LED light with a red to blue light ratio at 4 (R/B=4), 8 (R/B=8), and 12 (R/B=12), respectively. The effects of light spectra and Se forms on plant growth, photosynthetic performance, Se accumulation and nitrate reduction were investigated. The results showed that the light spectra and Se forms had significant interactions for plant growth, foliar Se accumulation and nitrate reduction. The Se concentration and nitrate content in the leaves were negatively correlated with the percentage of red light from the light sources. Compared to Se applied as selenite, exogenous Se applied as selenate was more effective in reducing nitrate via promoting nitrate reductase and glutamate synthase activities. The lowest nitrate content and highest plant biomass were observed under R/B=8 for both the selenate and selenite treatments. The significant effect of the light spectra on the root concentration factor and translocation factor of Se resulted in marked variations in the Se concentrations in the roots and leaves. Compared with FL, red and blue LED light led to significant decreases in the foliar Se concentration. The results from this study suggest that the light spectra can contribute to Se distribution and accumulation to produce vegetables with better food quality.
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Claims 11
Claim · model-written summary
Light spectra and selenium forms interacted significantly for lettuce growth, foliar selenium and nitrate reduction.
- Taxon
- lettuce (Lactuca sativa L.)
Lactuca sativat0 - Treatment
- light spectra and Se formse0
- Outcome
- plant growth, foliar Se accumulation and nitrate reductione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light spectra and Se forms had significant interactions for plant growth, foliar Se accumulation and nitrate reduction”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
Leaf selenium concentration was negatively correlated with red light percentage.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Organ / stage
- leavese0
- Treatment
- percentage of red lighte0
- Outcome
- Se concentratione0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Se concentration and nitrate content in the leaves were negatively correlated with the percentage of red light from the light sources”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
Leaf nitrate content was negatively correlated with red light percentage.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Organ / stage
- leavese0
- Treatment
- percentage of red lighte0
- Outcome
- nitrate contente0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Se concentration and nitrate content in the leaves were negatively correlated with the percentage of red light from the light sources”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
Selenate reduced nitrate more effectively than selenite.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Treatment
- Se applied as selenatee0
- Outcome
- nitratee0
- Direction
- reducinge0
- Comparator
- Se applied as selenitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to Se applied as selenite, exogenous Se applied as selenate was more effective in reducing nitrate via promoting nitrate reductase and glutamate synthase activities”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
Selenate promoted nitrate reductase and glutamate synthase activities relative to selenite.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Treatment
- Se applied as selenatee0
- Outcome
- nitrate reductase and glutamate synthase activitiese0
- Direction
- promotinge0
- Comparator
- Se applied as selenitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to Se applied as selenite, exogenous Se applied as selenate was more effective in reducing nitrate via promoting nitrate reductase and glutamate synthase activities”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
R/B=8 yielded the lowest nitrate content under both selenium forms.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Treatment
- R/B=8e0
- Outcome
- nitrate contente0
- Direction
- loweste0
- Qualifier
- for both the selenate and selenite treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest nitrate content and highest plant biomass were observed under R/B=8 for both the selenate and selenite treatments”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
R/B=8 yielded the highest plant biomass under both selenium forms.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Treatment
- R/B=8e0
- Outcome
- plant biomasse0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest nitrate content and highest plant biomass were observed under R/B=8 for both the selenate and selenite treatments”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
Light spectra significantly affected selenium root concentration factor and translocation factor.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Treatment
- light spectrae0
- Outcome
- root concentration factor and translocation factor of See0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The significant effect of the light spectra on the root concentration factor and translocation factor of Se resulted in marked variations in the Se concentrations in the roots and leaves”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
Light spectra caused marked variation in root and leaf selenium concentration.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Treatment
- light spectrae0
- Outcome
- Se concentrations in the roots and leavese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The significant effect of the light spectra on the root concentration factor and translocation factor of Se resulted in marked variations in the Se concentrations in the roots and leaves”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
Red and blue LEDs significantly decreased foliar selenium concentration relative to fluorescent light.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Treatment
- red and blue LED lighte0
- Outcome
- foliar Se concentratione0
- Direction
- decreasese0
- Comparator
- FLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with FL, red and blue LED light led to significant decreases in the foliar Se concentration”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
The authors suggest light spectra can improve vegetable food quality through selenium distribution and accumulation.
- Taxon
- lettuce (Lactuca sativa L.)Lactuca sativat0
- Outcome
- produce vegetables with better food qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light spectra can contribute to Se distribution and accumulation to produce vegetables with better food quality”
t0“lettuce (Lactuca sativa L.)”
The same questions in other papers
selenium atom · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
9 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
7 papers more in this group
See all 11 papers →selenate · nutrient: content · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- positive
selenium atom · physiology: enzyme activity · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- positive
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.