Abstract
Vegetables are a large source of nitrate (NO3−) in our diet. As NO2− is toxic to humans, it is undesirable to consume vegetables with high NO3− content. Therefore, this study aimed to investigate the effect of supplementing of red- and blue-LED lighting to B. alboglabra grown in the tropical greenhouse in terms of moderating NO3− accumulation, improving photosynthesis, and enhancing productivity. All plants were grown hydroponically in full nutrients under prevailing greenhouse conditions for 20 days (full sunlight). Thereafter, plants were subjected to three different light treatments for 12 days: full sunlight, shade, and shade supplemented with LEDs. The average midday photosynthetic photon flux density (PPFD) during the light treatment periods were 220 μmol m−2 s−1 (full sunlight), 55 μmol m−2 s−1 (shade), and 220 μmol m−2 s−1 (shade supplemented with LEDs). Shoot nitrate (NO3−) concentration increased significantly in plants grown in the shade. However, shoot NO3− concentration was reduced when plants were supplemented with red- and blue-LED lighting. Photosynthetic CO2 assimilation, stomatal conductance, and productivity also improved in these plants. Our results suggest that supplemental red- and blue-LED lighting in a tropical greenhouse during periods of cloudy and hazy weather could improve productivity and nutrient quality of Chinese broccoli.
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Claims 6
Claim · model-written summary
Shade significantly increased shoot nitrate concentration.
- Taxon
- Brassica alboglabra
Brassica oleracea var. alboglabrat0 - Treatment
- shadee0
- Outcome
- Shoot nitrate (NO3−) concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot nitrate (NO3−) concentration increased significantly in plants grown in the shade.”
t0“Brassica alboglabra grown under low light with supplemental LED lighting”
Claim · model-written summary
Supplemental red and blue LEDs reduced shoot nitrate concentration.
- Taxon
- Brassica alboglabraBrassica oleracea var. alboglabrat0
- Treatment
- red- and blue-LED lightinge0
- Outcome
- shoot NO3− concentratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, shoot NO3− concentration was reduced when plants were supplemented with red- and blue-LED lighting.”
t0“Brassica alboglabra grown under low light with supplemental LED lighting”
Claim · model-written summary
Supplemental LED lighting improved Photosynthetic CO2 assimilation.
- Taxon
- Brassica alboglabraBrassica oleracea var. alboglabrat0
- Treatment
- supplemental LED lightingt0
- Outcome
- Photosynthetic CO2 assimilatione0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic CO2 assimilation, stomatal conductance, and productivity also improved in these plants.”
t0“Brassica alboglabra grown under low light with supplemental LED lighting”
Claim · model-written summary
Supplemental LED lighting improved stomatal conductance.
- Taxon
- Brassica alboglabraBrassica oleracea var. alboglabrat0
- Treatment
- supplemental LED lightingt0
- Outcome
- stomatal conductancee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic CO2 assimilation, stomatal conductance, and productivity also improved in these plants.”
t0“Brassica alboglabra grown under low light with supplemental LED lighting”
Claim · model-written summary
Supplemental LED lighting improved productivity.
- Taxon
- Brassica alboglabraBrassica oleracea var. alboglabrat0
- Treatment
- supplemental LED lightingt0
- Outcome
- productivitye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic CO2 assimilation, stomatal conductance, and productivity also improved in these plants.”
t0“Brassica alboglabra grown under low light with supplemental LED lighting”
Claim · model-written summary
The authors propose supplemental red and blue LEDs during cloudy or hazy periods to improve Chinese broccoli productivity and nutrient quality.
- Taxon
- Brassica alboglabraBrassica oleracea var. alboglabrat0
- Treatment
- supplemental red- and blue-LED lightinge0
- Outcome
- improve productivity and nutrient qualitye0
- Qualifier
- during periods of cloudy and hazy weathere0
- Setting
- tropical greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplemental red- and blue-LED lighting in a tropical greenhouse during periods of cloudy and hazy weather could improve productivity and nutrient quality of Chinese broccoli”
t0“Brassica alboglabra grown under low light with supplemental LED lighting”
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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.