Abstract
Artificial light source is one of the most important factors for high quality and quantity vegetable production in a plant factory. Aiming to investigate the role of light spectra on growth, chlorophyll fluorescence, photosynthesis and stomata parameters in lettuce plants grown in a plant factory, a factorial experiment was conducted based on a completely randomized design with two lettuce cultivars (Lollo Rossa and Lollo Bionda) and four spectra LED illumination red (656 nm), red/blue (3:1) (656 nm), blue (450 nm) and white (449 nm). The results showed that the combination of red and blue LED light had the greatest effect on stomatal conductance (gs), number of stomata, length and width of stomata in both lettuce cultivars. Also the maximum substomatal CO2 concentration (Ci) was observed in both lettuce cultivars when they were treated with red LED light. The results also showed that the maximum CO2 assimilation rate (PN) was observed in Rossa variety under white LED and in Bionda cultivar under blue LED light. Contrary to the results related to some of photosynthetic parameters, the highest values of vegetative traits (plant height, dry and fresh mass of shoots and roots, leaf number and leaf area) of plants were observed in the treatment of red and blue light combination. It is concluded that plant growth, chlorophyll fluorescence characteristics, photosynthetic and stomatal properties can be affected by different spectra and cultivars of lettuce, so that the choice of proper lighting is a fundamental requirement for the cultivation of this plant
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Claims 5
Claim · model-written summary
Combined red and blue LED light had the greatest effect on stomatal conductance and stomatal number and dimensions in both lettuce cultivars.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- combination of red and blue LED lighte0
- Outcome
- stomatal conductance (gs), number of stomata, length and width of stomatae0
- Direction
- greatest effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the combination of red and blue LED light had the greatest effect on stomatal conductance (gs), number of stomata, length and width of stomata in both lettuce cultivars”
Claim · model-written summary
Red LED light produced the maximum substomatal CO2 concentration in both lettuce cultivars.
- Taxon
- lettuceLactuca sativae0
- Treatment
- red LED lighte0
- Outcome
- substomatal CO2 concentration (Ci)e0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum substomatal CO2 concentration (Ci) was observed in both lettuce cultivars when they were treated with red LED light”
Claim · model-written summary
White LED light produced the maximum CO2 assimilation rate in Rossa.
- Taxon
- lettuceLactuca sativat0
- Material
- Rossa varietye0
- Treatment
- white LEDe0
- Outcome
- CO2 assimilation rate (PN)e0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum CO2 assimilation rate (PN) was observed in Rossa variety under white LED”
t0“lettuce”
Claim · model-written summary
Blue LED light produced the maximum CO2 assimilation rate in Bionda.
- Taxon
- lettuceLactuca sativat0
- Material
- Bionda cultivare0
- Treatment
- blue LED lighte0
- Outcome
- CO2 assimilation rate (PN)e1
- Direction
- maximume1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Bionda cultivar under blue LED light”
e1“The results also showed that the maximum CO2 assimilation rate (PN) was observed in Rossa variety under white LED and in Bionda cultivar under blue LED light.”
t0“lettuce”
Claim · model-written summary
The red and blue light combination gave the highest vegetative trait values.
- Taxon
- lettuceLactuca sativat0
- Treatment
- red and blue light combinatione0
- Outcome
- plant height, dry and fresh mass of shoots and roots, leaf number and leaf areae0
- Direction
- highest valuese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest values of vegetative traits (plant height, dry and fresh mass of shoots and roots, leaf number and leaf area) of plants were observed in the treatment of red and blue light combination”
t0“lettuce”
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