Abstract
Radiation intensity and carbon dioxide (CO2) concentration can be precisely controlled to manipulate plant yield and quality. Due to increased plant densities during seedling production, fewer inputs per plant are required, creating the potential to increase production efficiency. Therefore, the objectives of this research were to: 1) quantify the extent radiation intensity and CO2 concentration under sole-source lighting influence morphology and yield of sweet basil (Ocimum basilicum) seedlings, and 2) determine if differences in morphology, yield, and volatile organic compound (VOC) concentration persist after transplant in a common environment. Sweet basil 'Nufar' seedlings were grown in growth chambers with target CO2 concentrations of 500 or 1,000 μmol·mol‒1 under light-emitting diodes (LEDs) providing target photosynthetic photon flux densities (PPFD) of 100, 200, 400, or 600 μmol·m‒2·s‒1 for 16 h per day. After two weeks, seedlings were transplanted into a common greenhouse environment and grown until harvest. At transplant and three weeks after transplant (harvest), growth and developmental differences were quantified along with key terpenoid and phenylpropanoid concentrations at harvest. Radiation intensity and CO2 interacted influencing many aspects of plant morphology, though CO2 concentration effects were less pronounced than those of radiation intensity. As radiation intensity during seedling production increased from 100 to 600 μmol·m‒2·s‒1, basil seedlings were 38% taller, had a 713% larger leaf area, and had 65% thicker stems; at harvest, plants were 24% taller, had 56% more branches, 28% more nodes, 22% thicker stems, and weighed 80% more when fresh and dry. Additionally, after growing in a common environment for three weeks, eugenol concentration was greater in plants grown under a PPFD of 600 μmol·m‒2·s‒1 as seedlings compared to lower intensities. Therefore, increasing radiation intensity during seedling production under sole-source lighting can carry over to increase subsequent yield and eugenol concentration during finished production.
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Claims 10
Claim · model-written summary
Seedling radiation and CO2 interacted in their effects on basil morphology, with weaker CO2 effects.
- Taxon
- Basil
Ocimum basilicumt0 - Treatment
- Radiation intensity and CO2e0
- Outcome
- plant morphologye0
- Qualifier
- CO2 concentration effects were less pronounced than those of radiation intensitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Radiation intensity and CO2 interacted influencing many aspects of plant morphology, though CO2 concentration effects were less pronounced than those of radiation intensity”
t0“Basil”
Claim · model-written summary
Increasing seedling radiation intensity from 100 to 600 μmol·m‒2·s‒1 made seedlings 38% taller.
- Taxon
- BasilOcimum basilicumt0
- Organ / stage
- seedlingse0
- Treatment
- radiation intensity during seedling production increased from 100 to 600 μmol·m‒2·s‒1e0
- Outcome
- basil seedlingse0
- Direction
- tallere0
- Value
- 38%e0
- Comparator
- 100e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As radiation intensity during seedling production increased from 100 to 600 μmol·m‒2·s‒1, basil seedlings were 38% taller”
t0“Basil”
Claim · model-written summary
Higher seedling radiation produced a 713% larger seedling leaf area.
- Taxon
- BasilOcimum basilicumt0
- Organ / stage
- seedlingse0
- Treatment
- radiation intensity during seedling production increased from 100 to 600 μmol·m‒2·s‒1e0
- Outcome
- leaf areae0
- Direction
- largere0
- Value
- 713%e0
- Comparator
- 100e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As radiation intensity during seedling production increased from 100 to 600 μmol·m‒2·s‒1, basil seedlings were 38% taller, had a 713% larger leaf area”
t0“Basil”
Claim · model-written summary
Higher seedling radiation produced 65% thicker seedling stems.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“basil seedlings were 38% taller, had a 713% larger leaf area, and had 65% thicker stems”
t0“Basil”
Claim · model-written summary
At harvest, plants raised under higher seedling radiation were 24% taller.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at harvest, plants were 24% taller, had 56% more branches, 28% more nodes, 22% thicker stems, and weighed 80% more when fresh and dry”
t0“Basil”
Claim · model-written summary
At harvest, plants raised under higher seedling radiation had 56% more branches.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at harvest, plants were 24% taller, had 56% more branches, 28% more nodes, 22% thicker stems, and weighed 80% more when fresh and dry”
t0“Basil”
Claim · model-written summary
At harvest, plants raised under higher seedling radiation had 28% more nodes.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at harvest, plants were 24% taller, had 56% more branches, 28% more nodes, 22% thicker stems, and weighed 80% more when fresh and dry”
t0“Basil”
Claim · model-written summary
At harvest, plants raised under higher seedling radiation had 22% thicker stems.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at harvest, plants were 24% taller, had 56% more branches, 28% more nodes, 22% thicker stems, and weighed 80% more when fresh and dry”
t0“Basil”
Claim · model-written summary
At harvest, plants raised under higher seedling radiation weighed 80% more fresh and dry.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at harvest, plants were 24% taller, had 56% more branches, 28% more nodes, 22% thicker stems, and weighed 80% more when fresh and dry”
t0“Basil”
Claim · model-written summary
Basil grown under 600 μmol·m‒2·s‒1 as seedlings had greater harvest eugenol concentration than at lower intensities.
- Taxon
- BasilOcimum basilicumt0
- Treatment
- PPFD of 600 μmol·m‒2·s‒1 as seedlingse0
- Outcome
- eugenol concentratione0
- Direction
- greatere0
- Comparator
- lower intensitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“eugenol concentration was greater in plants grown under a PPFD of 600 μmol·m‒2·s‒1 as seedlings compared to lower intensities”
t0“Basil”
The same questions in other papers
light · molecular: metabolites · Ocimum basilicum (basil)Positive and negative results
19 papers in the same direction as this paper · 5 in the opposite direction
- positive
- no effect
- no effect
21 papers more in this group
See all 25 papers →radiation · growth · Ocimum basilicum (basil)Results agree
2 papers in the same direction as this paper
- positive
- 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.