Abstract
The effect of additional far-red (FR) irradiation produced by FR fluorescent lamps on the growth of lettuce (Lactuca sativa L. cv. Okayama) was examined. The main lighting source was 3-band fluorescent lamps. The photosynthetic photon flux density (PPFD) (400-700 nm) was kept at 200μmol⋅m-2⋅sec-1 in all treatments and each additional photon flux density (PFD) of FR (700-800 nm) irradiation in four treatments was kept at 107.1, 50.1, 25.6, and 9.3μmol⋅m-2⋅sec-1, respectively. The experiment was performed in a controlled environment at 25°C and at 70% relative humidity.According to the level of additional FR irradiation, the fresh weight, dry weight, leaf area, stem length and internode length of the lettuce was increased. Although the PPFD remained constant, additional FR irradiation was useful in accelerating plant growth. It was believed that plant photomorphogenesis was changed by FR irradiation, resulting in the increase in the internode length and leaf area and cosequently the plants were able to absorb more photons.Comparing the two methods of accelerating plant growth, adding FR irradiation and increasing the level of the PPFD, the former was more efficient than the latter as far as electrical consumption.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
Additional far-red irradiation increased lettuce fresh and dry weight and leaf area.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- additional FR irradiatione0
- Outcome
- fresh weight, dry weight, leaf areae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“According to the level of additional FR irradiation, the fresh weight, dry weight, leaf area, stem length and internode length of the lettuce was increased”
Claim · model-written summary
Additional far-red irradiation increased lettuce stem and internode length.
- Taxon
- lettuceLactuca sativae0
- Treatment
- additional FR irradiatione0
- Outcome
- stem length and internode lengthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“According to the level of additional FR irradiation, the fresh weight, dry weight, leaf area, stem length and internode length of the lettuce was increased”
Claim · model-written summary
The authors interpreted FR irradiation as changing lettuce photomorphogenesis and increasing photon absorption.
- Taxon
- lettuceLactuca sativae1
- Treatment
- FR irradiatione0
- Outcome
- absorb more photonse0
- Qualifier
- plant photomorphogenesis was changede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant photomorphogenesis was changed by FR irradiation, resulting in the increase in the internode length and leaf area and cosequently the plants were able to absorb more photons”
e1“growth of lettuce”
Claim · model-written summary
Adding FR irradiation was more electrically efficient for accelerating lettuce growth than increasing PPFD.
- Taxon
- lettuceLactuca sativae1
- Treatment
- adding FR irradiatione0
- Outcome
- more efficient than the latter as far as electrical consumptione0
- Direction
- more efficiente0
- Comparator
- increasing the level of the PPFDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Comparing the two methods of accelerating plant growth, adding FR irradiation and increasing the level of the PPFD, the former was more efficient than the latter as far as electrical consumption”
e1“growth of lettuce”
The same questions in other papers
radiation · growth · Lactuca sativa (garden lettuce)Results differ
26 papers in the same direction as this paper · 14 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- negative
- no effect
39 papers more in this group
See all 43 papers →light · pest · Lactuca sativa (garden lettuce)Positive and negative results
7 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- positive
- positive
5 papers more in this group
See all 9 papers →light · growth · Lactuca sativa (garden lettuce)Positive and negative results
242 papers in the same direction as this paper · 54 in the opposite direction · 3 reporting no difference from an alternative
- positive
- negative
- no effect
296 papers more in this group
See all 300 papers →radiation · pest · Lactuca sativa (garden lettuce)Results agree
3 papers in the same direction as this paper
- positive
- 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.