Abstract
To investigate the effects of different types of irradiation on the growth and morphological characteristics of leaf lettuce (Lactuca sativa L. var. crispa “Greenwave”), a quantitative analysis of the leaf contour using an elliptic Fourier descriptor (EFD) was carried out together with conventional measurement methods. Two experiments were conducted to test the different treatments. Experiment 1 investigated the effects of monochromatic/alternating/simultaneous red/blue irradiation, and Experiment 2 determined the effects of random variations in photosynthetic photon flux density (PPFD) compared with that of constant light. The growth and morphological characteristics in Experiment 1 were consistent with those of previous studies, where the shoot fresh weights in monochromatic and alternating irradiations were larger than those in simultaneous irradiations. EFD showed that the leaf length and petiole under monochromatic and alternating irradiation were longer and more apparent than those under simultaneous irradiation. In Experiment 2, both the conventional measurement methods and EFD could hardly detect any differences in leaf lettuce growth and morphological characteristics under constant PPFD. These results suggested that fluctuating PPFD within certain limits in a PFAL may have little effect on the leaf lettuce growth.
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Claims 4
Claim · model-written summary
Monochromatic and alternating irradiation produced greater lettuce shoot fresh weights than simultaneous irradiation.
Verbatim
e0“the shoot fresh weights in monochromatic and alternating irradiations were larger than those in simultaneous irradiations.”
e1“leaf lettuce (Lactuca sativa L. var. crispa “Greenwave”)”
Claim · model-written summary
EFD detected longer leaves and more apparent petioles under monochromatic and alternating irradiation.
Verbatim
e0“EFD showed that the leaf length and petiole under monochromatic and alternating irradiation were longer and more apparent than those under simultaneous irradiation.”
e1“leaf lettuce (Lactuca sativa L. var. crispa “Greenwave”)”
Claim · model-written summary
Conventional measurements and EFD hardly detected differences in lettuce growth or morphology under constant PPFD.
Verbatim
e0“both the conventional measurement methods and EFD could hardly detect any differences in leaf lettuce growth and morphological characteristics under constant PPFD.”
Claim · model-written summary
Fluctuating PPFD within certain limits in a PFAL may have little effect on lettuce growth.
- Taxon
- leaf lettucee0
- Treatment
- fluctuating PPFDe0
- Outcome
- leaf lettuce growthe0
- Direction
- little effecte0
- Qualifier
- within certain limits in a PFALe0
Not reportedComparator
Verbatim
e0“fluctuating PPFD within certain limits in a PFAL may have little effect on the leaf lettuce growth.”
The same questions in other papers
radiation · growth · Lactuca sativa (garden lettuce)Results differ
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- no effect
- positive
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See all 43 papers →light · growth · Lactuca sativa (garden lettuce)Positive and negative results
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See all 300 papers →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.