Abstract
The growth and morphogenesis of leaf lettuce in response to gradual changes in light intensity over time were investigated. Seedlings of leaf lettuce (Lactuca sativa L. var. crispa “Greenwave”) were grown in a blue to red light-emitting diode (LED) ratio of 0.33 and daily light integral (DLI) of 8.7 mol m-2 d-1. The first experiment was conducted with nine treatments, in which light intensity varied every 15 min with its peak during the day and a consistent dark period of 8 h. In the second experiment, three dark period lengths and three irradiation changes were combined based on the irradiations that produced different plant growth responses in the first experiment. Based on the results of the two experiments, most of the irradiation methods with the same DLI and dark period resulted in similar leaf lettuce growth in terms of plant weight and shape. However, plant weight was reduced when a high level of light intensity was employed for a long duration during the light period. Shorter dark periods can accelerate the growth of leaf lettuce. Consequently, the results from this study propose a new irradiation method with a non-constant light intensity in relation to time.
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Claims 4
Claim · model-written summary
Most irradiation methods with equal DLI and dark period gave similar weight and shape.
Verbatim
e0“most of the irradiation methods with the same DLI and dark period resulted in similar leaf lettuce growth in terms of plant weight and shape”
Claim · model-written summary
Prolonged high light reduced plant weight.
- Taxon
- leaf Lettucet0
- Treatment
- a high level of light intensitye0
- Outcome
- plant weighte0
- Direction
- reducede0
- Qualifier
- for a long duration during the light periode0
Not reportedComparator
Verbatim
e0“plant weight was reduced when a high level of light intensity was employed for a long duration during the light period”
t0“leaf Lettuce”
Claim · model-written summary
Shorter dark periods accelerated leaf lettuce growth.
- Taxon
- leaf lettucee0
- Treatment
- Shorter dark periodse0
- Outcome
- growth of leaf lettucee0
- Direction
- acceleratee0
Not reportedComparator
Verbatim
e0“Shorter dark periods can accelerate the growth of leaf lettuce”
Claim · model-written summary
The authors propose an irradiation method with light intensity varying over time.
Verbatim
e0“the results from this study propose a new irradiation method with a non-constant light intensity in relation to time”
t0“leaf Lettuce”
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