Abstract
The response of bermudagrass clones (Cynodon spp.) to reduced light intensity was determined in a greenhouse experiment. Thirty-two phenotypically diverse bermudagrass clones from broad geographic origins were subjected to two light treatments. The high-light treatment consisted of sunlight supplemented with fluorescent and incandescent light banks (160 µmol·s–1·m–2). The low-light treatment was a 90% reduction of the high-light treatment (16 µmol·s–1·m–2). Visual color, leaf length, stem internode length, stem elongation, chlorophyll concentration, and dry weight were measured. Bermudagrass clones responded to reduced light by exhibiting shorter leaves, shorter stem internodes, reduced green color, lower chlorophyll concentration and decreased dry weights. ‘Boise’, ‘No Mow’, ‘R9-P1’, ‘NM2-13’, and ‘NM3’ have been identified as being moderately insensitive to reduced light intensity, and data suggest enough variability exists to select for shade tolerance in bermudagrass.
Schefflera arboricola is a member of the family Araliaceae and one of the most popular foliage plants used to landscape interiors. Generally, low light intensities, typical for indoors, increase leaf drop and reduce leaf quality ( Conover and
between ‘Shangshu 19’ buds under the light condition of SL-1 and SL-2. Therefore, we can determine that the higher photoperiod and light intensity reduce the soluble sugar content of sweetpotato buds. The vitamin C content of sweetpotato sprouts grown
July, and for the L100 and L20 treatments in August. Lower light intensities reduced stem diameter in July. Stem diameter in the L75, L50, and L20 treatments decreased by 20.54%, 28.86%, and 42.69% ( P < 0.05), respectively, compared with the control
the light intensity by adjusting or reducing the chlorophyll concentration. Chloroplast responded to light intensity by changing chlorophyll a/b and adjusting to the ETR. As shown in Figure 2 , an increase in light intensity from L 10 to L 60 was
·m −2 ·d −1 , resulting in a daily average photosynthetic photon flux density ( PPFD ) of 58 to 174 μmol·m −2 ·s −1 ( Faust and Logan, 2018 ). The available light level in greenhouses could be further reduced by 30% to 60% due to the transmission losses
black plastic shade screen and dimmers (TT-300-NLH; Lutron Electronics Co., Coopersburg, PA) were used to reduce the light intensity as needed for incandescent lamps. For the FR light dose–response experiment, an LED panel (ISL series; CCS Inc., Kyoto
fluorescence. By measuring the fluorescence emitted by chlorophyll a molecules before and during short exposure to a beam of light with sufficient intensity to saturate the PSII reaction centers completely (a “saturating pulse”), Φ PSII can be quantified
explored the optimization of LED lighting spectral quality for microgreen production, the optimal “light recipe” seems to vary with lighting intensity, growth stage, and plant species. The objective of this study was to investigate the plant responses to 1
arrays for plant growth and development, especially in sole-source lighting applications. But, how much blue? Mid-day solar light is about one-third broadband blue ( Gómez and Mitchell, 2015 ) and may be at an intensity during certain seasons that early