scholarly journals Light Acclimatization Potential of Leea coccinia and Leea rubra Grown under Low Light Flux

HortScience ◽  
1992 ◽  
Vol 27 (5) ◽  
pp. 404-406 ◽  
Author(s):  
J.M. Sarracino ◽  
R. Merritt ◽  
C.K. Chin
Keyword(s):  
Plant Species ◽  
Light Flux ◽  
Low Light ◽  
Ficus Benjamina ◽  
Respiration Rates ◽  
Foliage Plant ◽  
Lower Light

Two foliage plant species, Leea coccinia L. and Leea rubra L., exhibited lower light compensation points and faster rates of acclimatization than Ficus benjamina L. when moved from full sun to dense shade, i.e., from 15.7 to 0.26 or 0.09 mol·m·-2day-1. Light compensation points were reduced up to 75% for L. coccinia and 71% for L. rubra after 25 days under these conditions. Uptake of CO2 increased from 65% to 179% and 34% to 118% for L. coccinia and L. rubra, respectively, while respiration rates were reduced from 73% and 76% to 59% to 68%, respectively. Ficus benjamina plants died under similar conditions.

scholarly journals Morphological and Physiological Characteristics of Leea coccinia and Leea rubra in Response to Light Flux

HortScience ◽  
1992 ◽  
Vol 27 (5) ◽  
pp. 400-403 ◽  
Author(s):  
J.M. Sarracino ◽  
R. Merrit ◽  
C.K. Chin
Keyword(s):  
Chlorophyll A ◽  
Light Flux ◽  
Dry Weight ◽  
Anthocyanin Content ◽  
Total Chlorophyll ◽  
Low Light ◽  
Lighting Conditions ◽  
Interior Lighting ◽  
Chlorophyll A And B ◽  
Foliage Plant

Two foliage plant species, Leea coccinia L. and Leea rubra L., were evaluated for survival and for morphological and physiological changes in response to low light flux. Both species of Leea survived in light as low as that survived by Ficus benjamina L. Following 124 days under simulated interior lighting conditions of 5.7, 2.6, or 0.70 mol·m-2·day-1, L. coccinia, L. rubra, and F. benjamina plants grown in 92% shade had lower total fresh/dry weight, smaller leaf area, and thinner leaves than plants grown in full sun. After 124 days, plants of all three species in 92% shade were shorter, narrower, and had fewer growing points than plants in full sun. After 124 days, plants of L. coccinia grown in 92% shade contained more total chlorophyll, and more chlorophyll a and b, and they had a lower chlorophyll a: b ratio than plants from full sun. Anthocyanin content in L. rubra plants grown in 92% shade was lower than that of plants grown in full sun. Plants of F. benjamina grown in 92% shade contained more total chlorophyll and more chlorophyll a and b than plants grown in full sun.

scholarly journals Effect of light intensity and growth substratum on plant development and production of secondary metabolites in Cordia curassavica (Jacq.) Roem. & Schult

2010 ◽  
Vol 34 (3) ◽  
pp. 417-423 ◽  
Author(s):  
Maria Terezinha Silveira Paulilo ◽  
Flávia Simão Lapa ◽  
Miriam de Barcellos Falkenberg
Keyword(s):  
Light Intensity ◽  
Root Biomass ◽  
Relative Income ◽  
High Light Intensity ◽  
High Light ◽  
Alcoholic Extract ◽  
Low Light ◽  
Fertilized Soil ◽  
Lower Light ◽  
Effect Of Light

Cordia curassavica (Jacq.) Roem. & Schult. (Boraginaceae), also referred to as Cordia verbenacea DC, has been traditionally used for medicinal purposes. This study was driven to verify the behavior of the species in similar conditions to its natural environment, such as high light intensity and sandbank soil, and in conditions of low light intensity and fertilized substratum (dystroferric red nitosoil plus earthworm humus). The growth of the plant, the income of leaf crude extracts and, in the alcoholic extract, the number of substances found in thin layer cromatography and the toxicity of the substratum was observed. The results indicated that the growth of the root biomass, stem and leaves in discharge or lower light intensity was similar, but smaller in sandbank soil than in fertilized soil. The relative income of extracts in ether of petroleum and alcohol was larger in high light intensity and fertilized substratum. The light intensity and the substratum type didn't affect the number of substances detected in the alcoholic extract or the toxicity of this extract. Stains corresponding to the rosmarinic acid were only evidenced in some samples of the alcoholic extract, not allowing the verification of the effect of the treatments about its production.

Interspecific variation in the response of growth, crown morphology, and survivorship to light of six tree species in the conifer belt of the Bhutan Himalayas

2004 ◽  
Vol 34 (5) ◽  
pp. 1093-1107 ◽  
Author(s):  
Georg Gratzer ◽  
Andras Darabant ◽  
Purna B Chhetri ◽  
Prem Bahadur Rai ◽  
Otto Eckmüllner
Keyword(s):  
Tree Species ◽  
Radial Growth ◽  
Interspecific Variation ◽  
Low Light ◽  
Continuous Growth ◽  
Light Levels ◽  
Shade Tolerant Species ◽  
Lower Light ◽  
Crown Morphology ◽  
Changing Light

The responses of radial and height growth, plant architecture, and the probability of mortality of saplings to varying light levels were quantified for six tree species in temperate conifer forests of the Bhutan Himalayas. Increases in growth with increasing light were comparable with those of high latitude tree species but lower than those of tropical tree species and temperate species in North America. The shade-tolerant species Tsuga dumosa (D. Don.) Eichler showed the strongest increase in radial growth at low light and reached asymptotic growth early. It had the deepest crowns in low light and a low decrease of leader growth with decreasing light. It represents a continuous growth type, which invests in height rather than lateral growth under low light conditions. Betula utilis D. Don. showed greater increases in radial growth and a higher mortality at low light than the more shade-tolerant Abies densa Griff., in keeping with the trade-off between survivorship and growth at low light. Picea spinulosa Griff, Larix griffithiana Carriére, and Pinus wallichiana A.B. Jackson showed small increases in growth at low light levels. The latter two species showed no capacity to adapt their morphology in response to changing light levels, which resulted in higher probabilities of mortality at lower light levels. Differences in the probability of mortality at different light levels were more pronounced than differences in the light-growth response, underlining the importance of survivorship at low light for successional dynamics.

Effect of SO2 on stomatal aperture and sulfur uptake of woody angiosperm seedlings

1979 ◽  
Vol 9 (1) ◽  
pp. 57-62 ◽  
Author(s):  
T. L. Noland ◽  
T. T. Kozlowski
Keyword(s):  
Light Intensity ◽  
Plant Species ◽  
Stomatal Closure ◽  
Environmental Stresses ◽  
Stomatal Aperture ◽  
Low Light ◽  
Low Light Intensity

Effects of SO2 pollution on stomatal aperture and sulfur uptake varied with SO2 dosage and plant species. Fumigation of Ulmusamericana L. seedlings with 1 ppm SO2 for 8 h inhibited stomatal closure and fumigation with 2 ppm SO2 for 12 h induced stomatal closure. Sulfur uptake of fumigated Ulmusamericana seedlings depended on stomatal aperture and was much higher in the light than in the dark. Fumigation of water-stressed Ginkgobiloba L. seedlings with 2 ppm SO2 for 6.5 h tended to prevent stomatal closure. However, the effects of SO2 on stomatal aperture were modulated and often overridden by environmental stresses such as low light intensity and drought.

Measurement of low light flux by photon counting

1968 ◽  
Vol 1 (11) ◽  
pp. 1459-1468 ◽  
Author(s):  
C J Oliver ◽  
E R Pike
Keyword(s):  
Photon Counting ◽  
Light Flux ◽  
Low Light

scholarly journals LANDSCAPE USE AND AESTHETICAL VALUE OF SURVEYED WOODY ORNAMENTAL PLANTS IN CAIRO FESTIVAL CITY - CAIRO - EGYPT IN LANDSCAPE GARDENING

2021 ◽  
Vol 21 (no 1) ◽  
Author(s):  
Abdelnaby . ◽  
A. S. I. ◽  
A. A. Mewead ◽  
A. S. H. Gendy ◽  
M. A. I. Abdelkader
Keyword(s):  
Plant Species ◽  
Woody Plant ◽  
Ornamental Plants ◽  
Cupressus Sempervirens ◽  
Ficus Benjamina ◽  
Woody Plant Species ◽  
Schinus Molle ◽  
Woody Ornamental ◽  
The Right ◽  
Landscape Gardening

Sustainability and successful utilize of plants in gardens and landscape will be achieved by using proper plant in the right place. Hence landscape uses and aesthetical values of plants must be determined. Therefore, the present study were conducted to survey woody ornamental plants located in Cairo Festival City gardens, CairoGovernorate, Egypt through 2018 and 2019 as well as to determine their uses and values in terms of landscaping. Form beauty, ornamental foliage, ornamental fruit, ornamental flowers, and fragrance were took as aesthetical values parameters while landscape uses were recorded by the existing uses and potential uses of each plant. As a result of the study, totally 83 woody plant species belong to 33 families were recorded and they follow trees (40%), palms (12%), shrubs (41%), and vines (7%). Moreover, it has been found that Schinus molle, Plumeria alba, and Duranta erecta are attractive for four parameters of aesthetical value and the most of species are attractive for their ornamental foliage (32%). Also, Tecoma capensis, Cupressus sempervirens, Ficus benjamina, Plumbago auriculataare detected to be in nine different landscape uses and the most of species are recommended to be used as a specimen (68 species).

scholarly journals 192 Controlling Early Growth of Marigold and Tomato Plugs

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 475C-475
Author(s):  
C.C. Pasian ◽  
M.A. Bennett
Keyword(s):  
Plant Species ◽  
Growth Regulators ◽  
Growth Regulator ◽  
Early Growth ◽  
Ornamental Plant ◽  
Seedling Height ◽  
Low Light ◽  
Tomato Seedling ◽  
Preliminary Results ◽  
Growing Medium

Some transplanted crops, like tomato and marigolds, tend to stretch very early after germination, especially if grown in low light environments. By the time growers apply growth regulators (PGRs), the stretching of the hypocotyl has already occurred and sprays are ineffective. Seeds of marigold `Bonanza Gold' and tomato `Sun 6108' were soaked for 6, 16, and 24 h in paclobutrazol solutions of 0, 500, and 1000 ppm. After imbibition, seeds were dried for 24 h before sowing in plugs. Sixteen, 26, and 36 days after sowing, seedling height and percent emergence were measured. Increasing concentrations of PGR and time of imbibition produced shorter seedlings. Tomato seedling heights measured 36 days after sowing were 1.9, 1.5, and 1.7 cm when imbibed in water for 6, 16, and 24 h, respectively. When PGR was used at 500 ppm, seedling heights were: 1.4, 1.2, and 1.2 cm, respectively. Similar reductions were observed for marigolds. It was hypothesized that some seeds have coats that are impermeable to PGRs. These impermeable coats might serve as PGR carriers, delivering the chemical into the growing medium of the plug cell. When the root emerges from the seed, it absorbs the growth regulator. These preliminary results indicate that this method of PGR application may be feasible and could benefit plug growers of marigold and other ornamental plant species prone to early stretching (e.g., cosmos).

The effects of temperature and light energy on dry weight and leaf area changes in seedling plants of Lolium perenne L

1971 ◽  
Vol 22 (2) ◽  
pp. 177 ◽  
Author(s):  
JH Silsbury
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Lolium Perenne ◽  
Light Flux ◽  
Dry Weight ◽  
Light Energy ◽  
Net Assimilation Rate ◽  
Assimilation Rate ◽  
Low Light ◽  
Net Assimilation

Nine identical seedling populations of Lolium perenne cv. Grasslands Ruanui were grown at different times in a controlled environment cabinet under 22, 38, and 117 watts m-2Visible radiation (16 hr day length) and at 10, 20, and 30�C for 32 days. The proportion of the total dry matter present as roots and that of the shoot dry weight present as leaf laminae were only slightly affected by the environment. Shoot growth was dominated by leaf growth; responses to the environment of the average relative growth rate (El,) and the average leaf area growth rate RA) were similar. RW and RA were maximal at 20�C at each light flux density and increased toward a maximum with increased radiation at each temperature. Maximum RW for seedling plants of L. perenne was about 25% per day. The net assimilation rate increased approximately linearly with increase in light flux and was scarcely affected by temperature. The leaf area ratio was greatly affected by changes in light energy, mainly owing to change in the specific leaf area. The rate of leaf appearance was accelerated by a temperature increase from 10 to 20�C. Total tiller number was maximal at 20�C and increased with light flux. When related to leaf number, tillering was reduced only by high temperature at low light energy. The relative changes in net assimilation rate induced by variation in light flux at 20�C were the same as those in the net photosynthesis of a single leaf lamina. The growth of seedling ryegrass plants in the field in winter is considered to be strongly dependent on temperature and much less restricted by low light energy.

Optical Utilization Factor for Architectural Lighting

2019 ◽  
pp. 49-57
Author(s):  
Catalin Daniel Galatanu ◽  
Muhammad Ashraf ◽  
Dorin Dumitru Lucache ◽  
Dorin Beu ◽  
Calin Ciugudeanu
Keyword(s):  
Pollution Assessment ◽  
Small Scale ◽  
Light Pollution ◽  
Low Light ◽  
Utilization Factor ◽  
Lower Light ◽  
Architectural Lighting

Optical utilization factor (OUF) is applied to architectural lighting, searching to obtain low light pollution. It is demonstrated that OUF could not be used for the assessment of light pollution, because the inter-reflections could not be neglected. DIALUX simulations and MATLAB original functions are used. Onsite measurements for illuminance and luminance are performed. It is demonstrated that OUF could be greater than one for the facade. For the small scale inter-reflections, a luminance gain is demonstrated. Due to this, the floodlighting could be reduced. The understanding about the light pollution assessment is changed, which is a major achievement. It means that a greater OUF don’t represent a lower light pollution, and also a facade could be more “visible” on lower level of floodlighting.

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