scholarly journals INFLUENCE OF LIGHT SOURCE ON THE GROWTH OF ALFALFA CULTIVARS

1973 ◽  
Vol 53 (2) ◽  
pp. 291-294 ◽  
Author(s):  
D. H. HEINRICHS
Keyword(s):  
Protein Content ◽  
Light Source ◽  
Germ Plasm ◽  
Red Light ◽  
Fluorescent Light ◽  
Medicago Falcata ◽  
Definite Trend ◽  
Growth Room ◽  
Yellow Orange ◽  
Genetic Makeup

Alfalfa produced more herbage and more roots in a growth room when the fluorescent portion of an incandescent-fluorescent light source consisted of half gro-lux, high in blue-green-red light and half cool-white, high in blue-green-yellow-orange light than when it consisted of either alone. Protein content and degree of flowering were not affected by light source variations. Alfalfa cultivars, ranging in genetic makeup from Medicago falcata to M. media and M. sativa types, responded similarly to variations in light source. There was a definite trend for cultivars to produce less herbage and fewer roots as the proportion of M. falcata germ plasm in them increased. M. falcata flowered later than M. sativa in the growth room.

scholarly journals Effect of colour of light on the opening of inflorescence buds and post-harvest longevity of pot chrysanthemums (Chrysanthemum × grandiflorum (Ramat.) Kitam)

2012 ◽  
Vol 64 (3) ◽  
pp. 13-18 ◽  
Author(s):  
Marek Jerzy ◽  
Piotr Zakrzewski ◽  
Anita Schroeter-Zakrzewska
Keyword(s):  
Blue Light ◽  
Significant Influence ◽  
White Light ◽  
Red Light ◽  
Green Light ◽  
Fluorescent Light ◽  
Yellow Light ◽  
Post Harvest ◽  
Growth Room

The pot cultivar of <i>Chrysanthemum</i> × <i>grandiflorum</i> 'Leticia Time Yellow' was cultivated and stored in a growth room under fluorescent light of white, blue, green, yellow and red colour. Quantum irradiance was 30 μmol · m<sup>-2</sup> × s<sup>-1</sup>. The colour of light exerted a significant influence on the opening of closed inflorescence buds and on post-harvest longevity of pot chrysanthemums grown earlier in an unheated plastic tunnel. Under florescent lamps emitting blue light at a wavelength of 400-580 nm, inflorescence buds opened and coloured the earliest. The number of developed flower heads was the greatest under blue and white light. Flower heads developing in blue light were bigger than flower heads developing in white and green light. In red light at a wavelength of 600-700 nm, plants flowered latest and they produced the smallest flower heads. Post-harvest longevity was preserved longest in chrysanthemums kept under blue, white and green light. In red and yellow light, the flowers were overblown earliest.

scholarly journals A PHOTOELECTRIC DEVICE FOR MEASUREMENT OF LEAF AREAS

1958 ◽  
Vol 38 (4) ◽  
pp. 490-494 ◽  
Author(s):  
L. S. Donovan ◽  
A. I. Magee ◽  
W. Kalbfleisch
Keyword(s):  
Light Source ◽  
Genetic Study ◽  
Red Light ◽  
Leaf Size ◽  
Light Filter ◽  
Birdsfoot Trefoil ◽  
Fluorescent Light ◽  
Photoelectric Device ◽  
Rapid Measurement

A device for the rapid measurement of leaf areas is described. Leaves are placed between a fluorescent light source, high in the red spectrum, and a photocell covered with an F29 red light filter. The reduction in output of the cell, as measured by a galvanometer, is interpreted in terms of area. The device has been successfully used in a genetic study of leaf size in birdsfoot trefoil.

Effects of specific wavelength spectra on antioxidant stress and cell damage of the ornamental cleaner shrimp Lysmata amboinensis (De Man, 1888) (Decapoda, Caridea, Lysmatidae) exposed to changing saline environments

Crustaceana ◽  
2018 ◽  
Vol 91 (10) ◽  
pp. 1231-1245 ◽  
Author(s):  
Jong Ryeol Choe ◽  
Ji Yong Choi ◽  
Jin Ah Song ◽  
Cheol Young Choi
Keyword(s):  
Cell Damage ◽  
Red Light ◽  
Aquatic Organisms ◽  
Major Influence ◽  
Fluorescent Light ◽  
Saline Environments ◽  
Positive Effects ◽  
Negative Results ◽  
Antioxidant Stress ◽  
Cleaner Shrimp

Abstract A variety of environmental factors have a major influence on the survival of aquatic organisms, particularly light and salinity, changes in which lead to a range of physiological changes. In the present study, we investigated the levels of stress caused by changes in salinity in the ornamental cleaner shrimp, Lysmata amboinensis, as well as the effect of specific light wavelengths following stress to changes in salinity. We measured the activity of superoxide dismutase (SOD), catalase (CAT), and lipid peroxidation (LPO) in the tissues (gill, hepatopancreas, and muscle) for three days after irradiating shrimp with specific wavelengths of light [red (630 nm), green (520 nm), and blue (455 nm)] at two intensities (0.5 and 1.0 W/m2) following exposure to different saline environments [25 practical salinity units (psu), 30 psu, 35 psu (normal seawater), and 40 psu]. DNA damage was measured using comet assays. Although all of the experimental groups exhibited negative results to changes in salinity, the green and red light groups exhibited positive effects when compared to the other wavelengths and fluorescent light. The effect of wavelength was not influenced by the intensity. In conclusion, the light of green and red wavelengths effectively reduces antioxidant stress and cell damage in cleaner shrimp.

scholarly journals The Effects of Day Length and Light Intensity on Tile Growth of Barley

1969 ◽  
Vol 22 (1) ◽  
pp. 53 ◽  
Author(s):  
D Aspinall
Keyword(s):  
Light Intensity ◽  
Linear Relationship ◽  
Light Source ◽  
Blue Light ◽  
Floral Development ◽  
Red Light ◽  
Day Length

The acceleration of flowering in barley due to the inclusion of incandescent illumination in the light source has been shown to be due to the far�red content of the light. A linear relationship between floral development and intensity of far�red light in a 16�hr photoperiod has been established with the cultivar CI5611. Barley appears to be relatively unresponsive to blue light, however.

Tuning characteristics of fluorescent light source by dye-doped liquid crystal filled hollow fiber

2017 ◽  
Vol 66 (15) ◽  
pp. 154205
Author(s):  
L Yue-Lan ◽  
Yin Xiang-Bao ◽  
Yang Yue ◽  
Liu Yong-Jun ◽  
Yuan Li-Bo
Keyword(s):  
Liquid Crystal ◽  
Light Source ◽  
Hollow Fiber ◽  
Fluorescent Light
Sign in / Sign up

Export Citation Format

Share Document