Light quality of continuous illuminating at night to induce floral initiation of Fragaria chiloensis L. CHI-24-1

2006 ◽  
Vol 109 (4) ◽  
pp. 309-314 ◽  
Author(s):  
Tomohiro Yanagi ◽  
Takanori Yachi ◽  
Nobuaki Okuda ◽  
Kensyo Okamoto
Keyword(s):  
Light Quality ◽  
Floral Initiation ◽  
Fragaria Chiloensis

Antagonistic actions of Arabidopsis cryptochromes and phytochrome B in the regulation of floral induction

Development ◽  
1999 ◽  
Vol 126 (10) ◽  
pp. 2073-2082 ◽  
Author(s):  
T.C. Mockler ◽  
H. Guo ◽  
H. Yang ◽  
H. Duong ◽  
C. Lin
Keyword(s):  
Flowering Time ◽  
Blue Light ◽  
Molecular Mechanisms ◽  
Light Quality ◽  
Floral Induction ◽  
Red Light ◽  
Floral Initiation ◽  
Sensitive Phase ◽  
Light Inhibition

The Arabidopsis photoreceptors cry1, cry2 and phyB are known to play roles in the regulation of flowering time, for which the molecular mechanisms remain unclear. We have previously hypothesized that phyB mediates a red-light inhibition of floral initiation and cry2 mediates a blue-light inhibition of the phyB function. Studies of the cry2/phyB double mutant provide direct evidence in support of this hypothesis. The function of cryptochromes in floral induction was further investigated using the cry2/cry1 double mutants. The cry2/cry1 double mutants showed delayed flowering in monochromatic blue light, whereas neither monogenic cry1 nor cry2 mutant exhibited late flowering in blue light. This result suggests that, in addition to the phyB-dependent function, cry2 also acts redundantly with cry1 to promote floral initiation in a phyB-independent manner. To understand how photoreceptors regulate the transition from vegetative growth to reproductive development, we examined the effect of sequential illumination by blue light and red light on the flowering time of plants. We found that there was a light-quality-sensitive phase of plant development, during which the quality of light exerts a profound influence on flowering time. After this developmental stage, which is between approximately day-1 to day-7 post germination, plants are committed to floral initiation and the quality of light has little effect on the flowering time. Mutations in either the PHYB gene or both the CRY1 and CRY2 genes resulted in the loss of the light-quality-sensitive phase manifested during floral development. The commitment time of floral transition, defined by a plant's sensitivity to light quality, coincides with the commitment time of inflorescence development revealed previously by a plant's sensitivity to light quantity - the photoperiod. Therefore, the developmental mechanism resulting in the commitment to flowering appears to be the direct target of the antagonistic actions of the photoreceptors.

scholarly journals Light Quality of Artificial Light Sources for Agriculture

2013 ◽  
Vol 25 (3) ◽  
pp. 142-145
Author(s):  
Hiroshi HAMAMOTO ◽  
Keisuke YAMAZAKI
Keyword(s):  
Light Quality ◽  
Artificial Light ◽  
Light Sources

Effects of LED Monochromatic Light Quality of Different Colors on Fucoxanthin Content and Expression Levels of Related Genes in Phaeodactylum Tricornutum

2019 ◽  
Vol 39 (9) ◽  
pp. 0917001 ◽  
Author(s):  
徐润洁 Runjie Xu ◽  
龚一富 Yifu Gong ◽  
陈文婷 Wenting Cheng ◽  
李申睿 Shenrui Li ◽  
陈若莹 Ruoying Chen ◽  
...  
Keyword(s):  
Phaeodactylum Tricornutum ◽  
Light Quality ◽  
Monochromatic Light ◽  
Expression Levels

Crash Safety and Light Quality of Automobile Bumper Made of Tube Filled with Foam Aluminum

2012 ◽  
Vol 619 ◽  
pp. 168-171
Author(s):  
Ying Hua Yu ◽  
Hai Nan Tan ◽  
Kun Yang ◽  
Ping Ping Wang
Keyword(s):  
Finite Element ◽  
Energy Conservation ◽  
Light Quality ◽  
Steel Tube ◽  
Vehicle Safety ◽  
Metal Tube ◽  
Foam Aluminum ◽  
Crash Safety ◽  
Collision Condition

Taking hollow steel tube bumper as the prototype, the structure of steel bumper filled with foam aluminum was simplified preliminary. Then the finite element deformations of two bumper structures were analyzed in the same collision condition. And the quality of two bumper structures were calculated and compared. The results show that automobile bumper made of metal tube filled with foam aluminum can improve the cash safety and reduce the quality of the car significantly. This research provides a new way to improve vehicle safety, energy conservation and environmental protection.

scholarly journals Production and quality of strawberry cultivated under different colors of low tunnel cover

2017 ◽  
Vol 35 (3) ◽  
pp. 364-370 ◽  
Author(s):  
Juliane M Henschel ◽  
Juliano TV Resende ◽  
Patrícia C Giloni-Lima ◽  
André R Zeist ◽  
Renato B Lima Filho ◽  
...  
Keyword(s):  
Fruit Quality ◽  
Light Quality ◽  
Specific Response ◽  
Light Spectrum ◽  
Vegetative Traits ◽  
Low Tunnels ◽  
Social Importance ◽  
Physiological And Biochemical ◽  
Lower Production

ABSTRACT Strawberry is a crop of great economic and social importance. Its fruits are appreciated both for their flavor and nutraceutical potential. Some studies confirm that light quality influences plant physiology. Thus, the aim of this study was to investigate if changes in light spectrum, provided by low tunnels, can improve vegetative traits, as well as, production and fruit quality of strawberry. The authors used six tunnel covers (red, yellow, blue, green, transparent and opaque and one control, without cover), and two cultivars: a short photoperiod cultivar (Camarosa) and a neutral photoperiod cultivar (Albion). Experiment was evaluated in two seasons: production and plant development first; and then, post-harvest quality. Overall, Camarosa showed higher vegetative growth, lower production, and better fruit quality than Albion. Due to the complexity of physiological and biochemical responses, each trait evaluated showed a specific response to light changes. The red, blue, yellow and green covers did not show any significant improvement comparing with transparent and opaque covers. Thus, the authors suggest the use of the latter ones which have already been used commercially.

scholarly journals The role of far-red light (FR) in photomorphogenesis and its use in greenhouse plant production

2020 ◽  
Vol 116 (1) ◽  
pp. 93
Author(s):  
Bojka KUMP
Keyword(s):  
Growth And Development ◽  
Light Quality ◽  
Red Light ◽  
Spectral Composition ◽  
Plant Production ◽  
Recent Developments ◽  
Long Time ◽  
Supplementary Lighting ◽  
Quality Of Products

<p>Light energy is one of the most important factors regulating the growth and development of plants. In greenhouses and other controlled- environments in which the natural radiation intensities are often low, plant production relies on supplementary lighting to optimize the photosynthesis, increase production levels, and enable year-round production. For a long time, the research related to artificial lighting sources focused on the optimization of the efficiency of use for photosynthesis. The quality of light in plant production has been widely addressed only recently with the development of advanced LED technology that is energy efficient and enables the control of the spectral composition of light. Red and far-red light are sensed by the phytochromes that trigger several morphological and developmental processes that impact productivity and yield quality. Thus, to efficiently exploit all the advantages of LEDs and to develop LED arrays for specific plant applications, it is essential to understand thoroughly how light quality influences plant growth and development. This paper presents an overview of the recent developments in light quality manipulation, focusing on far-red light and the R: FR ratio, to improve yield and quality of products and to manage plant architecture and flowering in vegetable and ornamental horticulture.</p>

The role of light quality of photoperiodic lighting on photosynthesis, flowering and metabolic profiling in Ranunculus asiaticus L.

2020 ◽  
Vol 170 (2) ◽  
pp. 187-201
Author(s):  
Giuseppe C. Modarelli ◽  
Carmen Arena ◽  
Giuseppe Pesce ◽  
Emilia Dell'Aversana ◽  
Giovanna M. Fusco ◽  
...  
Keyword(s):  
Metabolic Profiling ◽  
Light Quality ◽  
Ranunculus Asiaticus ◽  
Role Of Light
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