scholarly journals shl, a New Set of Arabidopsis Mutants with Exaggerated Developmental Responses to Available Red, Far-Red, and Blue Light

2001 ◽  
Vol 127 (1) ◽  
pp. 295-304 ◽  
Author(s):  
Alan E. Pepper ◽  
Mi-seon Seong-Kim ◽  
Stephanie M. Hebst ◽  
Kathryn N. Ivey ◽  
Su-Jin Kwak ◽  
...  
Keyword(s):  
Blue Light ◽  
Arabidopsis Mutants ◽  
Developmental Responses

scholarly journals Mechanisms of the phototropic pathway

2018 ◽  
Author(s):  
◽  
Johanna Lynn Morrow
Keyword(s):  
Blue Light ◽  
Leaf Movement ◽  
Allelic Series ◽  
Differential Growth ◽  
Ubiquitin Ligase Complex ◽  
Developmental Responses ◽  
Sessile Organisms ◽  
High Intensity Light ◽  
Bending Response

Plants are sessile organisms and therefore are limited in their ability to gather resources. Therefore, they have evolved several mechanisms that aid them in their quest to gather light, water and nutrients. One such mechanism is phototropism, a plants ability to bend towards or away from a light source. This mechanism is mediated by the blue light photoreceptor phototropin (phot). Arabidopsis thaliana contains two phototropins, phot1 which is the primary photoreceptor under low intensity light and phot2, which acts redundantly with phot1 under high intensity light. The perception of blue light by the phototropins (phot1 and phot2) initiates signaling events that lead to a lateral redistribution of the plant hormone auxin; which ultimately results in differential growth and the bending response. In addition to phototropism, these proteins mediate several other growth and developmental responses such as leaf movement, chloroplast movement, and stomatal opening. A second protein which is critical to the phototropic response and interacts with phot1 is NONPHOTOTROPIC HYPOCOTYL3 (NPH3). In addition to phototropism, NPH3 has a role in phot1-mediated leaf movement. NPH3 has been shown to act as a substrate adapter in an E3 ubiquitin ligase complex with the protein CULLIN3 (CUL3). This CRL3NPH3 complex is responsible for ubiquitinating the phot1 photoreceptor in a blue light fashion. This ubiquitination has been shown to be necessary for the bending response, but it's role in receptor ubiquitination is still not fully understood. To better understand this component of phot1-mediated phototropism, we characterized an allelic series of NPH3 mutants to further understand the role of this substrate adapter in this mechanism. Additionally, we characterized several mutant plant lines containing a mutant phot1 protein in which critical ubiquitination sites were mutated in an effort to render the protein unable to be ubiquitinated to further understand phot1 ubiquitination.

scholarly journals Growth Responses of Tomato Seedlings to Different Spectra of Supplemental Lighting

HortScience ◽  
2015 ◽  
Vol 50 (1) ◽  
pp. 112-118 ◽  
Author(s):  
Celina Gómez ◽  
Cary A. Mitchell
Keyword(s):  
High Pressure ◽  
Blue Light ◽  
Light Quality ◽  
Dry Weight ◽  
Growth Responses ◽  
Light Emitting ◽  
Tomato Seedlings ◽  
Shoot Dry Weight ◽  
Supplemental Lighting ◽  
Developmental Responses

Seedlings of six tomato (Solanum lycopersicum) cultivars (‘Maxifort’, ‘Komeett’, ‘Success’, ‘Felicity’, ‘Sheva Sheva’, and ‘Liberty’) were grown monthly for 2-week treatment periods to determine photomorphogenic and developmental responses to different light-quality treatments from supplemental lighting (SL) across changing solar daily light integrals (DLIs). Seedlings were grown in a glass-glazed greenhouse at a midnorth latitude (lat. 40° N, long. 86° W) under one of five lighting treatments: natural solar light only (control), natural + SL from a 100-W high-pressure sodium (HPS) lamp, or natural + SL from arrays of red and blue light-emitting diodes (LEDs) using 80% red + 20% blue, 95% red + 5% blue, or 100% red. Varying solar DLI occurred naturally for all treatments, whereas constant DLI of 5.1 mol·m−2·d−1 was provided for all SL treatments. Supplemental lighting increased hypocotyl diameter, epicotyl length, shoot dry weight, leaf number, and leaf expansion relative to the control, whereas hypocotyl elongation decreased when SL was applied. For all cultivars tested, the combination of red and blue in SL typically increased growth of tomato seedlings. These results indicate that blue light in SL has potential to increase overall seedling growth compared with blue-deficient LED SL treatments in overcast, variable-DLI climates.

The effects of blue-light filtration on sleep and work outcomes.

2020 ◽  
Author(s):  
Cristiano L. Guarana ◽  
Christopher M. Barnes ◽  
Wei Jee Ong
Keyword(s):  
Blue Light ◽  
Work Outcomes

Nighttime Blue Light Exposure and Breast Cancer

2021 ◽  
pp. 30-33
Author(s):  
David Jaynes ◽  
Paul Switzer
Keyword(s):  
Breast Cancer ◽  
Risk Factor ◽  
Blue Light ◽  
Shift Work ◽  
Light Exposure ◽  
Night Shift ◽  
Background Information ◽  
Common Disease ◽  
Essential Information ◽  
Night Shift Work

The purpose of this article is to provide background information and the current understanding of a less familiar cause of female breast cancer; exposure to ultraviolet light at night. Breast cancer is a common disease that causes significant morbidity and mortality in women. There are several risk factors for breast cancer, most of which are genetic and environmental in nature. An often-overlooked risk factor is exposure to blue light during night shift work, which decreases melatonin production. One of the many cancer-preventing properties of melatonin is to limit estrogen production. Increased lifetime exposure to estrogen is a well-known cause of breast cancer. Awareness of nighttime blue light exposure as a breast cancer risk factor by women doing night shift work and those exposed to nighttime light via smartphones and laptops, is essential information to know so that protective measures can be taken.

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