Conspicuity of flashing and steady light signals: I. Variation of contrast. (Project No. 21-24-014, Report No. 2).

1951 ◽  
Author(s):  
Siegfried. J. Gerathewohl
Keyword(s):  
Light Signals

scholarly journals Light regulates stomatal development by modulating paracrine signaling from inner tissues

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Shenqi Wang ◽  
Zimin Zhou ◽  
Rini Rahiman ◽  
Grace Sheen Yee Lee ◽  
Yuan Kai Yeo ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Gas Exchange ◽  
Cell Lineage ◽  
Developmental Outcomes ◽  
External Factors ◽  
Light Signaling ◽  
Stomatal Development ◽  
Paracrine Signaling ◽  
Mesophyll Cells ◽  
Light Signals

AbstractDevelopmental outcomes are shaped by the interplay between intrinsic and external factors. The production of stomata—essential pores for gas exchange in plants—is extremely plastic and offers an excellent system to study this interplay at the cell lineage level. For plants, light is a key external cue, and it promotes stomatal development and the accumulation of the master stomatal regulator SPEECHLESS (SPCH). However, how light signals are relayed to influence SPCH remains unknown. Here, we show that the light-regulated transcription factor ELONGATED HYPOCOTYL 5 (HY5), a critical regulator for photomorphogenic growth, is present in inner mesophyll cells and directly binds and activates STOMAGEN. STOMAGEN, the mesophyll-derived secreted peptide, in turn stabilizes SPCH in the epidermis, leading to enhanced stomatal production. Our work identifies a molecular link between light signaling and stomatal development that spans two tissue layers and highlights how an environmental signaling factor may coordinate growth across tissue types.

scholarly journals Neurospora crassa Light Signal Transduction Is Affected by ROS

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Tatiana A. Belozerskaya ◽  
Natalia N. Gessler ◽  
Elena P. Isakova ◽  
Yulia I. Deryabina
Keyword(s):  
Neurospora Crassa ◽  
Zinc Fingers ◽  
White Collar ◽  
Photochemical Activity ◽  
Light Signal ◽  
Pas Domain ◽  
Light Responses ◽  
Expression Of Genes ◽  
Heterodimeric Complex ◽  
Light Signals

In the ascomycete fungus Neurospora crassa blue-violet light controls the expression of genes responsible for differentiation of reproductive structures, synthesis of secondary metabolites, and the circadian oscillator activity. A major photoreceptor in Neurospora cells is WCC, a heterodimeric complex formed by the PAS-domain-containing polypeptides WC-1 and WC-2, the products of genes white collar-1 and white collar-2. The photosignal transduction is started by photochemical activity of an excited FAD molecule noncovalently bound by the LOV domain (a specialized variant of the PAS domain). The presence of zinc fingers (the GATA-recognizing sequences) in both WC-1 and WC-2 proteins suggests that they might function as transcription factors. However, a critical analysis of the phototransduction mechanism considers the existence of residual light responses upon absence of WCC or its homologs in fungi. The data presented point at endogenous ROS generated by a photon stimulus as an alternative input to pass on light signals to downstream targets.

Traffic Control by Light Signals

BMJ ◽  
1934 ◽  
Vol 2 (3837) ◽  
pp. 141-141
Author(s):  
W. W. K. Brown
Keyword(s):  
Traffic Control ◽  
Light Signals

Slow-Light Signals Travel at Sonic Speed Across Micro-Laser Arrays

2007 ◽  
Vol 18 (12) ◽  
pp. 40
Author(s):  
Spilios Riyopoulos ◽  
Martijn de Sterke ◽  
Ian Littler ◽  
Benjamin J. Eggleton
Keyword(s):  
Slow Light ◽  
Laser Arrays ◽  
Light Signals ◽  
Sonic Speed

Use of the Image Orthicon Tube for Detecting Low Intensity Pulsed Light Signals

1969 ◽  
Vol 8 (1) ◽  
pp. 59 ◽  
Author(s):  
U. Ascoli-Bartoli ◽  
A. De Angelis ◽  
M. Nardi
Keyword(s):  
Pulsed Light ◽  
Low Intensity ◽  
Light Signals
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