Light-grown plants of transgenic tobacco expressing an introduced oat phytochrome A gene under the control of a constitutive viral promoter exhibit persistent growth inhibition by far-red light

Planta ◽  
1992 ◽  
Vol 188 (2) ◽  
pp. 173-181 ◽  
Author(s):  
Alex McCormac ◽  
Garry Whitelam ◽  
Harry Smith
Keyword(s):  
Growth Inhibition ◽  
Transgenic Tobacco ◽  
Red Light ◽  
Phytochrome A ◽  
Viral Promoter

Far-Red Light Blocks Greening of Arabidopsis Seedlings via a Phytochrome A: Mediated Change in Plastid Development

1996 ◽  
Vol 8 (4) ◽  
pp. 601 ◽  
Author(s):  
Simon A. Barnes ◽  
Naoko K. Nishizawa ◽  
Ronaldo B. Quaggio ◽  
Garry C. Whitelam ◽  
Nam-Hai Chua
Keyword(s):  
Red Light ◽  
Phytochrome A ◽  
Plastid Development

scholarly journals Ethylene Is Not Involved in the Blue Light-Induced Growth Inhibition of Red Light-Grown Peas

1992 ◽  
Vol 100 (1) ◽  
pp. 95-99 ◽  
Author(s):  
Marta J. Laskowski ◽  
Espanta Seradge ◽  
James R. Shinkle ◽  
Winslow R. Briggs
Keyword(s):  
Growth Inhibition ◽  
Blue Light ◽  
Red Light

Dynamics of the processes leading to the acquisition of sensitivity to very low fluence of photons inDatura feroxseeds

2013 ◽  
Vol 23 (4) ◽  
pp. 233-239
Author(s):  
Gabriela Alejandra Auge ◽  
Lucila de Miguel
Keyword(s):  
Physiological State ◽  
Red Light ◽  
Light Sensitivity ◽  
Growth Potential ◽  
Soil Tillage ◽  
Phytochrome A ◽  
Light Stimulation ◽  
Endosperm Weakening ◽  
Signalling Network ◽  
Stimulation Of

AbstractSoil tillage operations stimulate germination of buried seeds in cultivated lands, allowing them to perceive light as a germination-promoting factor. The time of burial and the effect of changing environmental factors affect the physiological state of the seeds, which may lead to an extreme light-sensitivity and very low fluence response (VLFR) through phytochrome A. This paper describes the influence of the progressive process of dormancy breakage, which is accompanied by the acquisition of extreme light-sensitivity, on processes associated with endosperm weakening and embryo growth potential in the VLFR-mediated promotion ofDatura feroxseed germination. Our results show that endosperm weakening is mainly limited by β-mannosidase enzyme activity after far-red light stimulation, which is highly dependent on the dormancy level of the seeds. In addition, stimulation of the embryo growth potential by far-red irradiation did not require an extreme light-sensitivity to very low fluence of photons to reach its maximum response, and it was not completely correlated with expansin gene expression in the embryo. Our work indicates that responses of endosperm weakening and embryo growth potential to far-red irradiation, dependent on dormancy level, have different requirements for stimulation by the signalling network initiated by phytochrome A during the course of the very low fluence response inDatura feroxseeds.

Peroxisome division and proliferation in plants

2010 ◽  
Vol 38 (3) ◽  
pp. 817-822 ◽  
Author(s):  
Kyaw Aung ◽  
Xinchun Zhang ◽  
Jianping Hu
Keyword(s):  
Red Light ◽  
Specific Protein ◽  
Development Research ◽  
Phytochrome A ◽  
Division 1 ◽  
Evolutionarily Conserved ◽  
Organelle Division ◽  
Specific Factors ◽  
Related Proteins ◽  
Peroxisome Division

Peroxisomes are eukaryotic organelles with crucial functions in development. Plant peroxisomes participate in various metabolic processes, some of which are co-operated by peroxisomes and other organelles, such as mitochondria and chloroplasts. Defining the complete picture of how these essential organelles divide and proliferate will be instrumental in understanding how the dynamics of peroxisome abundance contribute to changes in plant physiology and development. Research in Arabidopsis thaliana has identified several evolutionarily conserved major components of the peroxisome division machinery, including five isoforms of PEROXIN11 proteins (PEX11), two dynamin-related proteins (DRP3A and DRP3B) and two FISSION1 proteins (FIS1A/BIGYIN and FIS1B). Recent studies in our laboratory have also begun to uncover plant-specific factors. DRP5B is a dual-localized protein that is involved in the division of both chloroplasts and peroxisomes, representing an invention of the plant/algal lineage in organelle division. In addition, PMD1 (peroxisomal and mitochondrial division 1) is a plant-specific protein tail anchored to the outer surface of peroxisomes and mitochondria, mediating the division and/or positioning of these organelles. Lastly, light induces peroxisome proliferation in dark-grown Arabidopsis seedlings, at least in part, through activating the PEX11b gene. The far-red light receptor phyA (phytochrome A) and the transcription factor HYH (HY5 homologue) are key components in this signalling pathway. In summary, pathways for the division and proliferation of plant peroxisomes are composed of conserved and plant-specific factors. The sharing of division proteins by peroxisomes, mitochondria and chloroplasts is also suggesting possible co-ordination in the division of these metabolically associated plant organelles.

scholarly journals Phosphorylation of FAR-RED ELONGATED HYPOCOTYL1 Is a Key Mechanism Defining Signaling Dynamics of Phytochrome A under Red and Far-Red Light in Arabidopsis

2012 ◽  
Vol 24 (5) ◽  
pp. 1907-1920 ◽  
Author(s):  
Fang Chen ◽  
Xiarong Shi ◽  
Liang Chen ◽  
Mingqiu Dai ◽  
Zhenzhen Zhou ◽  
...  
Keyword(s):  
Red Light ◽  
Phytochrome A ◽  
Signaling Dynamics
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