Elementary Processes of Photoperception by Phytochrome A for High-Irradiance Response of Hypocotyl Elongation in Arabidopsis,

Shinomura, Tomoko; Uchida, Kenko; Furuya, Masaki

doi:10.1104/pp.122.1.147

Cited by 190 publications

(163 citation statements)

References 65 publications

Supporting

Mentioning

158

Contrasting

Unclassified

Order By: Relevance

“…The function of the light unstable phyA is more complex because it participates in at least three photosensory modes: the very low fluence response (VLFR) and the high irradiance response (HIR) to FR and, as recently shown, to R light as well (Casal et al, 2000, Franklin et al, 2007. The light treatments required to trigger the responses are distinct: the VLFR is activated by very low intensity light of any visible wavelength (fluences below 1 mmol m 22 of light) (Botto et al, 1996;Shinomura et al, 1996), whereas the FR-HIR is induced by higher fluences of continuous far-red light (Shinomura et al, 2000) and the R-HIR by strong red light (above 100 mmol m 22 s 21 ) (Franklin et al, 2007). Moreover, phyA in its VLFR mode antagonizes phyB operating in the LFR mode, whereas phyA in the FR-HIR mode enhances phyB action in the LFR (Cerdan et al, 1999;Hennig et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

OWL1: An Arabidopsis J-Domain Protein Involved in Perception of Very Low Light Fluences

Kneissl¹,

Wachtler

Chua

et al. 2009

Plant Cell

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

OWL1: An Arabidopsis J-Domain Protein Involved in Perception of Very Low Light Fluences

Kneissl¹,

Wachtler

Chua

et al. 2009

Plant Cell

View full text Add to dashboard Cite

“…Indeed, in Arabidopsis, phyA and phyB are the principal mediators of red light-mediated development in FR-and R-rich environments, respectively (Figure 1). phyA is the predominant form in etiolated tissue and mediates germination, deetiolation, and daylength perception under continuous FR (Nagatani et al, 1993;Parks and Quail, 1993;Whitelam et al, 1993;van Tuinen et al, 1995;Shinomura et al, 2000;Takano et al, 2001), where it may also condition early neighbor detection . Due to rapid protein degradation and decreased transcription in the light (Sharrock and Clack, 2002), phyA has a reduced ability to antagonize shade avoidance responses under canopies once seedlings are established, although a persistent FR-HIR has been detected in woodland genotypes of Impatiens capensis (von Wettberg and Schmitt, 2005).…”

Section: Phytochrome Activities Under Canopies May Be Antagonisticmentioning

confidence: 99%

Evolutionary Studies Illuminate the Structural-Functional Model of Plant Phytochromes

Mathews

2010

The Plant Cell

107

View full text Add to dashboard Cite

A synthesis of insights from functional and evolutionary studies reveals how the phytochrome photoreceptor system has evolved to impart both stability and flexibility. Phytochromes in seed plants diverged into three major forms, phyA, phyB, and phyC, very early in the history of seed plants. Two additional forms, phyE and phyD, are restricted to flowering plants and Brassicaceae, respectively. While phyC, D, and E are absent from at least some taxa, phyA and phyB are present in all sampled seed plants and are the principal mediators of red/far-red-induced responses. Conversely, phyC-E apparently function in concert with phyB and, where present, expand the repertoire of phyB activities. Despite major advances, aspects of the structural-functional models for these photoreceptors remain elusive. Comparative sequence analyses expand the array of locus-specific mutant alleles for analysis by revealing historic mutations that occurred during gene lineage splitting and divergence. With insights from crystallographic data, a subset of these mutants can be chosen for functional studies to test their importance and determine the molecular mechanism by which they might impact light perception and signaling. In

show abstract

“…These findings suggest that the responses are governed by the same light receptor and that it is not likely one of the described plant light sensors. However, because phytochrome and cryptochrome receptors are sensitive to GL (Mandoli and Briggs, 1981;Lin et al, 1995;Shinomura et al, 1996Shinomura et al, , 2000, the role, if any, of known light sensors in the GL-induced decrease of select plastid transcripts must be formally assessed using photomorphogenic mutants.…”

Section: Genetic Analysesmentioning

confidence: 99%

Green Light Adjusts the Plastid Transcriptome during Early Photomorphogenic Development

et al. 2006

View full text Add to dashboard Cite

During the transition from darkness to light, a suite of light sensors guides gene expression, biochemistry, and morphology to optimize acclimation to the new environment. Ultraviolet, blue, red, and far-red light all have demonstrated roles in modulating light responses, such as changes in gene expression and suppression of stem growth rate. However, green wavebands induce stem growth elongation, a response not likely mediated by known photosensors. In this study, etiolated Arabidopsis (Arabidopsis thaliana) seedlings were treated with a short, dim, single pulse of green light comparable in fluence and duration to that previously shown to excite robust stem elongation. Genome microarrays were then used to monitor coincident changes in gene expression. As anticipated, phytochrome A-regulated, nuclear-encoded transcripts were induced, confirming proper function of the sensitive phytochrome system. In addition, a suite of plastid-encoded transcripts decreased in abundance, including several typically upregulated after phytochrome and/or cryptochrome activation. Further analyses using RNA gel-blot experiments demonstrated that the response is specific to green light, fluence dependent, and detectable within 30 min. The response obeys reciprocity and persists in the absence of known photosensors. Plastid transcript down-regulation was also observed in tobacco (Nicotiana tabacum) with similar temporal and fluence-response kinetics. Together, the down-regulation of plastid transcripts and increase in stem growth rate represent a mechanism that tempers progression of early commitment to the light environment, helping tailor seedling development during the critical process of establishment.

show abstract

Elementary Processes of Photoperception by Phytochrome A for High-Irradiance Response of Hypocotyl Elongation in Arabidopsis,

Cited by 190 publications

References 65 publications

OWL1: An Arabidopsis J-Domain Protein Involved in Perception of Very Low Light Fluences

OWL1: An Arabidopsis J-Domain Protein Involved in Perception of Very Low Light Fluences

Evolutionary Studies Illuminate the Structural-Functional Model of Plant Phytochromes

Green Light Adjusts the Plastid Transcriptome during Early Photomorphogenic Development

Contact Info

Product

Resources

About