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Related Experiment Video

Updated: Jul 20, 2026

Investigating Tissue- and Organ-specific Phytochrome Responses using FACS-assisted Cell-type Specific Expression Profiling in Arabidopsis thaliana

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Published on: May 29, 2010

Green light adjusts the plastid transcriptome during early photomorphogenic development.

Amit Dhingra¹, Dawn H Bies, Kevin R Lehner

¹Plant Molecular and Cellular Biology Program and Horticultural Sciences Department, University of Florida, Gainesville, Florida 32611, USA.

Plant Physiology

|September 19, 2006

Summary

Green light exposure triggers stem elongation and reduces plastid-encoded transcripts in Arabidopsis seedlings. This response, independent of known photosensors, helps plants adapt to new light conditions.

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Area of Science:

Plant biology
Molecular biology
Photomorphogenesis

Background:

Plants acclimate to light changes via sensors regulating gene expression and morphology.
While UV, blue, red, and far-red light modulate plant development, green light uniquely promotes stem elongation.
The mechanism behind green light-induced stem elongation and its effect on gene expression remain unclear.

Purpose of the Study:

To investigate the impact of green light on gene expression in etiolated Arabidopsis seedlings.
To identify molecular responses to green light, particularly changes in transcript abundance.
To determine if green light responses are mediated by known photosensory pathways.

Main Methods:

Etiolated Arabidopsis seedlings were exposed to a single pulse of green light.
Genome microarrays were used to analyze changes in gene expression.
RNA gel-blot experiments confirmed specific transcript changes and response kinetics.

Main Results:

Green light induced phytochrome A-regulated nuclear transcripts, confirming photosensor system function.
A significant decrease in the abundance of plastid-encoded transcripts was observed.
This down-regulation was specific to green light, fluence-dependent, and occurred rapidly (within 30 min).
The response persisted even without known photosensors and was also seen in tobacco.

Conclusions:

Green light triggers a unique response involving stem elongation and plastid transcript down-regulation.
This mechanism is independent of known photosensors, suggesting novel signaling pathways.
The observed response helps regulate early seedling development and establishment in response to light cues.