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Network Analysis Reveals a Role for Salicylic Acid Pathway Components in Shade Avoidance
Kazunari Nozue1, Upendra Kumar Devisetty1, Saradadevi Lekkala1
1Department of Plant Biology, University of California, Davis, California 95616.
Plant Physiology
|October 24, 2018
Summary
Plants sense neighbor shade and grow towards light. This study reveals salicylic acid signaling is crucial for petiole elongation in adult plants, a key shade avoidance response.
Area of Science:
- Plant Biology
- Molecular Biology
- Genetics
Background:
- Plants possess advanced mechanisms to detect neighbor shade and optimize light capture through enhanced growth.
- The shade avoidance response influences various plant organs and developmental stages, but its signaling pathways are primarily studied in seedlings.
Purpose of the Study:
- To map transcriptional changes in response to shade in adult Arabidopsis plants over time.
- To identify key signaling genes and their downstream effects in the shade avoidance response.
- To investigate the role of salicylic acid in regulating shade avoidance.
Main Methods:
- Transcriptome analysis of wild-type and mutant Arabidopsis thaliana over a 2-day shade treatment time course.
- Assaying shade avoidance responses, including petiole elongation, hypocotyl elongation, and flowering time, in various mutants.
- Investigating the relationship between salicylic acid signaling and shade avoidance phenotypes.
Main Results:
- A temporal map of transcriptional responses to shade in adult plants was generated, distinguishing early and late responses.
- A strong, unexpected link between shade avoidance and salicylic acid-related genes was identified.
- Mutants affecting salicylic acid levels or signaling exhibited defects in shade avoidance, specifically in petiole elongation, but not hypocotyl elongation or flowering time.
- Shade treatment did not alter salicylic acid levels, indicating salicylic acid's role is independent of its concentration.
Conclusions:
- Salicylic acid signaling is a critical regulator of petiole elongation in adult plants during shade avoidance.
- The shade avoidance signaling pathway exhibits stage-specific differences, with salicylic acid playing a key role in adult responses.
- Salicylic acid pathway genes are integral components of petiole shade avoidance, independent of changes in salicylic acid levels.
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