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Brassinosteroid signaling-dependent root responses to prolonged elevated ambient temperature.

Sara Martins¹, Alvaro Montiel-Jorda¹, Anne Cayrel¹

¹Institute for Integrative Biology of the Cell (I2BC), CNRS/CEA/Univ. Paris Sud, Université Paris-Saclay, 91198, Gif-sur-Yvette, France.

Nature Communications

|August 23, 2017

Summary

Elevated temperatures enhance plant root growth by reducing brassinosteroid signaling. This involves a decrease in the brassinosteroid receptor BRI1, impacting root elongation independently of auxin.

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Area of Science:

Plant Biology
Environmental Science
Molecular Biology

Background:

Plants adapt to environmental changes, with temperature influencing growth.
Shoot growth is stimulated by elevated temperatures via auxin.
Root responses to increased ambient temperature remain poorly understood.

Purpose of the Study:

To investigate how elevated ambient temperature affects Arabidopsis root growth.
To elucidate the hormonal signaling pathways involved in temperature-mediated root growth.
To determine the role of brassinosteroid signaling in plant root responses to heat.

Main Methods:

Arabidopsis thaliana growth experiments under elevated temperatures.
Analysis of root elongation and shoot growth.
Hormonal signaling pathway analysis, focusing on auxin and brassinosteroids.
Quantification of brassinosteroid receptor BRI1 levels.

Main Results:

Elevated temperatures increase Arabidopsis root elongation independently of auxin.
Brassinosteroid signaling is crucial for root responses to elevated temperatures.
Increased growth temperature reduces brassinosteroid receptor BRI1 protein levels, downregulating brassinosteroid signaling.
This downregulation of brassinosteroid signaling mediates increased root elongation.

Conclusions:

Brassinosteroid signaling, specifically through BRI1, regulates root growth in response to elevated temperatures.
BRI1 integrates temperature cues and brassinosteroid signals to control root growth.
These findings are relevant for understanding plant adaptation to climate change and global warming.