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External coincidence model for hypocotyl thermomorphogenesis.

Young-Joon Park¹, Chung-Mo Park^1,2

¹a Department of Chemistry , Seoul National University , Seoul , South Korea.

Plant Signaling & Behavior

|May 24, 2017

Summary

This summary is machine-generated.

Warm temperatures trigger hypocotyl elongation in plants by activating CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1), which degrades ELONGATED HYPOCOTYL 5 (HY5). This process integrates temperature and circadian clock signals for plant growth.

Keywords:

COP1 Circadian clock HY5 hypocotyl growth thermomorphogenesis

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Area of Science:

Plant Biology
Molecular Biology
Chronobiology

Background:

High temperatures influence plant growth and development, a process known as thermomorphogenesis.
Thermo-induced hypocotyl elongation is a key trait for cooling plant organs.
Light signals and the circadian clock regulate rhythmic hypocotyl growth, but their interaction with temperature remains unclear.

Purpose of the Study:

To elucidate how light, temperature, and circadian rhythms are harmonized during hypocotyl thermomorphogenesis.
To investigate the role of the E3 ubiquitin ligase CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) in temperature-mediated plant growth.

Main Methods:

Investigated the activation and localization of COP1 under warm temperatures.
Analyzed the degradation of ELONGATED HYPOCOTYL 5 (HY5) protein in response to temperature.
Examined the interplay between temperature signaling, light conditions, and circadian clock components like CIRCADIAN CLOCK ASSOCIATED 1 (CCA1).

Main Results:

Warm temperatures activate COP1, promoting its nuclear import.
COP1 facilitates the degradation of HY5, a process independent of light conditions.
Thermo-induced HY5 turnover is uncoupled from circadian rhythms, with COP1-HY5 mediating temperature signals.
Clock components like CCA1 provide timing information for rhythmic thermomorphogenic growth.

Conclusions:

The COP1-HY5 module acts as a temperature sensor, conveying warm temperature information independently of light and circadian rhythms.
Circadian clock components ensure proper timing of thermomorphogenic responses.
These mechanisms allow for the coincidence of temperature signaling and circadian rhythms, explaining rhythmic hypocotyl growth under warm conditions.