Getting back to nature: a reality check for experiments in controlled environments.

Area of Science:

• Plant science
• Metabolomics
• Environmental science

Background:

• Sunlight irradiance follows a natural sinusoidal pattern with fluctuations.
• Controlled environment studies often use constant light and abrupt transitions.
• Plant metabolism may respond differently to natural versus artificial light.

Purpose of the Study:

• To compare the metabolic effects of natural sunlight versus artificial light on Arabidopsis thaliana.
• To investigate the impact of constant versus sinusoidal light profiles and different artificial light sources.
• To determine if artificial lighting accurately represents natural light conditions for plant studies.

Main Methods:

• Arabidopsis thaliana were grown under natural sunlight and controlled artificial light (fluorescent and LED) with constant or sinusoidal profiles.
• Metabolite analysis was performed on plant samples over a 24-hour diurnal cycle.
• Light conditions simulated natural daylight patterns and artificial light regimes.

Main Results:

• Significant differences in carbon and nitrogen metabolism were observed between plants grown under sunlight and artificial light.
• Variability in natural sunlight appeared to influence metabolic profiles.
• Differences between artificial light sources (fluorescent vs. LED) and light profiles (constant vs. sinusoidal) were minor.

Conclusions:

• Artificial lighting, particularly energy-efficient LEDs, can be a suitable alternative to fluorescent lights.
• Metabolic responses under artificial lighting may not fully represent those under natural sunlight conditions.
• The variability inherent in natural sunlight is a critical factor influencing plant metabolism.