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Pawel Mikulski¹, Javier Santos-Aberturas²

¹Cell and Developmental Biology, John Innes Centre Norwich UK.

Plant-Environment Interactions (Hoboken, N.J.)

|June 7, 2023

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Nonvascular plants, like the green alga Chlamydomonas reinhardtii, exhibit metabolic stress memory. Recurrent nitrogen deprivation leads to differential lipid accumulation, impacting cellular responses to environmental instability.

Area of Science:

Plant Science
Cellular Biology
Biochemistry

Background:

Stress memory, where prior stress exposure alters subsequent responses, is known in vascular plants.
Its occurrence in nonvascular plants, particularly regarding metabolic stress, remains under-investigated.
Understanding stress memory is crucial for comprehending cellular adaptation in dynamic environments.

Purpose of the Study:

To investigate the occurrence of metabolic stress memory in the nonvascular plant Chlamydomonas reinhardtii.
To test the hypothesis that stress memory influences lipid accumulation (triacylglycerols) under nitrogen deprivation.

Main Methods:

Established a stress memory protocol using Chlamydomonas reinhardtii cells.
Subjected cells to single and recurrent nitrogen deprivation stress.

Keywords:

Chlamydomonas algae biofuel epigenetics stress memory triacylglycerols

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Analyzed lipid accumulation using microscopy and gas chromatography.

Main Results:

Cells exposed to recurrent stress showed quantitatively differential accumulation of triacylglycerols compared to single stress controls.
No qualitative changes in lipid composition were observed between single and recurrent stress conditions.
The findings suggest a quantitative metabolic stress memory in C. reinhardtii.

Conclusions:

Metabolic stress memory occurs in the nonvascular plant Chlamydomonas reinhardtii.
This study provides a foundation for characterizing the mechanisms of metabolic stress memory.
Findings have relevance for both basic science and industrial applications of algae.