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Autofluorescence Imaging to Evaluate Red Algae Physiology

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Tim P Rieseberg¹, Armin Dadras², Tatyana Darienko^2,3

¹University of Göttingen, Institute of Microbiology and Genetics, Department of Applied Bioinformatics, Goldschmidtstr. 1, 37077, Göttingen, Germany. timphilipp.rieseberg@uni-goettingen.de.

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Summary

Early land plants developed sophisticated stress response networks. These ancient gene regulatory networks, involving ethylene signaling and kinase hubs, integrated environmental signals before plants colonized land.

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Area of Science:

Plant Biology
Evolutionary Biology
Molecular Biology

Background:

The transition of plants to land presented significant environmental challenges, including rapid fluctuations in light and temperature.
While key genetic components for stress responses are shared between land plants and their algal relatives (streptophytes), their coordinated function remains poorly understood.

Purpose of the Study:

To investigate the kinetics of stress responses in streptophytes.
To elucidate the gene regulatory networks underlying dynamic stress adaptation in early land plants and their relatives.

Main Methods:

Utilized time-course stress profiling incorporating photophysiology, transcriptomics (2.7 Tbp data), and metabolite profiling (270 samples).
Analyzed three streptophyte species with 600 million years of divergence.
Employed co-expression analysis and Granger causal inference to predict gene regulatory networks.

Main Results:

Identified a gene regulatory network that reveals ancient signal convergence points.
Key convergence points include ethylene signaling components, osmosensors, and major kinase cascades.
Demonstrated that these kinase hubs were integrated with diverse environmental inputs even before the terrestrial colonization by plants.

Conclusions:

The study reveals the ancient origins of complex stress-response regulatory networks in streptophytes.
These findings highlight the pre-adaptation of signaling pathways for environmental integration prior to the evolution of land plants.