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Terrestrialization: Stress Signalling Dynamics in the Algal Progenitors of Land Plants

Project description

Algal resiliency to stress may be their key to survival

Land plants, just like terrestrial animals, can trace their ancestors to the oceans. However, all terrestrial plants descended from a single ancestor, a streptophyte algae. The unsolved mystery is what favoured these particular algae in their ultimately successful quest to conquer land. Recently, scientists identified the modern-day streptophyte algal lineage most closely related to the algal land plant ancestor. TerreStriAL, building on researchers’ earlier data that show these algae possess genes for a land plant stress response hormone, is headed for the Holy Grail. Algal model systems will enable scientists to study stress pathways in algae. Plugging these processes into in silico models will help researchers fast-forward the evolutionary process and see if the algae end up as land-based plants.

Objective

Land plants abound on Earth’s surface. All of this diversity arose in a singular event. The algal progenitor of land plants was a streptophyte alga and only recent phylogenomic analyses have specified the particular algal lineage that is most closely related to land plants. But why did land plants evolve only once? And what properties did the ancestors of these terrestrial organisms possess that allowed them to conquer land? Life on land involves rapid and drastic shifts in temperature, light or water availability. Hence, a prime candidate property is the ability to deal with these terrestrial stressors by dynamically responding to shifting environmental cues. My recent data highlight that the streptophyte algae closest to land plants have the genetic makeup for land plant-like stress response signalling circuits—including genes for sensing the major stress phytohormone abscisic acid (ABA). This provides us with testable candidates. To shed light on the early evolution of one of land plants’ key properties, I, here, propose to combine in-depth molecular biological analyses of these candidate stress signalling and response pathways with large-scale systems biology approaches. For this, my team and I will develop streptophyte algal model systems. We will dissect the regulatory hierarchy employed during stress signalling and the response pathways it is regulating in real-time in vivo and across evolutionary time in silico. These approaches will go beyond a view of gene evolution that is based on presence/absence to address if land plant stress dynamics have evolved from algal stress regulatory networks that became hardwired into land plant biology. The aim of this work is to infer the biology of the earliest land plants by investigating their closest algal relatives and interrogating a candidate mechanism used to deal with the challenges of life on land. Understanding this mechanism means understanding a key player that paved the way for the success of plants on land.

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Coordinator

GEORG-AUGUST-UNIVERSITAT GOTTINGEN STIFTUNG OFFENTLICHEN RECHTS
Net EU contribution
€ 1 494 226,00
Address
Wilhelmsplatz 1
37073 Gottingen
Germany

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Region
Niedersachsen Braunschweig Göttingen
Activity type
Higher or Secondary Education Establishments
Links
Other funding
€ 0,00

Beneficiaries (1)