eCite Digital Repository

The evolution of plant proton pump regulation via the R domain may have facilitated plant terrestrialization


Steger, A and Hayashi, M and Lauritzen, EW and Herburger, K and Shabala, L and Wang, C and Bendtsen, AK and Norrevang, AF and Madriz-Ordenana, K and Ren, S and Trinh, MDL and Thordal Christensen, H and Fuglsang, AT and Shabala, S and Osterberg, JT and Palmgren, M, The evolution of plant proton pump regulation via the R domain may have facilitated plant terrestrialization, Communications Biology, 5, (1) Article 1312. ISSN 2399-3642 (2022) [Refereed Article]

Pending copyright assessment - Request a copy

DOI: doi:10.1038/s42003-022-04291-y


Plasma membrane (PM) H+-ATPases are the electrogenic proton pumps that export H+ from plant and fungal cells to acidify the surroundings and generate a membrane potential. Plant PM H+-ATPases are equipped with a C‑terminal autoinhibitory regulatory (R) domain of about 100 amino acid residues, which could not be identified in the PM H+-ATPases of green algae but appeared fully developed in immediate streptophyte algal predecessors of land plants. To explore the physiological significance of this domain, we created in vivo C-terminal truncations of autoinhibited PM H+‑ATPase2 (AHA2), one of the two major isoforms in the land plant Arabidopsis thaliana. As more residues were deleted, the mutant plants became progressively more efficient in proton extrusion, concomitant with increased expansion growth and nutrient uptake. However, as the hyperactivated AHA2 also contributed to stomatal pore opening, which provides an exit pathway for water and an entrance pathway for pests, the mutant plants were more susceptible to biotic and abiotic stresses, pathogen invasion and water loss, respectively. Taken together, our results demonstrate that pump regulation through the R domain is crucial for land plant fitness and by controlling growth and nutrient uptake might have been necessary already for the successful water-to-land transition of plants.

Item Details

Item Type:Refereed Article
Keywords:evolution; H+ ATPase;
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant cell and molecular biology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Other plant production and plant primary products
Objective Field:Other plant production and plant primary products not elsewhere classified
UTAS Author:Shabala, L (Associate Professor Lana Shabala)
UTAS Author:Shabala, S (Professor Sergey Shabala)
ID Code:155135
Year Published:2022
Deposited By:Agriculture and Food Systems
Deposited On:2023-01-30
Last Modified:2023-01-31

Repository Staff Only: item control page