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Potassium homeostasis and signaling as a determinant of Echinacea species tolerance to salinity stress


Ahmadi, F and Samadi, A and Sepehr, E and Rahimi, A and Shabala, S, Potassium homeostasis and signaling as a determinant of Echinacea species tolerance to salinity stress, Environmental and Experimental Botany, 206 Article 105148. ISSN 0098-8472 (2023) [Refereed Article]

Copyright Statement

2022 Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.envexpbot.2022.105148


Salt tolerant is strongly related to potassium (K+) retention in plant tissues under salt stress conditions. However, it is unclear for different Echinacea species. So, mechanistic basis of four Echinacea species (i.e. Echinacea purpurea, Echinacea angustifolia, Echinacea pallida, and Echinacea sanguinea) to salinity stress tolerance, and K+ retention were assessed in the present study. Non-invasive microelectrode ion flux measuring, dehydroascorbate reductase (DHAR) and monodehydroascorbate reductase (MDHAR) activities, and pharmacological measurements were performed based on the standard methods. Ion flux measurements revealed higher K+ efflux in E. pallida and E. sanguinea species compared to the E. purpurea and E. angustifolia species in the elongation zone. Higher salinity-induced H+ efflux was found in the elongation zone than mature zone. However, E. angustifolia and E. purpurea had more Ca2+ influx compared to E. pallida and E. sanguinea species. Net K+ efflux decreased (> 90 %) in the presence of tetraethylammonium chloride (TEA) and GdCl3. Increasing of Ca2+ uptake and K+ loss in four Echinacea species roots were found in the presence of 0.3 mM Cu/Ascorbate (Cu/Asc). The significant role of H+-ATPase in H+ efflux was demonstrated by sodium orthovanadate. Ultimately, the physiological properties of Echinacea species have a critical role in salinity-resistant/sensitive differences. Future scientific understanding of Echinacea species physiognomies may be necessary for better understanding of the plant behavior to salinity stress.

Item Details

Item Type:Refereed Article
Keywords:salinity; potassium; tissue tolerance
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
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:Ahmadi, F ( Fatemeh Ahmadi)
UTAS Author:Shabala, S (Professor Sergey Shabala)
ID Code:155171
Year Published:2023
Web of Science® Times Cited:1
Deposited By:Agriculture and Food Systems
Deposited On:2023-01-31
Last Modified:2023-02-08

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