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Venus flytrap HKT1-type channel provides for prey sodium uptake into carnivorous plant without conflicting with electrical excitability
Citation
Bohm, J and Scherzer, S and Shabala, S and Krol, E and Neher, E and Mueller, TD and Hedrich, R, Venus flytrap HKT1-type channel provides for prey sodium uptake into carnivorous plant without conflicting with electrical excitability, Molecular Plant, 9, (3) pp. 428-436. ISSN 1674-2052 (2016) [Refereed Article]
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Copyright Statement
Copyright 2016 The Author Licenced under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) https://creativecommons.org/licenses/by-nc-nd/4.0/
DOI: doi:10.1016/j.molp.2015.09.017
Abstract
The animal diet of the carnivorous Venus flytrap, Dionaea muscipula, contains a sodium load that enters the capture organ via an HKT1-type sodium channel, expressed in special epithelia cells on the inner trap lobe surface. DmHKT1 expression and sodium uptake activity is induced upon prey contact. Here, we analyzed the HKT1 properties required for prey sodium osmolyte management of carnivorous Dionaea. Analyses were based on homology modeling, generation of model-derived point mutants, and their functional testing in Xenopus oocytes. We showed that the wild-type HKT1 and its Na+- and K+-permeable mutants function as ion channels rather than K+ transporters driven by proton or sodium gradients. These structural and biophysical features of a high-capacity, Na+-selective ion channel enable Dionaea glands to manage prey-derived sodium loads without confounding the action potential-based information management of the flytrap.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | sodium, HKT, membrane transport, sodium channel, sodium uptake, Dionaea muscipula, action potential, glands |
| Research Division: | Biological Sciences |
| Research Group: | Plant biology |
| Research Field: | Plant physiology |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding knowledge |
| Objective Field: | Expanding knowledge in the environmental sciences |
| UTAS Author: | Bohm, J (Ms Jennifer Bohm) |
| UTAS Author: | Shabala, S (Professor Sergey Shabala) |
| UTAS Author: | Hedrich, R (Professor Rainer Hedrich) |
| ID Code: | 107583 |
| Year Published: | 2016 |
| Web of Science® Times Cited: | 41 |
| Deposited By: | Tasmanian Institute of Agriculture |
| Deposited On: | 2016-03-18 |
| Last Modified: | 2017-11-02 |
| Downloads: | 238 View Download Statistics |
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