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Ion transport in broad bean leaf mesophyll under saline conditions
Citation
Percey, WJ and Shabala, L and Breadmore, MC and Guijt, RM and Bose, J and Shabala, S, Ion transport in broad bean leaf mesophyll under saline conditions, Planta, 240, (4) pp. 729-743. ISSN 0032-0935 (2014) [Refereed Article]
Copyright Statement
Copyright 2014 Springer-Verlag Berlin Heidelberg
DOI: doi:10.1007/s00425-014-2117-z
Abstract
Modulation in ion transport of broad bean (Vicia faba L.) mesophyll to light under increased apoplastic salinity stress was investigated using vibrating ion-selective microelectrodes (the MIFE technique). Increased apoplastic Na+ significantly affected mesophyll cells ability to respond to light by modulating ion transport across their membranes. Elevated apoplastic Na+ also induced a significant K+ efflux from mesophyll tissue. This efflux was mediated predominately by potassium outward rectifying channels (84 %) and the remainder of the efflux was through non-selective cation channels. NaCl treatment resulted in a reduction in photosystem II efficiency in a dose- and time-dependent manner. In particular, reductions in Fv′/Fm′ were linked to K+ homeostasis in the mesophyll tissue. Increased apoplastic Na+ concentrations induced vanadate-sensitive net H+ efflux, presumably mediated by the plasma membrane H+-ATPase. It is concluded that the observed pump’s activation is essential for the maintenance of membrane potential and ion homeostasis in the cytoplasm of mesophyll under salt stress.
Item Details
Item Type: | Refereed Article |
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Keywords: | salinity, broad bean, mesophyll, flux, membrane potential, potassium, photosynthesis, H+-ATPase |
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 biological sciences |
UTAS Author: | Percey, WJ (Mr William Percey) |
UTAS Author: | Shabala, L (Associate Professor Lana Shabala) |
UTAS Author: | Breadmore, MC (Professor Michael Breadmore) |
UTAS Author: | Guijt, RM (Dr Rosanne Guijt) |
UTAS Author: | Bose, J (Dr Jayakumar Bose) |
UTAS Author: | Shabala, S (Professor Sergey Shabala) |
ID Code: | 93364 |
Year Published: | 2014 |
Web of Science® Times Cited: | 15 |
Deposited By: | Tasmanian Institute of Agriculture |
Deposited On: | 2014-07-29 |
Last Modified: | 2017-11-02 |
Downloads: | 0 |
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