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https://hdl.handle.net/2440/96447
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Type: | Journal article |
Title: | Ion transport in broad bean leaf mesophyll under saline conditions |
Author: | Percey, W. Shabala, L. Breadmore, M. Guijt, R. Bose, J. Shabala, S. |
Citation: | Planta: an international journal of plant biology, 2014; 240(4):729-743 |
Publisher: | Springer |
Issue Date: | 2014 |
ISSN: | 0032-0935 1432-2048 |
Statement of Responsibility: | William J. Percey, Lana Shabala, Michael C. Breadmore, Rosanne M. Guijt, Jayakumar Bose, Sergey Shabala |
Abstract: | Main conclusion Salt stress reduces the ability of mesophyll tissue to respond to light. Potassium outward rectifying channels are responsible for 84 % of Na⁺ induced potassium efflux from mesophyll cells. 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 nonselective 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. |
Keywords: | Flux; H⁺-ATPase; membrane potential; potassium; photosynthesis |
Rights: | © Springer-Verlag Berlin Heidelberg 2014 |
DOI: | 10.1007/s00425-014-2117-z |
Grant ID: | http://purl.org/au-research/grants/arc/DP0987402 |
Published version: | http://dx.doi.org/10.1007/s00425-014-2117-z |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 3 |
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