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https://hdl.handle.net/2440/57741
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Type: | Journal article |
Title: | Xylem ionic relations and salinity tolerance in barley |
Author: | Shabala, Sergey Shabala, Svetlana Cuin, Tracey A. Pang, Jiayin Percey, William Chen, Zhonghua Conn, Simon James Eing, Christian Wegner, Lars H. |
Citation: | Plant Journal, 2010; 61(5):839-853 |
Publisher: | Blackwell |
Issue Date: | 2010 |
ISSN: | 0960-7412 |
School/Discipline: | School of Agriculture, Food and Wine |
Statement of Responsibility: | salt stress; xylem sap; potassium; sodium; ion channels; membrane depolarization |
Abstract: | Control of ion loading into the xylem has been repeatedly named as a crucial factor determining plant salt tolerance. In this study we further investigate this issue by applying a range of biophysical [the microelectrode ion flux measurement (MIFE) technique for non-invasive ion flux measurements, the patch clamp technique, membrane potential measurements] and physiological (xylem sap and tissue nutrient analysis, photosynthetic characteristics, stomatal conductance) techniques to barley varieties contrasting in their salt tolerance. We report that restricting Na+ loading into the xylem is not essential for conferring salinity tolerance in barley, with tolerant varieties showing xylem Na+ concentrations at least as high as those of sensitive ones. At the same time, tolerant genotypes are capable of maintaining higher xylem K+/Na+ ratios and efficiently sequester the accumulated Na+ in leaves. The former is achieved by more efficient loading of K+ into the xylem. We argue that the observed increases in xylem K+ and Na+ concentrations in tolerant genotypes are required for efficient osmotic adjustment, needed to support leaf expansion growth. We also provide evidence that K+-permeable voltage-sensitive channels are involved in xylem loading and operate in a feedback manner to maintain a constant K+/Na+ ratio in the xylem sap. |
DOI: | 10.1111/j.1365-313X.2009.04110.x |
Appears in Collections: | Agriculture, Food and Wine publications |
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