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Xylem ionic relations and salinity tolerance in barley.
Plant J. 2010 Mar; 61(5):839-53.PJ

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.

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Authors+Show Affiliations

Shabala S
School of Agricultural Science, University of Tasmania, Hobart, Tas 7001, Australia. Sergey.Shabala@utas.edu.au
Shabala S
No affiliation info available
Cuin TA
No affiliation info available
Pang J
No affiliation info available
Percey W
No affiliation info available
Chen Z
No affiliation info available
Conn S
No affiliation info available
Eing C
No affiliation info available
Wegner LH
No affiliation info available

MeSH

GenotypeHordeumMembrane PotentialsMicroelectrodesPatch-Clamp TechniquesPlant LeavesPotassiumSalinitySalt-Tolerant PlantsSodiumXylem

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20015063

Citation

Shabala, Sergey, et al. "Xylem Ionic Relations and Salinity Tolerance in Barley." The Plant Journal : for Cell and Molecular Biology, vol. 61, no. 5, 2010, pp. 839-53.
Shabala S, Shabala S, Cuin TA, et al. Xylem ionic relations and salinity tolerance in barley. Plant J. 2010;61(5):839-53.
Shabala, S., Shabala, S., Cuin, T. A., Pang, J., Percey, W., Chen, Z., Conn, S., Eing, C., & Wegner, L. H. (2010). Xylem ionic relations and salinity tolerance in barley. The Plant Journal : for Cell and Molecular Biology, 61(5), 839-53. https://doi.org/10.1111/j.1365-313X.2009.04110.x
Shabala S, et al. Xylem Ionic Relations and Salinity Tolerance in Barley. Plant J. 2010;61(5):839-53. PubMed PMID: 20015063.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Xylem ionic relations and salinity tolerance in barley. AU - Shabala,Sergey, AU - Shabala,Svetlana, AU - Cuin,Tracey A, AU - Pang,Jiayin, AU - Percey,William, AU - Chen,Zhonghua, AU - Conn,Simon, AU - Eing,Christian, AU - Wegner,Lars H, Y1 - 2009/12/15/ PY - 2009/12/18/entrez PY - 2009/12/18/pubmed PY - 2010/7/17/medline SP - 839 EP - 53 JF - The Plant journal : for cell and molecular biology JO - Plant J VL - 61 IS - 5 N2 - 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. SN - 1365-313X UR - https://www.unboundmedicine.com/medline/citation/20015063/Xylem_ionic_relations_and_salinity_tolerance_in_barley_ L2 - https://doi.org/10.1111/j.1365-313X.2009.04110.x DB - PRIME DP - Unbound Medicine ER -