Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/122560
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Type: Journal article
Title: A laser ablation technique maps differences in elemental composition in roots of two barley cultivars subjected to salinity stress
Author: Shelden, M.C.
Gilbert, S.E.
Tyerman, S.D.
Citation: The Plant Journal, 2020; 101(6):1462-1473
Publisher: Wiley
Issue Date: 2020
ISSN: 0960-7412
1365-313X
Statement of
Responsibility: 
Megan C. Shelden, Sarah E. Gilbert and Stephen D. Tyerman
Abstract: In saline soils, high levels of sodium (Na+ ) and chloride (Cl- ) ions, reduce root growth by inhibiting cell division and elongation, thereby impacting on crop yield. Soil salinity can lead to Na+ toxicity of plant cells, influencing the uptake and retention of other important ions (ie. potassium (K+ )) required for growth. However, measuring and quantifying soluble ions in their native, cellular environment is inherently difficult. Technologies that allow in situ profiling of plant tissues are fundamental for our understanding of abiotic stress responses and the development of tolerant crops. Here, we employ laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to quantify Na, K and other elements (calcium (Ca), magnesium (Mg), sulphur (S), phosphorus (P), iron (Fe)) at high spatial resolution in the root growth zone of two genotypes of barley (Hordeum vulgare) that differ in salt-tolerance, cv. Clipper (tolerant) and Sahara (sensitive). The data show that Na+ was excluded from the meristem and cell division zone, indicating that Na+ toxicity is not directly reducing cell division in the salt-sensitive genotype, Sahara. Interestingly, in both genotypes, K+ was strongly correlated with Na+ concentration, in response to salt stress. In addition, we also show important genetic differences and salt-specific changes in elemental composition in the root growth zone. These results show that LA-ICP-MS can be used for fine mapping of soluble ions (ie. Na+ and K+ ) in plant tissues, providing insight into the link between Na+ toxicity and root growth responses to salt stress.
Keywords: abiotic stress; barley; cell division; ionome; laser ablation ICP-MS; meristem; root elongation; root growth; salinity; toxicity
Rights: © 2019 The Authors. The Plant Journal © 2019 John Wiley & Sons Ltd
RMID: 1000004365
DOI: 10.1111/tpj.14599
Grant ID: http://purl.org/au-research/grants/arc/DE140100575
http://purl.org/au-research/grants/arc/CE140100008
Appears in Collections:Agriculture, Food and Wine publications

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