title: Study of essential element accumulation in the leaves of a Cu-tolerant plant Elsholtzia splendens after Cu treatment by imaging laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS).
abstract: Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was used for the quantitative imaging of Cu and other essential elements (such as K, Mg, Mn, P, S and B) in the leaves of a Cu-tolerant plant Elsholtzia splendens treated with the enriched (65)Cu isotope tracer (isotope abundance of 89.2%). The leaves (newly formed, fully grown and oldest) were scanned directly with a focused Nd:YAG laser in the laser ablation chamber. The ablated material was transported with argon as carrier gas to a quadrupole-based ICP-MS (ICP-QMS), and the ion intensities of (65)Cu(+), (39)K(+), (24)Mg(+), (55)Mn(+), (31)P(+), (34)S(+) and (11)B(+) were measured by ICP-QMS to study the accumulation of Cu and other elements of interest. Standard reference material NIST SRM 1515 Apple Leaves doped with known concentrations of analytes (from 0.1 to 2000mgL(-1)) was measured together with the samples by LA-ICP-MS and was used for the quantification of the analytical data. Notable accumulation of Cu in the newly formed leaves was clearly identified by imaging LA-ICP-MS. The increased isotope ratios of (65)Cu/(63)Cu measured by LA-ICP-MS demonstrated the path of Cu uptake and accumulation via the petiole and main veins in the leaves. Cu stress-induced accumulation of K, Mg, Mn, P and S in the newly formed leaves was observed, while B was not significantly affected. In the present study, the concentrations of K, Mg, Mn, P and S were not obviously changed in the fully grown leaves after short-term treatment. Along with the treatment, a visible decrease of K and P was found in the oldest leaves, while other elements were not influenced by Cu stress.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou, 310029, China.
authors.forename: Bei
authors.initials: B
authors.lastname: Wu
authors.forename: Yingxu
authors.initials: Y
authors.lastname: Chen
authors.forename: J Sabine
authors.initials: JS
authors.lastname: Becker
mesh_terms: D002138:Calibration; D003300:Copper / Q000032:analysis* / Q000378:metabolism*; D004602:Elements; D007554:Isotopes / Q000032:analysis / Q000378:metabolism; D019686:Lamiaceae / Q000737:chemistry*; D053685:Laser Therapy / Q000379:methods; D013058:Mass Spectrometry; D018515:Plant Leaves / Q000737:chemistry*
chemical_list: D004602:Elements; D007554:Isotopes; D003300:Copper