Influence of a plant biostimulant on the uptake, distribution and speciation of Se in Se-enriched wheat ( Triticum aesti
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Influence of a plant biostimulant on the uptake, distribution and speciation of Se in Se-enriched wheat (Triticum aestivum L. cv. Pinzón) Tingting Xiao & Roberto Boada & Carlo Marini & Mercè Llugany & Manuel Valiente
Received: 2 May 2020 / Accepted: 17 August 2020 # Springer Nature Switzerland AG 2020
Abstract Aim Selenium (Se) can induce stress in plants. Our main purpose is to assess the effect of a biostimulant, based on hetero-polyoxometalates mixed with humic acids, on Se bio-fortified wheat plants. Secondly, to evaluate a possible modification of the Se species in the plant tissues and to investigate the response of phytohormones. Method Wheat plants were grown hydroponically and exposed to either selenite (Se(IV)), selenate (Se(VI)) or a mixture of both species (Se(MIX)) in the presence or absence of the biostimulant (foliar, FA; or root application, RA). Biomass, mineral nutrient concentration, phytohormones and Se speciation were investigated. Results The biostimulant FA did not modify the plant biomass but RA significantly increased the root biomass
in all treatments as well as the shoot biomass of plants exposed to Se(VI) and Se(MIX) even when both modes of application caused a severe reduction of IAA levels in shoots. The biostimulant accelerated the translocation of Se from roots to shoots in the presence of Se(VI) and Se(MIX), and it only had a noticeable influence on the Se speciation in roots, but not significant in shoots. Xray absorption spectroscopy allowed to identify organic Se as the main Se species formed in the shoots. The biostimulant has a mild effect on the Se speciation. Conclusion The biostimulant has a remarkable influence on both the uptake and accumulation of certain mineral nutrients and the plant metabolism by increasing the biomass under Se exposure. This indicates the potential of this biostimulant that also will prevent the possible Se-induced plant stress.
Responsible Editor: Jian Feng Ma. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04686-y) contains supplementary material, which is available to authorized users. T. Xiao : R. Boada : M. Valiente GTS-UAB Research Group, Department of Chemistry, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain C. Marini ALBA Synchrotron, Carrer de la llum 2-26, Cerdanyola del Vallès, 08290 Barcelona, Spain M. Llugany (*) Plant Physiology Group (BABVE), Facultat de Biociències, Universitat Autonòma de Barcelona, 08193 Bellaterra, Spain e-mail: [email protected]
Keywords Se speciation . Plant biostimulant . Auxins . XANES . Selenite . Selenate Abbreviations Deuterated IAA FA HPAs IAA IBA IPyA LCF NB No Se RA
Indole-2,4,5,6,7-d5–3-Acetic Acid Biostimulant Foliar Application Hybrid hetero-polyanions Indole-3-Acetic Acid Indole-3-Butyric Acid Indole-3-Pyruvic Acid Linear Combination Fitting No Biostimulant application No Selenium supply Biostimulant Root Application
Plant Soil
Se(IV) Se(VI) Se(MIX) SeMet SeCyst SeCys SeMeCys
Sele
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