Influence of a plant biostimulant on the uptake, distribution and speciation of Se in Se-enriched wheat (Triticum aestivum L. cv. Pinzón)
Xiao, Tingting (Universitat Autònoma de Barcelona. Departament de Química)
Boada, Roberto (Universitat Autònoma de Barcelona. Departament de Química)
Marini, Carlo (Laboratori de Llum del Sincrotró ALBA)
Llugany i Ollé, Mercè (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Valiente Malmagro, Manuel (Universitat Autònoma de Barcelona. Departament de Química)

Fecha:	2020
Descripción:	15 pàg.
Resumen:	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. X-ray 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.
Ayudas:	Ministerio de Economía y Competitividad CTM2015-65414-C2-1-R European Commission 665919
Derechos:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Auxins ; Plant biostimulant ; Se speciation ; Selenate ; Selenite ; XANES
Publicado en:	Plant and soil, Vol. 455, Num. 1-2 (October 2020) , p. 409-423, ISSN 1573-5036

Adreça original del document, elimineu-la del registre: https://egreta.uab.cat/ws/files/518972861/s11104-020-04686-y.pdf
DOI: 10.1007/s11104-020-04686-y

Postprint 32 p, 2.0 MB

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