Selenium Biofortification of Vegetables Grown in Calcareous Soil: A Pot Experiment Using 77 Se as a Tracer.

Autor: Baset ABK; Department of Food Science and Quality Control, Technical College of Halabja, Sulaimani Polytechnic University, Sulaimani, Iraq., Hawrami KAM; Department of Medical Laboratory Techniques, Halabja Technical Institute, Sulaimani Polytechnic University, Sulaimani, Iraq. karzan.mohammed@spu.edu.iq., Bailey EH; Division of Agriculture and Environmental Science, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD, UK., Young SD; Division of Agriculture and Environmental Science, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD, UK.
Jazyk: angličtina
Zdroj: Biological trace element research [Biol Trace Elem Res] 2024 Dec 16. Date of Electronic Publication: 2024 Dec 16.
DOI: 10.1007/s12011-024-04483-z
Abstrakt: Dietary selenium (Se) is vital for human health and can be provided through consumption of Se-rich vegetables. Soil Se is often poorly available and so biofortification using Se-enriched fertilizers is used to enhance dietary intake. This study aimed to (a) evaluate the feasibility of biofortifying vegetables, commonly grown in the calcareous soils of Kurdistan, with a single application of Se (10 g ha -1 ) as selenate and, (b) trace the fate of applied Se using an enriched stable isotope, ⁷⁷Se. A randomized block pot experiment was conducted with five vegetable species: celery, chard, lettuce, radish, and spring onion. Soils were spiked with 2 µg ⁷⁷Se per pot, simulating 10 g ha -1 . Plants were harvested after 8 weeks, and both plant tissues and soils underwent sequential extraction and isotopic analysis to determine Se fractionation and source apportionment. Across all species, plant uptake of native soil Se (Se s ) exceeded that of fertilizer-derived Se (Se f ). Shoot concentrations of Se s ranged from 58.2 to 115 µg kg -1 , while ⁷⁷Se f concentrations varied between 10.5 and 46.9 µg kg -1 . Post-harvest soil analyses indicated immobilization of applied ⁷⁷Se: 55% transitioned to organically bound forms, 40% became recalcitrant, and only 5% remained in plant-available fractions. The study underscores the challenges of Se biofortification in calcareous soils, where interaction with CaCO 3 may reduce Se availability. Variations in Se uptake among vegetable species highlight the importance of application timing. To enhance biofortification efficacy for fast-growing leafy vegetables, mid-season or foliar Se applications are recommended to counteract rapid soil immobilization.
Competing Interests: Declarations. Competing Interests: The authors declare no competing interests.
(© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
Databáze: MEDLINE
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