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eISSN: 2083-5906
ISSN: 1230-1485
ISSN: 1230-1485
ORIGINAL RESEARCH
Elemental Composition of Xanthosoma sagittifolium
in the Amazon: Nutritional Value and Potential as
an Environmental Bioindicator in the Context
of Amazonian Edaphic Variability
1
Faculdade de Ciências Agrárias, Universidade Federal do Amazonas, Av. Rodrigo Otávio, 3000,
Manaus 69060-000, AM, Brasil
2
Embrapa Amazônia Ocidental, rod. AM 10, Km 29, s/n, CP 319, Manaus 69010-970, AM, Brasil
3
Instituto Federal do Amazonas, Av. da Onça-Pintada, S/N-Galo da Serra,
Presidente Figueiredo 69735-000, AM, Brasil
4
Instituto de Ciências Exatas e Tecnologia, Universidade Federal do Amazonas, rua Nossa Senhora do Rosário,
3863, Itacoatiara 69103-128, AM, Brasil
Submission date: 2025-10-07
Final revision date: 2025-11-12
Acceptance date: 2025-11-30
Online publication date: 2026-03-04
Corresponding author
Jennifer Souza Tomaz
Faculdade de Ciências Agrárias, Universidade Federal do Amazonas, Av. Rodrigo Otávio, 3000, Manaus 69060-000, AM, Brasil
Faculdade de Ciências Agrárias, Universidade Federal do Amazonas, Av. Rodrigo Otávio, 3000, Manaus 69060-000, AM, Brasil
KEYWORDS
TOPICS
ABSTRACT
Xanthosoma sagittifolium (taioba) is an unconventional food plant of nutritional and socioenvironmental
relevance. This study evaluated its elemental composition in five municipalities of
Amazonas (Manaus, Itacoatiara, Novo Airão, Humaitá, and Tabatinga) to analyze its nutritional potential
and use as an environmental bioindicator in the context of Amazonian edaphic variability. Rhizospheric
soil and leaf samples were analyzed by total reflection X-ray fluorescence (TXRF). The results
showed geochemical heterogeneity between the localities: soils of Tabatinga and Humaitá presented
high concentrations of aluminum and iron, while the leaves revealed higher levels of phosphorus,
potassium, calcium, and sulfur, especially in floodplain environments and seasonally flooded soils.
The analysis of main components (PCA) showed clear separation between municipalities, confirming
the edaphic influence on the mineral composition of the species. Positive correlations between nutrients
(P, S, Si, K) and trace elements (Cr, Yb) indicated physiological adaptive mechanisms of absorption.
The findings reinforce the dual role of taioba as both a food resource with high nutritional value and as
a bio-indicator sensitive to environmental quality. However, the presence of traces of potentially toxic elements highlights the need for continuous monitoring to ensure the safety of human consumption and
to broaden understanding of taioba in Amazonian ecosystems.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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| ISSN: | 1230-1485 |
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