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Plant Metal Hyperaccumulation in Mexico : Agromining Perspectives

Abstract : Agromining technology involves the recovery of strategic metals from metalliferous soils through the cultivation of metal(loid) hyperaccumulator plants. The impetus of this research was to evaluate the potential of Mexican plant resources for the future development of agromining. The main objectives were then to identify and to study some metal hyperaccumulator plant species in Mexico, and to assess the agronomy of one promising “metal crop” for agromining. We first undertook field explorations in three nickel-rich ultramafic regions of central and southern Mexico. Despite the availability of soil and climatic conditions, no nickel (Ni) hyperaccumulation was found in any of these regions. A second strategy based on plant phylogeny as a prediction tool for metal hyperaccumulation was followed. In total, ten plant metal hyperaccumulator species were identified during this research (Rubiaceae and Violaceae) in Ni-enriched soils influenced by volcanic activity in Southeastern Mexico; most of them were priorly unknown. Our studies revealed two of the strongest hypernickelophores reported so far (>4%wt Ni) and two new Ni hyperaccumulator genera (Orthion and Mayanaea). Special focus was given to the hypernickelophore tree Blepharidium guatemalense. The phloem on leaves, roots, stems and petioles of this plant are the richest in Ni suggesting an unusual re-distribution mechanism via the phloem. Different agronomic practices were tested for this plant. Synthetic fertilization strongly increased nickel uptake without any change in plant growth or biomass, whereas organic fertilization enhanced plant shoot biomass with a negligible effect on foliar Ni concentrations. A 5-year-old stand which was subsequently harvested twice per year produced the maximum Ni yield tree⁻¹ yr⁻¹, with an estimated total nickel yield of 142 kg ha⁻¹ yr⁻¹. Blepharidium guatemalense is a prime candidate for Ni agromining on the account of its valuable traits: extremely efficient Ni uptake, high biomass production, fast growth rate, and easy to reproduce.
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https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2020_0187_NAVARRETE_GUTIERREZ.pdf
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https://hal.univ-lorraine.fr/tel-03176611
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Submitted on : Monday, March 22, 2021 - 3:20:55 PM
Last modification on : Monday, March 29, 2021 - 2:43:12 PM

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  • HAL Id : tel-03176611, version 1

Citation

Dulce Montserrat Navarrete Gutiérrez. Plant Metal Hyperaccumulation in Mexico : Agromining Perspectives. Environmental Sciences. Université de Lorraine; Universidad autónoma de Chapingo (Mexique), 2020. English. ⟨NNT : 2020LORR0187⟩. ⟨tel-03176611⟩

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