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Ecophysiological Responses of Copaifera langsdorffii Grown in Mining Tailings Under Lower Water Availability

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Abstract

The objective of this work was to test the effect of water limitation on Copaifera langsdorffii Desf. cultivated in mining tailings from the dam rupture in Mariana City, Brazil. Plants were grown in the mining tailing and under two conditions: field capacity (FC) and 50% FC for 60 days. The effects of water restriction on growth, gas exchange, water potential, and leaf anatomy of C. langsdorffii were evaluated. The experimental design was completely randomized with two treatments and 15 replicates, and data was submitted to one-way ANOVA to p < 0.05. Mining tailings showed adequate nutrient levels and the presence of Al, Cd, Pb, and Cr as well as very small particles of 1.19 μm in diameter. The reduction in water availability promoted no changes in the shoot fresh weight, however, increased this parameter for the roots. In addition, water limitation increased plant investment in the root system while reduced biomass allocation to shoots. Lower water levels also increased the root length, number of leaves, and leaf area. However, both water potential and content were not changed by reduced water availability. Lower water levels also increased gas exchange parameters and chlorophyll content. In addition, 50% FC increased the stomatal length/width ratio and their size though no effect in stomatal density was found. Thus, Copaifera langsdorffii grows and thrives in mining tailings even under reduced water availability up to 50% FC showing potential for reforestation systems.

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Funding

The authors received funding and research grants from CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Counsel of Technological and Scientific Development)), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brazil (CAPES) - Finance Code 001, and FAPEMIG (Fundação de Amparo à Pesquisa do estado de Minas Gerais (Minas Gerais State Research Foundation)) to complete the present study.

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Correspondence to Fabricio José Pereira.

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de Pádua, M.P., Caetano, A.L., Polo, M. et al. Ecophysiological Responses of Copaifera langsdorffii Grown in Mining Tailings Under Lower Water Availability. Water Air Soil Pollut 232, 57 (2021). https://doi.org/10.1007/s11270-021-05037-y

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  • DOI: https://doi.org/10.1007/s11270-021-05037-y

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