Abstract

CHICO-RUIZ, Julio et al. Excess copper inhibits the growth of Bidens pilosa under laboratory conditions. Rev. Inv. Cs. Agro. y Vet. [online]. 2022, vol.6, n.16, pp.166-177.  Epub May 30, 2022. ISSN 2664-0902.  https://doi.org/10.33996/revistaalfa.v6i16.159.

Plant species can present toxicity problems due to the excess of mineral salts present in the soil, especially micronutrients, which cause alterations in their growth and development. Asteraceae, such as Bidens pilosa, tolerate high levels of heavy metals compared to other taxonomic groups, for this reason, the effect of excess copper on their growth and how it relates to their translocation index was investigated. For this, the seedlings were exposed to different concentrations of copper and their growth and storage in leaves and roots were evaluated. Three treatments were used (T1: 0 uM, T2: 50 uM and T3: 100 uM) with three repetitions per treatment and conditioned in a hydroponic system to which the modified Hoagland nutrient medium was added, diluted to a third of its normal concentration. The results show that when the copper concentrations increase, there is inhibition in the length of the stem and root and also a decrease in the fresh weight and dry weight; however, the number of leaves remains constant. In addition, mild chlorosis and necrosis were observed for T2 and T3, and the root is the organ that has the highest concentration of copper in T3. The extraction coefficient and the relative production index decrease, but the Translocation Index (TI) increases as the copper concentration increases. It is concluded that a higher concentration of copper inhibits the growth of the plant species, but increases IT.

Keywords : Plant growth; Bidens pilosa; copper; toxicity; micronutrient.

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