González Velázquez, Jomarys

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    Effect of hydrogen sulfide on cadmium and macro and micronutrients uptake by 𝘓𝘦𝘶𝘤𝘢𝘦𝘯𝘢 𝘭𝘦𝘶𝘤𝘰𝘤𝘦𝘱𝘩𝘢𝘭𝘢
    (2023-05-10) González Velázquez, Jomarys; López Moreno, Martha L.; College of Arts and Sciences - Sciences; Román Velázquez, Félix R.; Rivera Portalatín, Nilka; López Garriga, Juan; Department of Chemistry; Morales Payán, José P.
    Environmental contamination with Cadmium (Cd) is a great concern due to its hazardous effects on living organisms. Cd levels in agricultural soils are increasing because of industrial expansion and pesticide use. The aim of this research is to study the role of hydrogen sulphide (H2S) on the uptake of Cd by Leucaena Leucocephala to improve its metal tolerance for phytoremediation purposes. Different parameters were determined, including radicle length, plant growth, relative water content, chlorophyll, catalase production, Cd uptake, and macro/micronutrient content. Inductively Coupled Plasma Optical Emission Spectrometry (ICP/OES) was used to quantify Cd content and macro/micronutrients in plant tissues. L. Leucocephala plants exposed to different Cd concentrations did not show significant difference in Cd uptake in roots, but a significant increase in Cd content was observed in stems as Cd levels in the media increased. The highest Cd content (830 ± 20 mg/kg) was found in stems exposed to 15 mg/L Cd, and no Cd was detected in leaves. Data show that as Cd concentration increased in the media, Ca, Mg, K, Zn, and Mn decreased in roots. Moreover, while the presence of Cd reduced catalase activity in roots, chlorophyll production was not affected. On the other hand, plants exposed to different Ca concentrations show a significant difference in Cd uptake in root. Results showed that as Ca concentration increases in the media the uptake of Cd decrease, showing a reduction of 92% at 80 ppm of Ca in root. Results may agree with the hypothesis that Cd enters to plant cells through Ca channels. A significant difference in radicle length and chlorophyll was observed in plants exposed to 5ppm of Cd and different NaHS concentrations. Addition of NaHS to the media shows a significant increase in Cd uptake by roots as NaHS concentration in media increased. Maximum Cd uptake (7670 ± 102 mg/kg) was found in roots exposed to 100 μM of NaHS. A significant reduction in catalase activity was observed in root system due to Cd concentration inside plant tissues. Results suggested that NaHS helps decrease the toxic effect of Cd on the growth and development of plants.