رسالة جامعية
Gibberellic acid (GA3) and indole-3-acetic acid (IAA) role on Cd2+ and Cd-QDs uptake by 𝘓𝘦𝘶𝘤𝘢𝘦𝘯𝘢 𝘭𝘦𝘶𝘤𝘰𝘤𝘦𝘱𝘩𝘢𝘭𝘢
| العنوان: | Gibberellic acid (GA3) and indole-3-acetic acid (IAA) role on Cd2+ and Cd-QDs uptake by 𝘓𝘦𝘶𝘤𝘢𝘦𝘯𝘢 𝘭𝘦𝘶𝘤𝘰𝘤𝘦𝘱𝘩𝘢𝘭𝘢 |
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| المؤلفون: | Salas Vázquez, Efraín |
| المساهمون: | López Moreno, Martha L., College of Arts and Sciences - Sciences, Román Velázquez, Félix R., Vega Olivencia, Carmen A., Santana Vargas, Alberto, Department of Chemistry, Alfaro, Mónica |
| سنة النشر: | 2022 |
| المجموعة: | Digital Institutional Repository @UPR (University of Puerto Rico - DiRe.UPR) |
| مصطلحات موضوعية: | Leucaena leucoceohala, Phytohormones, Cadmium, Quantum dots, Plants, Leucaena, Plant hormones, Leucaena - Effect of cadmium on, Plants - Effect of cadmium on |
| الوصف: | At present, there is no regulations for NMs disposal and living organisms are in contact day-to-day to these new small materials. Despite the benefits of nanotechnology, there are issues about the safety and toxicity of NMs that researchers are interested to address. The aim of this research is to compare Cd uptake from Cd2+ and Cd-QDs sources by Leucaena leucocephala plants, as well as to study the effect of exogenous phytohormones on Cd absorption. In this research, a capping agent thioglycolic acid (TGA) was used for the stabilization of QDs avoiding aggregation. HRTEM image for TGA-capped CdS-QDs showed a spherical morphology with a face-centered cubic structure. XRD patterns confirmed 5 nm QDs crystalline structure according to their characteristic planes. FTIR confirmed the functionalization of QDs with TGA. ICP - OES was used for Cd quantification and to evaluate macro/micronutrients content in L. leucocephala tissues. Physical and chemical parameters analyzed show the effect of Cd speciation inside plants as well as water deficit stress in leaves from plants exposed to 5 ppm Cd2+ (82 ± 3 %). Root elongation decreased 35% in plants exposed to Cd2+ + IAA compared to control group. Total dry weight was lower in plants exposed to Cd2+ (29%) compared to controls. A significant increase in Cd uptake by roots in presence of QDs (1.0 ± 0.4 mg/g) was observed compared with Cd2+ uptake (0.15 ± 0.02 mg/g). A decrease on the uptake of Zn, Mg, K, and Fe in roots was observed in plants exposed to Cd2+, but no significant difference was observed in Mg, Ca, and Fe content in roots of plants exposed to QDs treatment. Catalase (CAT) activity in plant leaves exposed to Cd2+ and phytohormones show an average increase of 97% compared to controls. However, CAT in roots exposed to Cd2+ decreased 84% compared to controls. CAT activity in plant roots exposed to QDs + IAA increased 195% and 50% in leaves of plants exposed to Cd-QDs + GA3 + IAA. This study will contribute to a better understanding about the effect of the metal ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| وصف الملف: | application/pdf |
| اللغة: | English |
| العلاقة: | https://hdl.handle.net/20.500.11801/2981Test |
| الإتاحة: | https://doi.org/20.500.11801/2981Test https://hdl.handle.net/20.500.11801/2981Test |
| حقوق: | (c) 2022 Efraín Salas Vázquez |
| رقم الانضمام: | edsbas.402AD28D |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |