رسالة جامعية
Integrated approach of anatomical, physiological and biochemical parameters for the study of tolerance mechanisms to cadmium in tomato accessions ; Abordagem integrada de parâmetros anatômicos, fisiológicos e bioquímicos para o estudo de mecanismos de tolerância ao cádmio em acessos de tomateiro
| العنوان: | Integrated approach of anatomical, physiological and biochemical parameters for the study of tolerance mechanisms to cadmium in tomato accessions ; Abordagem integrada de parâmetros anatômicos, fisiológicos e bioquímicos para o estudo de mecanismos de tolerância ao cádmio em acessos de tomateiro |
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| المؤلفون: | Carvalho, Marcia Eugenia Amaral de |
| المساهمون: | Azevedo, Ricardo Antunes de |
| بيانات النشر: | Biblioteca Digital de Teses e Dissertações da USP Universidade de São Paulo Escola Superior de Agricultura Luiz de Queiroz |
| سنة النشر: | 2017 |
| المجموعة: | University of São Paulo: Digital Library of Theses and Dissertations / Biblioteca Digital de Teses e Dissertações da USP |
| مصطلحات موضوعية: | Metais pesados, Solanum lycopersicum, Efeitos transgeracionais, Estresse oxidativo, Segurança alimentar, Remobilização de nutrientes, Oxidative stress, Nutrient remobilization, Heavy metals, Food security, Transgenerational effects |
| الوصف: | Tomato (Solanum lycopersicum L.) consumption has increased every year due to the fruit attractiveness, several utilizations, and beneficial effects for human health. However, tomato fruits can accumulate a Cd concentration that exceeds the safety threshold for human consumption of vegetables, even when plants are grown in soil with acceptable Cd level. Cd is a non-essential, hazardous element to biological systems, triggering several diseases in humans. In plants, Cd disturbs the antioxidant machinery, changes the nutritional status, and impairs the photoassimilate production and/or partitioning, hence reducing fruit yield and quality. However, distinct tomato accessions can present contrasting tolerance degree to Cd toxicity, as detected by our group in previous studies. The use of these accessions is a powerful approach to identify strategies employed by plants to cope with Cdinduced challenges, and the acknowledgement of such strategies can be potentially used in breeding and biotechnological programs to improve fruit yield and quality in crops that were cultivated in contaminated fields. The set of studies that compose the present thesis aimed (i) to identify the main mechanisms for the contrasting tolerance degree to Cd-induced toxicity in tomato accessions after short and long-term Cd exposure; (ii) to evaluate the relationship among tolerance degree and fruits attributes in plants that were grown in Cd-containing soil, and (iii) to determine the transgenerational effects of Cd-induced stress. In the first experiment, nine tomato accessions with a varied tolerance degree, which was based on biomass accumulation, to Cd exposure were grown in hydroponic solution containing CdCl2 35 μM for 6 days. Avoidance of high Mg concentration in roots was identified as a plant strategy to mitigate Cd toxicity by preventing formation of root hairs. Regarding the mode of action of Cd toxicity, Mn excess in leaves, in addition to the high Cd concentration per se, seems to be coupled to leaf damages that are enhanced by the ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| وصف الملف: | application/pdf |
| اللغة: | English |
| العلاقة: | http://www.teses.usp.br/teses/disponiveis/11/11137/tde-09102017-172803Test/ |
| DOI: | 10.11606/T.11.2017.tde-09102017-172803 |
| الإتاحة: | https://doi.org/10.11606/T.11.2017.tde-09102017-172803Test http://www.teses.usp.br/teses/disponiveis/11/11137/tde-09102017-172803Test/ |
| حقوق: | Liberar o conteúdo para acesso público. |
| رقم الانضمام: | edsbas.C33100CC |
| قاعدة البيانات: | BASE |
| DOI: | 10.11606/T.11.2017.tde-09102017-172803 |
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