Effects of relative humidity air and the amino acids glutamate and histidine on the translocation of manganese and zinc applied via foliar in soybean (Glycine max L.) and coffee (Coffea arabica L.) crops.

• Ano de defesa: 2024
• Autor(a) principal: Rezende, Vinicius Pires
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Amino acids; Aminoácidos; Café; Coffee; Soja; Soybean; XRF
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/64/64134/tde-30042025-094425/

Manganese (Mn) and zinc (Zn) are essential micronutrients for plant growth, but their deficiencies are widespread and significantly reduce crop yields worldwide. Recently, the combination of amino acids and mineral nutrients has been explored as a strategy to increase the efficiency of foliar-based micronutrient fertilization in weathered tropical soils. However, systematic studies supporting these arguments are scarce. Based on this, the study hypothesizes that amino acids can induce the transport of foliar-applied micronutrients to other plant parts. This dissertation provides a comprehensive overview of foliar fertilization with Zn and Mn through a quantitative metadata analysis of 162 peer-reviewed articles published between 2012 and 2023, revealing that the most used sources of Zn and Mn were sulfate salts and commercial formulations. Despite variations in experimental conditions and inconsistency in the description of relative humidity, most studies reported positive effects of foliar applications of Mn and Zn on plant parameters, highlighting their potential to increase agricultural productivity. Furthermore, this research used in vivo X-ray fluorescence spectroscopy to investigate the short- and long-range transport of Mn and Zn complexed with histidine and glutamic acid under different relative humidity conditions, compared to sulfate-based sources. The results showed that Histidine:Mn:Zn and Glutamate:Mn:Zn complexes exhibited better transport performance compared to conventional sources at high (70-86%) and low (35-45%) relative humidity. Additionally, these complexes mitigated Mn and Zn-induced phytotoxicity in soybean leaves. These findings highlight the potential of amino acid complexes to optimize micronutrient supply in soybean and coffee crops, promoting better growth and development. Future research should focus on the mechanisms of nutrient uptake facilitated by amino acids and the practical applications of these complexes in various agricultural environments, with significant implications for increasing productivity and sustainability in the cultivation of various crops.