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Characterization of calcium foliar absorption and its translocation by tomato plants using strontium as a physiological tracer

Grant number: 22/10718-5
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): May 30, 2023
Effective date (End): May 29, 2024
Field of knowledge:Agronomical Sciences - Agronomy
Principal Investigator:José Lavres Junior
Grantee:Eduardo Santos
Supervisor: Chithra Karunakaran
Host Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Research place: Canadian Light Source, Canada  
Associated to the scholarship:20/11546-8 - Efficiency of foliar application of different sources of calcium in tomatoes: understanding and bypassing low phloem mobility, BP.DR


The poor efficiency of calcium-based foliar fertilization is mainly associated with the low Ca2+ mobility in the phloem of plants. Since most of the Ca reaches upper plants tissues through root-to-shoot uptake, its supply is strongly reduced as the xylem loses its functionality in sink regions, e.g., fruits, thereby inducing several Ca-related physiological disorders, such as blossom end-rot, as well as a significant reduction in productivity, quality, and shelf-life. Therefore, unravelling how Ca2+ is absorbed by leaves and exported towards fruits might be a useful strategy for developing more efficient fertilizers. In this scenario, the present proposal aims at employing microprobe X-ray fluorescence and absorption spectroscopy (XRF and XAS) to determine the absorption and translocation of Ca/Sr formulations applied to foliar tomato (Solanum lycopersicum L., cv. Micro-Tom). In this regard, we plan to employ the BioXAS Imaging beamline for mapping the Ca2+ and Sr2+ movements in leaves and petiole. It is important highlights, that strontium will be used as a physiological tracer for Ca2+. From a plant physiological standpoint, the generated results will contribute to understanding the limitations of Ca2+ transport through the xylem and enable the establishment of Ca formulations reaching the fruits more easily. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SANTOS, EDUARDO; MONTANHA, GABRIEL SGARBIERO; AGOSTINHO, LUIS FERNANDO; POLEZI, SAMIRA; MARQUES, JOAO PAULO RODRIGUES; DE CARVALHO, HUDSON WALLACE PEREIRA. Foliar Calcium Absorption by Tomato Plants: Comparing the Effects of Calcium Sources and Adjuvant Usage. PLANTS-BASEL, v. 12, n. 14, p. 15-pg., . (22/10718-5)

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