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Accumulation and localization of manganese in eucalypt species under low phosphorus availability

Grant number: 19/10243-4
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): November 01, 2019
Effective date (End): July 31, 2023
Field of knowledge:Biological Sciences - Botany - Pant Physiology
Principal Investigator:Paulo Mazzafera
Grantee:Vinícius Henrique de Oliveira
Host Institution: Instituto de Biologia (IB). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:16/25498-0 - Phosphorus use efficiency in Eucalyptus and the physiological and genetic mechanisms involved, AP.TEM


Eucalypts is a group of species with great economic importance. However their development can be limited due to the low phosphorus (P) availability in tropical soils. Contrarily, manganese (Mn) is a highly available micronutrient in such soil types, and can cause phytotoxicity when in excess. Eucalypt species capable of mobilizing P in soils via exudation of organic acids into the rhizosphere are vulnerable to Mn toxicity, or able to accumulate high concentrations of this metal, suggesting a remediation potential. Due to the lack of studies involving the interactions between Mn and P, or Mn tolerance, accumulation, its form and localization in eucalypts, we propose with this project to clarify some of these questions in species with differential abilities in P acquisition from soils (E. tereticornis, E. grandis and E. acmenoides). Plants will be evaluated under three Mn concentrations (sufficient, high and very high) and two P concentrations (deficient and sufficient), with or without inoculation with mycorrhizal fungus Rhizophagus irregularis, an association closely involved in modulating P and Mn uptake. The localization, concentration and speciation of Mn and P in different plant organs will be assessed by high resolution techniques, such as: ICP-OES, LIBS and µ-XRF with synchrotron radiation (uncertain due to possible cuts in federal funding), and determination of expression of genes encoding Mn and P transporters in roots (Nramp1, Nramp3, YSL2, ZIP2 and RiPT5), by RT-qPCR. The results from all these analyses will be associated with results from several physiological analyses. (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)
DE OLIVEIRA, VINICIUS H.; MAZZAFERA, PAULO; DE ANDRADE, SARA ADRIAN LOPEZ. Alleviation of low phosphorus stress in Eucalyptus grandis by arbuscular mycorrhizal symbiosis and excess Mn. PLANT STRESS, v. 5, p. 12-pg., . (19/10243-4, 16/25498-0)

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