Integrated effects of K and Na application on initial growth of eucalyptus seedlings submitted to water stress: water use efficiency, gas exchange and ´13C isotopic variation

• Grant number: 17/24410-4
• Support Opportunities: Scholarships in Brazil - Master
• Start date: July 01, 2018
• End date: July 31, 2019
• Field of knowledge: Agronomical Sciences - Forestry Resources and Forestry Engineering - Forestry
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: José Lavres Junior
• Grantee: Nikolas de Souza Mateus
• Host Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

In Brazil, fertilizer application is one of the main factors for achieving high productivity in commercial Eucalyptus plantations, since it is frequently carried out in soils with water stress and low chemical fertility. Potassium (K) is the most required macronutrient by the Eucalyptus plant, while sodium (Na), can partially substitute some physiologic functions of K, influencing directly the water use efficiency (WUE) of plants. Thus, the present study aims to evaluate, in a greenhouse, the response of four contrasting eucalypt clones regarding to water stress tolerance to the partial replacement of K by Na in different water regimes. Plant growth, nutrient concentration, gas exchange (A-CO2 assimilation rate, gs-stomatal conductance, E-transpiration and A/ci-RUBISCO carboxylation efficiency), WUE, chlorohpyl and polyamines content, stomatal density (DE), leaf water potential (¨w), leaf area (AF) and isotopic carbon fractionation (´13C) will be measured. It is expected that the different clones respond positively to the partial substitution of K by Na, with an increase in the efficiency of CO2 assimilation and in the initial growth of eucalyptus and that drought-tolerant clones have smaller reduction in growth compared to sensible clones, as well as greater efficiency of absorption and utilization of K and Na. (AU)

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)

MATEUS, NIKOLAS SOUZA; FLORENTINO, ANTONIO LEITE; OLIVEIRA, JESSICA BEZERRA; SANTOS, ELCIO FERREIRA; GAZIOLA, SALETE APARECIDA; ROSSI, MONICA LANZONI; LINHARES, FRANCISCO SCAGLIA; BENDASSOLLI, JOSE ALBERTINO; AZEVEDO, RICARDO ANTUNES; LAVRES, JOSE. Leaf C-13 and N-15 composition shedding light on easing drought stress through partial K substitution by Na in eucalyptus species. SCIENTIFIC REPORTS, v. 11, n. 1, OCT 11 2021. (17/24410-4)

MATEUS, NIKOLAS DE SOUZA; LEITE, ANTONIO FLORENTINO; SANTOS, ELCIO FERREIRA; FERRAZ, ALEXANDRE DE VICENTE; GONCALVES, JOSE LEONARDO DE MORAES; LAVRES, JOSE. Partial Substitution of K by Na Alleviates Drought Stress and Increases Water Use Efficiency in Eucalyptus Species Seedlings. FRONTIERS IN PLANT SCIENCE, v. 12, MAR 15 2021. (17/24410-4)

MATEUS, NIKOLAS SOUZA; FLORENTINO, ANTONIO LEITE; OLIVEIRA, JESSICA BEZERRA; SANTOS, ELCIO FERREIRA; GAZIOLA, SALETE APARECIDA; ROSSI, MONICA LANZONI; LINHARES, FRANCISCO SCAGLIA; BENDASSOLLI, JOSE ALBERTINO; AZEVEDO, RICARDO ANTUNES; LAVRES, JOSE. Leaf C-13 and N-15 composition shedding light on easing drought stress through partial K substitution by Na in eucalyptus species (vol 11, 20158, 2021). SCIENTIFIC REPORTS, v. 12, n. 1, p. 1-pg., 2022-05-20. (17/24410-4, 19/16168-4)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

MATEUS, Nikolas de Souza. Integrated effects of K and Na application on initial growth of eucalyptus seedlings submitted to water stress: water use efficiency, leaf gas exchange and 13C isotopic variation. 2019. Master's Dissertation - Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura (CENA/STB) Piracicaba.