Effect of trinexapac-ethyl in eucalyptus primary metabolism and hormonal balance u...
| Grant number: | 17/24410-4 |
| Support type: | Scholarships in Brazil - Master |
| Effective date (Start): | July 01, 2018 |
| Effective date (End): | July 31, 2019 |
| Field of knowledge: | Agronomical Sciences - Forestry Resources and Forestry Engineering |
| Cooperation agreement: | Coordination of Improvement of Higher Education Personnel (CAPES) |
| Principal Investigator: | José Lavres Junior |
| Grantee: | Nikolas de Souza Mateus |
| Home 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) | |