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Glyphosate effects on growth, uptake and translocation of phosphorus in eucalyptus plants.

Grant number: 11/20705-3
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): February 01, 2013
Effective date (End): April 10, 2016
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Pedro Luis da Costa Aguiar Alves
Grantee:Fernanda Campos Mastrotti Pereira
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

Phosphorus is an essential element for plants, as a structural component of nucleic acids and phospholipids, is also essential for photosynthesis. The mobilization of phosphate within the plant is a complex process and dependent on numerous carriers for absorption and translocation. Glyphosate is a herbicide widely used in eucalyptus, and cite research that this herbicide can be conducted by a phosphate transporter. (DENIS & DELROT, 1993, MORIN et al, 1997; GODOY, 2007). The objective of this study is to evaluate the effect of glyphosate and phosphorus absorption and translocation in two clones of eucalyptus (Eucalyptus urograndis). Experiments will be conducted in an environment without protection (substrate) and in a growth chamber (hydroponics). The substrate treatments will consist of three doses of fertilization with phosphorus (1 / 2 X, X and 1/2X 1 mg. L-1 phosphorus, respectively, where x is the recommended dose) and eight doses of glyphosate (0 , 3.6, 7.2, 18, 36, 72, 180 and 360 g and ha-1). The experiment in hydroponics will keep phosphorus levels mentioned above, and the treatments with glyphosate will correspond to 0, 0.5, 2.5, 5.0, 25 and 50% of the dose of equivalent acid of glyphosate recommended for culture . At 0, 7, 14, 21, 28 and 35 days after herbicide application (DAA) will be evaluated height, stem diameter, the relative content of chlorophyll and the efficiency of photosystem II. At 0, 14 and 28 (DAA) will be assessed the rate of net photosynthesis and stomatal conductance. At 35 DAA plants eucalyptus will be cut and the leaf area measured. Roots, stems and leaves are separated to obtain the dry mass. After heavy, the material will be crushed and samples will be sent to determine the levels of macro and micronutrients. The data obtained in the evaluations will be submitted to analysis of variance by F test and for comparison of means will be used the Tukey test at 5% probability. Studies of absorption and translocation of glyphosate are made from suspensions of cultured cells from the two clones of Eucalyptus urograndis previously studied.

Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
PEREIRA, Fernanda Campos Mastrotti. Efeitos do glyphosate e do fósforo em eucalipto. 2016. Doctoral Thesis - Universidade Estadual Paulista "Júlio de Mesquita Filho" Faculdade de Ciências Agrárias e Veterinárias..

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