Cytogenomics of accessions of Paspalum virgatum and its correlation with the effectiveness of herbicides control

• Grant number: 19/06378-1
• Support type: Scholarships abroad - Research Internship - Doctorate
• Effective date (Start): July 01, 2019
• Effective date (End): March 26, 2020
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Pedro Luis da Costa Aguiar Alves
• Grantee: Renata Thaysa da Silva Santos
• Supervisor abroad: Esteban Fernando Rios
• Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
• Local de pesquisa : University of Florida, Gainesville (UF), United States
• Associated to the scholarship: 18/06172-1 - Characterization of accessions of Paspalum virgatum and its correlation with the effectiveness of herbicides control, BP.DR

Abstract

The characterization of the access of Paspalum virgatum (razor-blade grass) will allow to highlight the genetic peculiarities that can interfere in the control efficiency of this species, considered in several places of the world as a plant difficult to control, and thus to provide information that can help in the elaboration of management strategies. Therefore, the objective of this work is to characterize the access of razor grass from the United States and to correlate the genetic study with the effectiveness of herbicides for the post-emergence control of the plants. The experiments will be conducted in partnership with the University of Florida. The genetic study will be conducted in the laboratory of the Department of Agronomy (IFAS) under the supervision of PhD. Esteban Rios, located in Gainesville, Florida. The control efficacy experiment of Paspalum spp. will be conducted at the University of Florida Experimental Station, under the supervision of PhD. Brent Sellers, located in Ona, Florida. For the genetic study, the seeds of razor grass (Paspalum virgatum) will come from the U.S. National Plant Germplasm System. A chromosome study (karyotyping) and flow cytometry will be performed to evaluate the level of ploidy and estimation of genome size. The effectiveness of access control by the herbicides imazapic, nicosulfuron and glyphosate at the dosages recommended by the manufacturer will be evaluated, with a control without application. At 7, 14, 21 and 28 days after the application will be made visual evaluations of intoxication of plants, according to EWRC (1964) and biometrics. Data from genetic studies and control efficacy will be submitted to multivariate analysis.