Accuracy of the simultaneous selection for stress tolerance and nitrogen use efficiency in maize tropical lines

• Grant number: 14/23635-4
• Support Opportunities: Scholarships in Brazil - Master
• Start date: March 01, 2015
• End date: February 29, 2016
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Roberto Fritsche Neto
• Grantee: Leandro de Freitas Mendonça
• Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

With the high demand for nitrogen (N) and maize planting migration to low fertility areas, there is the need to develop genotypes which have satisfactory yields in favorable and unfavorable nutritional conditions. Therefore, the objective is to assess the possibility to simultaneously select maize tropical lines that are nitrogen stress tolerant and nitrogen use efficient, and to check if there are differences among the statistical methods for simultaneous selection. In this context, 64 tropical maize lines will be evaluated in two locations and two nitrogen levels (high and low availability) for three plant stress response indexes: Nitrogen Agronomic Efficiency (NAE); Low Nitrogen Tolerance Index (LNTI); and Low Nitrogen Agronomic Efficiency (LNAE). The breeding values to the lines for these indexes will be predicted using mixed models equations, Restricted Maximum likelihood/Best Linear Unbiased Predictor (REML/BLUP) single-trait (univariate) and multi-trait (multivariate). Then, six methodologies for simultaneous selection to NAE and LNTI will be made, three methods of simultaneous selection (graphical analysis, additive selection index and Mulamba Mock index) and two breeding values predicted methods (REML/BLUP single-trait and multi-trait. In addition, the breeding value of LNAE will be used as a simultaneous selection method to nitrogen use efficiency and nitrogen stress tolerance. Finally, these seven methods will be compared for selection gain and accuracy. (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)

MENDONCA, LEANDRO DE FREITAS; CORREIA GRANATO, ITALO STEFANINE; ALVES, FILIPE COUTO; PINHO MORAIS, PEDRO PATRIC; VIDOTTI, MIRIAM SUZANE; FRITSCHE-NETO, ROBERTO. Accuracy and simultaneous selection gains for N-stress tolerance and N-use efficiency in maize tropical lines. Scientia Agricola, v. 74, n. 6, p. 481-488, NOV-DEC 2017. (14/23635-4)

MENDONCA, LEANDRO F.; FRITSCHE-NETO, ROBERTO; GRANATO, ITALO S. C.; ALVES, FILIPE C.. Accuracy and simultaneous selection gains for grain yield and earliness in tropical maize lines. MAYDICA, v. 61, n. 3, 2016. (14/23635-4)

MENDONCA, LEANDRO DE FREITAS; CORREIA GRANATO, ITALO STEFANINE; ALVES, FILIPE COUTO; PINHO MORAIS, PEDRO PATRIC; VIDOTTI, MIRIAM SUZANE; FRITSCHE-NETO, ROBERTO. Accuracy and simultaneous selection gains for N-stress tolerance and N-use efficiency in maize tropical lines. CIENTIA AGRICOL, v. 74, n. 6, p. 8-pg., 2017-11-01. (14/23635-4)

Academic Publications

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

MENDONÇA, Leandro de Freitas. Accuracy of simultaneous selection for interest traits in second growing season tropical maize. 2016. Master's Dissertation - Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) Piracicaba.