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

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


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)

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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 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, . (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.

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