Yield components and reproductive, physiological, and root traits used in early selection for nitrogen use efficiency in corn

Author(s)

Pinho Morais, Pedro Patric ^[1] ; Bandeira e Sousa, Massaine ^[2] ; Galli, Giovanni ^[2] ; Braatz e Andrade, Luciano Rogerio ^[1] ; Fritsche-Neto, Roberto ^[2] ; de Oliveira, Aluizio Borem ^[1]

Affiliation

^[1] Univ Fed Vicosa, Dept Biol Gera, Ave PH Rolfs S-N, Campus Univ, BR-36570900 Vicosa, MG - Brazil

^[2] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Genet, Ave Padua Dias 11, Caixa Postal 9, BR-13418900 Piracicaba, SP - Brazil

• Document type: Journal article
• Source: Pesquisa Agropecuária Brasileira; v. 53, n. 5, p. 620-632, MAY 2018.
• Web of Science Citations: 0

Abstract

Abstract: The objective of this work was to examine the possibility of using yield components and reproductive, physiological, and root traits in early selection for nitrogen use efficiency (NUE) in corn. Sixty-four inbred lines were evaluated under two nitrogen fertilization levels: ideal and low. The evaluations were performed at three phenological stages: eight fully-expanded leaves, tasseling stage, and physiological maturity. It is possible to select superior lines for NUE, but the yield components did not show differential behavior under the different nitrogen levels evaluated. Root, reproductive, and physiological traits are not promising for early selection of corn lines with high NUE. Likewise, the eight-leaves and tasseling stages were not promising for this purpose, since NUE should be estimated taking grain yield into account. However, indirect selection for NUE can be performed via number of ears or using the selection index considering number and weight of ears. (AU)

• FAPESP's process: 13/24135-2 - Genome-Wide Association Studies for nitrogen use efficiency and its components in tropical maize lines
• Grantee: Roberto Fritsche Neto
• Support Opportunities: Regular Research Grants