Methods to classify maize cultivars in use efficiency and response to nitrogen

Revista Ceres

Cleiton Lacerda Godoy²  Glauco Vieira Miranda¹  Rodrigo Oliveira Delima²  Leandro Vagno De Souza¹  João Carlos Cardoso Galvão¹  Izabel Cristina Dos Santos¹ 

[1] ,Federal University of Viçosa Departament of Plant Science Viçosa Minas Gerais ,Brazil

关键词: regression;    responsive;    selection;    index;    Zea mays L;    regressão;    responsivo;    seleção;    índice;    Zea mays L;   

DOI  :  10.1590/S0034-737X2013000500014

来源: SciELO

【 摘 要 】

n plant breeding programs that aim to obtain cultivars with nitrogen (N) use efficiency, the focus is on methods of selection and experimental procedures that present low cost, fast response, high repeatability, and can be applied to a large number of cultivars. Thus, the objectives of this study were to classify maize cultivars regarding their use efficiency and response to N in a breeding program, and to validate the methodology with contrasting doses of the nutrient. The experimental design was a randomized block with the treatments arranged in a split-plot scheme with three replicates and five N doses (0, 30, 60, 120 and 200 kg ha-1) in the plots, and six cultivars in subplots. We compared a method examining the efficiency and response (ER) with two contrasting doses of N. After that, the analysis of variance, mean comparison and regression analysis were performed. In conclusion, the method of the use efficiency and response based on two N levels classifies the cultivars in the same way as the regression analysis, and it is appropriate in plant breeding routine. Thus, it is necessary to identify the levels of N required to discriminate maize cultivars in conditions of low and high N availability in plant breeding programs that aim to obtain efficient and responsive cultivars. Moreover, the analysis of the interaction genotype x environment at experiments with contrasting doses is always required, even when the interaction is not significant.

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