Relative importance of gene effects for nitrogen-use efficiency in popcorn.
2020
SANTOS, A. | AMARAL JÚNIOR, A. T. do | FRITSCHE-NETO, R. | KAMPHORST, S. H. | FERREIRA, F. R. | AMARAL, J. F. T. do | VIVAS, J. M. S. | SANTOS, P. H. A. D. | LIMA V. J. de | KHAN, S. | SCHMITT, K. F. M. | LEITE, J. T. | SANTOS JUNIOR, D. R. dos | BISPO, R. B. | SANTOS, T. de O. | OLIVEIRA, U. A. de | GUIMARAES, L. J. M. | RODRIGUEZ, O.
The objective of this study was to evaluate the effects of additive and non-additive genes on the efficiency of nitrogen (N) use and N responsiveness in inbred popcorn lines. The parents, hybrids and reciprocal crosses were evaluated in a 10x10 triple lattice design at two sites and two levels of N availability. To establish different N levels in the two experiments, fertilization was carried out at sowing, according to soil analysis reports. However, for the experiments with ideal nitrogen availability, N was sidedressed according to the crop requirement, whereas for the N-poor experiments sidedressing consisted of 30% of that applied in the N-rich environment. Two indices were evaluated, the Harmonic Mean of the Relative Performance (HMRP) and Agronomic Efficiency under Low Nitrogen Availability (AELN), both based on grain yield at both N levels. Both additive and non-additive gene effects were important for selection for N-use efficiency. Moreover, there was allelic complementarity between the lines and a reciprocal effect for N-use efficiency, indicating the importance of the choice of the parents used as male or female. The best hybrids were obtained from inbred popcorn lines with contrasting N-use efficiency and N responsiveness.
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