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Agronomy 2018, 8(12), 309; https://doi.org/10.3390/agronomy8120309

Variability for Nitrogen Management in Genetically-Distant Maize (Zea mays L.) Lines: Impact of Post-Silking Nitrogen Limiting Conditions

1
Institut Jean-Pierre Bourgin, INRA, Agro-ParisTech, Université de Paris-Saclay, 78000 Versailles, France
2
Lancaster Environment Centre, Lancaster University, LA1 4YQ Lancaster, UK
*
Author to whom correspondence should be addressed.
Received: 25 October 2018 / Revised: 4 December 2018 / Accepted: 14 December 2018 / Published: 19 December 2018
(This article belongs to the Special Issue Environmental and Management Factor Contributions to Maize Yield)
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Abstract

The impact of nitrogen (N)-limiting conditions after silking on kernel yield (KY)-related traits and whole plant N management was investigated using fifteen maize lines representative of plant genetic diversity in Europe and America. A large level of genetic variability of these traits was observed in the different lines when post-silking fertilization of N was strongly reduced. Under such N-fertilization conditions, four different groups of lines were identified on the basis of KY and kernel N content. Although the pattern of N management, including N uptake and N use was variable in the four groups of lines, a number of them were able to maintain both a high yield and a high kernel N content by increasing shoot N remobilization. No obvious relationship between the genetic background of the lines and their mode of N management was found. When N was limiting after silking, N remobilization appeared to be a good predictive marker for identifying maize lines that were able to maintain a high yield and a high kernel N content irrespective of their female flowering date. The use of N remobilization as a trait to select maize genotypes adapted to low N input is discussed. View Full-Text
Keywords: genetic diversity; maize; nitrogen; remobilization; silking; uptake; 15N-labeling genetic diversity; maize; nitrogen; remobilization; silking; uptake; 15N-labeling
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Quilleré, I.; Dargel-Graffin, C.; Lea, P.J.; Hirel, B. Variability for Nitrogen Management in Genetically-Distant Maize (Zea mays L.) Lines: Impact of Post-Silking Nitrogen Limiting Conditions. Agronomy 2018, 8, 309.

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