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Genetic Dissection of Grain Yield and Agronomic Traits in Maize under Optimum and Low-Nitrogen Stressed Environments

Ethiopian Institute of Agricultural Research, Bako National Maize Research Center, P.O. Box 2003, Addis Ababa, Ethiopia
Department of Plant Sciences, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa
International Maize and Wheat Improvement Center (CIMMYT), P.O. Box 1041, Nairobi 00621, Kenya
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(2), 543;
Received: 7 November 2019 / Revised: 5 December 2019 / Accepted: 13 December 2019 / Published: 15 January 2020
(This article belongs to the Section Molecular Genetics and Genomics)
Understanding the genetic basis of maize grain yield and other traits under low-nitrogen (N) stressed environments could improve selection efficiency. In this study, five doubled haploid (DH) populations were evaluated under optimum and N-stressed conditions, during the main rainy season and off-season in Kenya and Rwanda, from 2014 to 2015. Identifying the genomic regions associated with grain yield (GY), anthesis date (AD), anthesis-silking interval (ASI), plant height (PH), ear height (EH), ear position (EPO), and leaf senescence (SEN) under optimum and N-stressed environments could facilitate the use of marker-assisted selection to develop N-use-efficient maize varieties. DH lines were genotyped with genotyping by sequencing. A total of 13, 43, 13, 25, 30, 21, and 10 QTL were identified for GY, AD ASI, PH, EH, EPO, and SEN, respectively. For GY, PH, EH, and SEN, the highest number of QTL was found under low-N environments. No common QTL between optimum and low-N stressed conditions were identified for GY and ASI. For secondary traits, there were some common QTL for optimum and low-N conditions. Most QTL conferring tolerance to N stress was on a different chromosome position under optimum conditions. View Full-Text
Keywords: low nitrogen; maize, marker assisted selection; QTL low nitrogen; maize, marker assisted selection; QTL
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Tadesse Ertiro, B.; Olsen, M.; Das, B.; Gowda, M.; Labuschagne, M. Genetic Dissection of Grain Yield and Agronomic Traits in Maize under Optimum and Low-Nitrogen Stressed Environments. Int. J. Mol. Sci. 2020, 21, 543.

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