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Open AccessArticle

Genetic Diversity, Population Structure and Inter-Trait Relationships of Combined Heat and Drought Tolerant Early-Maturing Maize Inbred Lines from West and Central Africa

1
West Africa Center for Crop Improvement (WACCI), University of Ghana, PMB 30 Legon, Accra, Ghana
2
International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan 200001, Nigeria
3
CSIR-Crops Research Institute, Ghana. P.O. Box 3785, 039-5028 Kumasi, Ghana
4
Excellence in Breeding (EiB) Platform, International Maize and Wheat Improvement Centre (CIMMYT), ICRAF, PO Box 1041, 00621 Nairobi, Kenya
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(9), 1324; https://doi.org/10.3390/agronomy10091324
Received: 18 July 2020 / Revised: 22 August 2020 / Accepted: 28 August 2020 / Published: 4 September 2020
(This article belongs to the Special Issue Analysis of Crop Genetic and Germplasm Diversity)
Adequate knowledge and understanding of the genetic diversity and inter-trait relationships among elite maize inbred lines are crucial for determining breeding strategies and predicting hybrid performance. The objectives of this study were to investigate the genetic diversity of 162 early maturing white and yellow tropical maize inbred lines, and to determine the population structure, heterotic groups and inter-trait relationships among the lines. Using 9684 DArT single nucleotide polymorphism (SNP) markers, a gene diversity (GD) of 0.30 was recorded for the inbred lines with polymorphic information content (PIC) ranging from 0.08 to 0.38. The genetic relatedness among the inbred lines evaluated revealed six different groups based on the history of selection, colour of endosperm and pedigree. The genotype-by-trait (GT) biplot analysis identified inbred 1 (TZEI 935) as outstanding in terms of combined heat and drought (HD) tolerance with the base index analysis identifying 15 superior inbreds in the HD environment. A wide range of genetic variability was observed among the inbred lines, indicating that they are an invaluable resource for breeding for HD tolerance in maize breeding programmes, especially in West and Central Africa. View Full-Text
Keywords: genetic diversity; DArT SNP markers; maize; early maturity; heat and drought tolerance genetic diversity; DArT SNP markers; maize; early maturity; heat and drought tolerance
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MDPI and ACS Style

Osuman, A.S.; Badu-Apraku, B.; Ifie, B.E.; Tongoona, P.; Obeng-Bio, E.; Garcia-Oliveira, A.L. Genetic Diversity, Population Structure and Inter-Trait Relationships of Combined Heat and Drought Tolerant Early-Maturing Maize Inbred Lines from West and Central Africa. Agronomy 2020, 10, 1324. https://doi.org/10.3390/agronomy10091324

AMA Style

Osuman AS, Badu-Apraku B, Ifie BE, Tongoona P, Obeng-Bio E, Garcia-Oliveira AL. Genetic Diversity, Population Structure and Inter-Trait Relationships of Combined Heat and Drought Tolerant Early-Maturing Maize Inbred Lines from West and Central Africa. Agronomy. 2020; 10(9):1324. https://doi.org/10.3390/agronomy10091324

Chicago/Turabian Style

Osuman, Alimatu S.; Badu-Apraku, Baffour; Ifie, Beatrice E.; Tongoona, Pangirayi; Obeng-Bio, Ebenezer; Garcia-Oliveira, Ana L. 2020. "Genetic Diversity, Population Structure and Inter-Trait Relationships of Combined Heat and Drought Tolerant Early-Maturing Maize Inbred Lines from West and Central Africa" Agronomy 10, no. 9: 1324. https://doi.org/10.3390/agronomy10091324

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