Screening of early and extra-early maize inbreds under artificial turcicum infestation

Landraces of maize (Zea mays L.) are invaluable sources of genetic variability for improving agronomic traits, and they hold great promise in developing new maize varieties with enhanced resilience to stresses. Even though phenotypic characterization is an inexpensive approach for elucidating variation hidden in genetic resources, information on the genetic diversity patterns in large collections of landraces remains limited and this constitutes a major impediment for their optimal utilization in modern maize breeding programs. We investigated the extent of phenotypic diversity among 196 maize landraces, representing gene pools from Burkina Faso, Ghana and Togo, and 14 improved populations/varieties from the Maize Improvement Program of International Institute of Tropical Agriculture (IITA-MIP). The germplasm was assessed for 26 agronomic traits. Highly significant differences (P < 0.001) were observed among the accessions for all measured traits. Cluster analysis separated the maize germplasm into five major groups, differentiated largely by phenology and overall phenotypic appeal, enabling identification of outstanding genotypes for further screening for stress tolerance. Wide genetic diversity was observed between Burkinabe and improved gene pools, suggesting that the original Sahelian gene pool might not have contributed much to modern cultivars. This gene pool offers opportunities for pre-breeding by providing novel alleles for enriching elite maize germplasm. Shannon-Weaver diversity index (H’) revealed high genetic variability among the landraces (H’ = 0.73) and a narrow genetic base in the improved populations and varieties (H’ = 0.46). These results provide new insights into the potential of tropical maize landraces for genetic improvement of maize.

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Additional Info

Field Value
Creator Badu-Apraku, Baffour
Creator Affiliation International Institute of Tropical Agriculture (IITA)
Creator ID Type ORCID
Creator ID 0000-0003-0113-5487
Subject Vocab (AGROVOC/GACS/CAB) Maize,Ear,Hybrids,Stress,Pollen,Climate,Climate change,Anthesis,Genetic diversity,Cultivars
Subject(s) Root lodging,STMA,Stalk lodging,Landraces
Publisher International Institute of Tropical Agriculture (IITA)
Contributor Person Nelimor, C., Badu-Apraku, B., Nguetta, S. P., Tetteh, A. Y., Garcia-Oliveira, A. L
Contributor Role Other
Contributor Project Lead Organisation Center International Institute of Tropical Agriculture (IITA)
Contributor Project Lead Center International Institute of Tropical Agriculture (IITA)
Contributor CRP CGIAR Research Program on Maize
Contributor Partner Not applicable
Contributor Donor Bill and Melinda Gates Foundation (BMGF)
Contributor Project Drought Tolerant Maize for Africa (DTMA)
Project ID
Contributor Affiliation International Institute of Tropical Agriculture (IITA)
Open-Access status Open Access
Production Date 2018-11-02
Embargo End Date
Content Type Dataset
File Format csv
Identifier Type DOI
Identifier https://doi.org/10.25502/4pz9-gq83/d
Identifier Citation Phenotypic characterization of maize landraces from Sahel and Coastal west Africa reveals marked diversity and potential for genetic improvement, Nelimor, C., Badu-Apraku, B., Nguetta, S. P., Tetteh, A. Y.* and Garcia-Oliveira, A. L., in: Journal of Crop Improvement, pages 1-17, ISSN 1542-7528, 2019. http://dx.doi.org/10.1080/15427528.2019.1674760
Source Drought Tolerant Maize for Africa (DTMA)
Language English
Relation Not applicable
Agroecological Zone Subhumid warm tropics
Coverage Region Western Africa
Coverage country Burkina Faso,Ghana,Togo
Coverage Admin Unit Not applicable
Coverage Y (Latitude) 12.23833, 7.94653, 8.61954
Coverage X (Longitude) -1.56159, -1.02319, 0.82478
Coverage Start Date 2018-02-27
Coverage End Date 2019-11-02
Contact Badu-Apraku, Baffour Maize Breeder, International Institute of Tropical Agriculture (IITA)
Contact Email b.badu-apraku@cgiar.org
Restriction CC-BY 4.0
Email Permission Not applicable
Rights CC-BY 4.0