Genetic Variances and Heritabilities of Early Yellow Maize Population Following Cycles of Improvement for Striga Resistance and Drought Tolerance

Drought and Striga are principal constraints to maize (Zea mays L.) production in sub-Saharan Africa. An early yellow maize population, TZE-Y Pop DT STR, which had undergone five cycles of selection for resistance to Striga, followed by three cycles of improvement for drought tolerance, was investigated for yield gains, changes in genetic variance, and interrelationships among traits under drought stress and optimum environments. Two hundred and forty S1 lines comprising 60 each from the base population and subsequent populations from three selection cycles improved for grain yield and drought tolerance were assessed under drought and optimal environments in Nigeria from 2010 to 2012. Genetic improvements in grain yield of 423 and 518 kg ha−1 cycle−1 were achieved under drought stress and optimal environments. Predicted improvements in selection for yield were 348 and 377 kg ha−1 cycle−1 under drought stress and optimum environments, respectively. The highest yield observed in C3 was accompanied by reduced days to silking and anthesis–silking interval, improved plant aspect and ear aspect, and increased plant height and ears per plant across research environments, as well as improved stay-green characteristic under drought. The level of genetic variability for yield and a few other traits were maintained under drought and optimal environments in the population. The presence of residual genetic variability for yield and other assayed traits in C3 indicated that progress could be made from future selection in the population depending on the ability of breeders to identify outstanding genotypes and the precision level of experimentation. Substantial improvement has been made in yield and drought tolerance in C3 of the population.

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Additional Info

Field Value
Creator Badu-Apraku, Baffour
Creator ID Type ORCID
Creator ID 0000-0003-0113-5486
Subject Vocab Maize,Yield,Yellow,Striga,Drought
Subject(s) Drought Tolerant Maize for Africa,Maize
Publisher International Institute of Tropical Agriculture (IITA)
Contributor Person R. Asiedu, Talabi O.A., Ifie B. E., Obeng-Bio E.
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 Not Applicable
Contributor Affiliation Not Applicable
Open-Access status Open Access
Production Date 2018-07-24
Embargo End Date
Content Type Dataset
File Format csv
Identifier Type DOI
Identifier http://dx.doi.org/10.25502/20181101/1128/BB
Identifier Citation Genetic variances and heritabilities of early yellow maize population following cycles of improvement for Striga resistance and drought tolerance, Badu-Apraku, B., Ifie, B. E., Talabi, A. O., Obeng-Bio, E. and Asiedu, R., in: Crop Science, pages 1-35, ISSN 0011-183X, 2018. http://dx.doi.org/10.2135/cropsci2017.10.0628
Source Drought Tolerant Maize for Africa
Language English
Relation Not Applicable
Agroecological Zone Semihumid warm tropics
Coverage Region Western Africa
Coverage country Nigeria
Coverage Admin Unit Not Applicable
Coverage X 9.08200
Coverage Y 8.67528
Coverage Start Date 2010
Coverage End Date 2012
Contact Badu-Apraku, Baffour; Maize Unit, International Institute of Tropical Agriculture (IITA)
Contact Email b.badu-apraku@cgiar.org
Restriction Not Applicable
Email Permission Not Applicable
Rights CC-BY 4.0