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Gains in maize genetic improvement in Eastern and Southern Africa : II. CIMMYT open-pollinated variety breeding pipeline

Author: Masuka, B.
Author: Magorokosho, C.
Author: Olsen, M.
Author: Atlin, G.N.
Author: Banziger, M.
Author: Pixley, K.V.
Author: Vivek, B.
Author: Labuschagne, M.
Author: Matemba-Mutasa, R.
Author: Burgueño, J.
Author: MacRobert, J.F.
Author: Prasanna, B.M.
Author: Das, B.
Author: Makumbi, D.
Author: Amsal Tesfaye Tarekegne
Author: Crossa, J.
Author: Zaman-Allah, Mainassara
Author: Biljon, A.
Author: Cairns, J.E.
Year: 2017
URI: http://hdl.handle.net/10883/18612
Descriptors: Maize
Descriptors: Breeding
Abstract: Open-pollinated varieties (OP Vs) still represent a significant proportion of the maize (Zea mays L.) seed system in many countries of sub- Saharan Africa. The International Maize and Wheat Improvement Centre (CIMMYT) has been breeding improved maize varieties for the stress-prone environments experienced by most smallholder farmers in eastern and southern Africa for over 30 yr. Hybrid breeding is now the major focus of the CIMMYT breeding pipeline. However, OP Vs are generated within the hybrid pipeline. This is the first study to document genetic gain for maize grain yield under both optimal and stress (random and managed drought, low nitrogen [N], and maize streak virus [MSV]) conditions within the CIMMYT eastern and southern African OP V breeding pipeline. Genetic gain was estimated using the slope of the regression on the year of OP V release in regional trials over a 12-yr period (1999–2011). Open-pollinated varieties were separated into two maturity groups, early (<70 d to anthesis) and intermediate-late (>70 d to anthesis). Genetic gain in the early maturity group under optimal conditions, random drought, low N, and MSV was 109.9, 29.2, 84.8, and 192.9 kg ha−1 yr−1. In the intermediate-late maturity group, genetic gain under optimal conditions, random drought, low N, and MSV was 79.1, 42.3, 53.0 and 108.7 kg ha−1 yr−1. No significant yield gains were made under managed drought stress for both maturity groups. Our results show continued improvement in OP Vs for both yield potential and stress tolerance.
Language: English
Publisher: CSSA
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Place: USA
Pages: 180-191
Journal: Crop Science
Journal volume: 57
DOI: 10.2135/cropsci2016.05.0408


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  • Maize
    Maize breeding, phytopathology, entomology, physiology, quality, and biotech

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