Título

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

Autor

Benhildah Masuka

Cosmos Magorokosho

Michael Olsen

Gary Atlin

Marianne Bänziger

Kevin Pixley

Bindiganavile Vivek

Maryke Labuschagne

rumbidzai matemba-mutasa

Juan Burgueño

Prasanna Boddupalli

Biswanath Das

Dan Makumbi

Amsal Tarekegne

Jose Crossa

Mainassara Zaman-Allah

Jill Cairns

Nivel de Acceso

Acceso Abierto

Resumen o descripción

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.

Fecha de publicación

2017

Tipo de publicación

Artículo

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Repositorio Orígen

Repositorio Institucional de Publicaciones Multimedia del CIMMYT

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