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Exploitation of combining ability and heterotic responses in maize germplasm to develop cultivars for the Eastern African Highlands

By: Twumasi Afriyie, S | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Napir, G [coaut.] | Yihun, K [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 2003Description: p. 282-283.Subject(s): Cultivation | Experimentation | Food crops | Germplasm | Grain yield | Inbred lines | International cooperation | Maize | Plant developmental stages | Plant growth substances | Agricultural research AGROVOCDDC classification: 631.53 Summary: Maize is a major food staple in eastem Africa. About 2 million hectares, nearly one-third of the regionts total maize area, is grown in the highlands (above 1600 masl). A major constraint identified in the zone is low grain yield due to the narrow genetic base of maize cultivars. No major germplasm introductions have been made since the introduction of the Kitale and Ecuador synthetics in 1959, leading to the lack of new improved varieties in the highland zones (Zeleke 1993; Lethrop 1994).ln 1998, CIMMYT and national agricultural research programs in the region began collaborative research to develop and improve highland maize germplasm there. Two main approaches were used: (1) Localland races were collected and evaluated in six countries (Ethiopia, Kenya, Tanzania, Uganda, Burundi and Rwanda) with the objective of exploiting them for novel genes to improve the germplasm base in the highland zone for the long term. (2) Inbred lines derived from an elite population originally derived from eastem African germplasm by CIMMYT were characterized into heterotic groups (Twumasi-Afriyie et al. 2002). This paper outlines a systematic breeding approach used to develop cultivars for the region in the short term.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 631.53 BOO (Browse shelf) 1 Available 3J632399
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Maize is a major food staple in eastem Africa. About 2 million hectares, nearly one-third of the regionts total maize area, is grown in the highlands (above 1600 masl). A major constraint identified in the zone is low grain yield due to the narrow genetic base of maize cultivars. No major germplasm introductions have been made since the introduction of the Kitale and Ecuador synthetics in 1959, leading to the lack of new improved varieties in the highland zones (Zeleke 1993; Lethrop 1994).ln 1998, CIMMYT and national agricultural research programs in the region began collaborative research to develop and improve highland maize germplasm there. Two main approaches were used: (1) Localland races were collected and evaluated in six countries (Ethiopia, Kenya, Tanzania, Uganda, Burundi and Rwanda) with the objective of exploiting them for novel genes to improve the germplasm base in the highland zone for the long term. (2) Inbred lines derived from an elite population originally derived from eastem African germplasm by CIMMYT were characterized into heterotic groups (Twumasi-Afriyie et al. 2002). This paper outlines a systematic breeding approach used to develop cultivars for the region in the short term.

Global Maize Program

English

0309|AGRIS 0301|AL-Maize Program

Juan Carlos Mendieta

INT2402

CIMMYT Publications Collection

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Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org