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Contribution of mid-altitude maize germplasm to tropical lowland breeding for striga hermonthica tolerance

By: The, C | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico) | Arnel R. Hallauer International Symposium on Plant Breeding Mexico, D.F. (Mexico) 17-22 Aug 2003.
Contributor(s): Badu-Apraku, B | Kim, S.K [coaut.] | Menkir, A | Tagne, A [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 2003Description: p. 100-101.Subject(s): Cereal crops | Genetic resistance | Germplasm | Inbred lines | Maize | Striga hermonthica | Genotypes AGROVOC | Plant breeding AGROVOCDDC classification: 631.53 Summary: Striga hermonthica, a parasitic weed, attacks cereal crops throughout sub-Saharan Africa and yield losses are estimated between 30% and 60% (Kim et al. 2002). Open pollinated synthetic varieties of maize have only moderate levels of tolerance/resistance (STR) to Striga hermonthica. Progress in developing new STR materials is hindered by the variations in genotype-by-environment interactions (GxE) encountered across this region and the limited range of genetic variation for tolerance/resistance (Devries 1999). To develop high levels of tolerance/resistance to Striga, high STR parents must be identified and trials introgressed into adapted materials. Tolerance and/ or resistance to some lowland stress was identified in mid-altitude germplasm (Berner 1995; The 1997). The objective of this study was to measure the breeding values and combining abilities of mid-altitude maize germplasm under Striga hermonthica when crossed to lowland lines and identify tolerant inbreds/hybrids for use in West and Centra1 Africa.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 1E632399
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Striga hermonthica, a parasitic weed, attacks cereal crops throughout sub-Saharan Africa and yield losses are estimated between 30% and 60% (Kim et al. 2002). Open pollinated synthetic varieties of maize have only moderate levels of tolerance/resistance (STR) to Striga hermonthica. Progress in developing new STR materials is hindered by the variations in genotype-by-environment interactions (GxE) encountered across this region and the limited range of genetic variation for tolerance/resistance (Devries 1999). To develop high levels of tolerance/resistance to Striga, high STR parents must be identified and trials introgressed into adapted materials. Tolerance and/ or resistance to some lowland stress was identified in mid-altitude germplasm (Berner 1995; The 1997). The objective of this study was to measure the breeding values and combining abilities of mid-altitude maize germplasm under Striga hermonthica when crossed to lowland lines and identify tolerant inbreds/hybrids for use in West and Centra1 Africa.

English

0309|AGRIS 0301|AL-Maize Program

Juan Carlos Mendieta

CIMMYT Publications Collection

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