Normal view MARC view ISBD view

Desarrollo y mejoramiento de germoplasma de maíz con tolerancia a sequía para las zonas tropicales de América Central

By: Brizuela, L | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Bolaños, J.A [coaut.] | Cordova, H.S [coaut.] | Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Peña-Valdivia, C.B [eds.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: México, DF (México) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Central America | Drought resistance | Drought stress AGROVOC | Germplasm | Selection | Tropical zones | CIMMYT | Zea mays AGROVOC | Yields AGROVOC | Plant breeding AGROVOCDDC classification: 633.153 Summary: Drought is an adverse abiotic factor that further limits the productivity of maize cultivation in marginal environments of Central America and the Caribbean. Drought problems are aggravated when maize is sown on hillside soils with limited water retention capacity or in environments with scarce or erratic rainfall. In these areas, average yield ranges between 0.3 and 0.5 t/ha. Based on this appraisal, the Regional Maize Program (Programa Regional de Maiz, PRM)for Central America and the Caribbean, in conjunction with CIMMYT, is developing a collaborative project for maize genetic improvement. The purpose of this project is to generate and release improved synthetic varieties adapted to limited rainfall conditions and with agronomic performance superior to that of cultivars sown by farmers in marginal areas. The genetic improvement approach used consists of recurrent selection of S2 lines of the population Tuxpeño Sequia C6 (TS6) x BS19TS6. Through recurrent selection, we are attempting to accumulate the frequency of favorable genes that determine the cultivars' adaptation to low rainfall conditions and in turn contribute to yield stability in marginal environments. The S2 lines are generated in Honduras. The superior fraction is recombined and experimental synthetics are formed for evaluation in regional trials in multiple environments. Lines are evaluated in Guatemala, El Salvador and Honduras with varying levels of drought. The superior fraction is selected on the basis of an index which includes yield, prolificacy, and anthesis-silking interval. In 1995, the fourth selection cycle was completed, in which the average yield of the experimental variety surpassed the population average by 2.3 t/ha. The outcome of this collaborative project has been the release of synthetic varieties in various countries in the region. Among them is the synthetic B-107, which has up to a 20% greater grain yield than other improved varieties.Collection: CIMMYT Publications Collection
Tags from this library: No tags from this library for this title. Log in to add tags.
    average rating: 0.0 (0 votes)
Item type Current location Collection Call number Copy number Status Date due Barcode Item holds
Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.153 EDM (Browse shelf) 1 Available 3B624179
Total holds: 0

Drought is an adverse abiotic factor that further limits the productivity of maize cultivation in marginal environments of Central America and the Caribbean. Drought problems are aggravated when maize is sown on hillside soils with limited water retention capacity or in environments with scarce or erratic rainfall. In these areas, average yield ranges between 0.3 and 0.5 t/ha. Based on this appraisal, the Regional Maize Program (Programa Regional de Maiz, PRM)for Central America and the Caribbean, in conjunction with CIMMYT, is developing a collaborative project for maize genetic improvement. The purpose of this project is to generate and release improved synthetic varieties adapted to limited rainfall conditions and with agronomic performance superior to that of cultivars sown by farmers in marginal areas. The genetic improvement approach used consists of recurrent selection of S2 lines of the population Tuxpeño Sequia C6 (TS6) x BS19TS6. Through recurrent selection, we are attempting to accumulate the frequency of favorable genes that determine the cultivars' adaptation to low rainfall conditions and in turn contribute to yield stability in marginal environments. The S2 lines are generated in Honduras. The superior fraction is recombined and experimental synthetics are formed for evaluation in regional trials in multiple environments. Lines are evaluated in Guatemala, El Salvador and Honduras with varying levels of drought. The superior fraction is selected on the basis of an index which includes yield, prolificacy, and anthesis-silking interval. In 1995, the fourth selection cycle was completed, in which the average yield of the experimental variety surpassed the population average by 2.3 t/ha. The outcome of this collaborative project has been the release of synthetic varieties in various countries in the region. Among them is the synthetic B-107, which has up to a 20% greater grain yield than other improved varieties.

Spanish

9802|AGRIS 9702|anterior|R97-98PROCE|FINAL9798

Jose Juan Caballero

CIMMYT Publications Collection

There are no comments for this item.

Log in to your account to post a comment.
baner

International Maize and Wheat Improvement Center (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
Monday –Friday 9:00 am. 17:00 pm. If you have any question, please contact us at CIMMYT-Knowledge-Center@cgiar.org

Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
Lunes –Viernes 9:00 am. 17:00 pm. Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org