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Resultados y proyecciones del mejoramiento de maiz para tolerancia a sequia en Ecuador

By: Reyes T., S | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Pena-Valdivia, C.B [eds.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Climatic factors | Drought resistance | Drought stress AGROVOC | Ecuador | Selection | CIMMYT | Zea mays AGROVOC | Genetics AGROVOC | Plant breeding AGROVOCDDC classification: 633.153 Summary: In 1994, 170,000 ha of flint maize was planted along the Ecuadorian coast, including the valleys of Loja province where rainfall ranges from 400 to 600 mm during the crop cycle. The effect of scarce and irregular rainfall is increased by soil problems (most plots are on steep slopes), resulting in low yields and in some cases total harvest loss. The region is dominated by smallholder farmers for whom maize is both a tradition and a necessity, thereby making it difficult to replace the crop with other species which might be better suited to the area. It is believed that the lese of cultivars with drought tolerance - especially in the critical flowering stage - would help reduce the risk of harvest losses and increase productivity. Since 1988 INIAP has worked to develop maize varieties with drought tolerance during flowering and adapted to Ecuadorian ecologies, drawing on the germplasm and technology generated by the International Maize and Wheat Improvement Center (CIMMYT). S1 lines were selected under differing moisture conditions and then recombined, forming the improved cultivars INIAP-540 (derived from the CIMMYT Tuxpeño drought selection C6) and INIAP-542 (derived from CIMMYT Pool 26 drought selection C1). The two cultivars have been commercially released and have shown good performance and production stability in low rainfall areas. Currently, through the recombination of various cultivars selected for drought tolerance by CIMMYT, two basic populations have been formed (white and yellow) that will be used to obtain varieties and hybrids.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.153 EDM (Browse shelf) 1 Available 3A624179
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In 1994, 170,000 ha of flint maize was planted along the Ecuadorian coast, including the valleys of Loja province where rainfall ranges from 400 to 600 mm during the crop cycle. The effect of scarce and irregular rainfall is increased by soil problems (most plots are on steep slopes), resulting in low yields and in some cases total harvest loss. The region is dominated by smallholder farmers for whom maize is both a tradition and a necessity, thereby making it difficult to replace the crop with other species which might be better suited to the area. It is believed that the lese of cultivars with drought tolerance - especially in the critical flowering stage - would help reduce the risk of harvest losses and increase productivity. Since 1988 INIAP has worked to develop maize varieties with drought tolerance during flowering and adapted to Ecuadorian ecologies, drawing on the germplasm and technology generated by the International Maize and Wheat Improvement Center (CIMMYT). S1 lines were selected under differing moisture conditions and then recombined, forming the improved cultivars INIAP-540 (derived from the CIMMYT Tuxpeño drought selection C6) and INIAP-542 (derived from CIMMYT Pool 26 drought selection C1). The two cultivars have been commercially released and have shown good performance and production stability in low rainfall areas. Currently, through the recombination of various cultivars selected for drought tolerance by CIMMYT, two basic populations have been formed (white and yellow) that will be used to obtain varieties and hybrids.

Spanish

9802|AGRIS 9702

Jose Juan Caballero

CIMMYT Publications Collection

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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