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Development of Ciba's drought tolerant maize hybrids in Thailand

By: Sukjaroen, P | 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.] | Prasatsrisupab, T [coaut.] | Suwantaradon, K [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Drought resistance | Drought stress AGROVOC | Resistance to injurious factors | Thailand | CIMMYT | Zea mays AGROVOC | Hybrids AGROVOC | Plant breeding AGROVOCDDC classification: 633.153 Summary: All grain maize growing areas in Thailand are rainfed. Nearly every year it is normal to have severe drought stress resulting in crop damage or failure in many of the major production areas. One of Ciba's research objectives is to develop hybrids that yield well under both normal and drought stress conditions. To meet this objective, various practices and selection criteria have been employed during the breeding and evaluation of inbred lines and hybrids. During inbred line development, breeding materials are grown at high plant densities in nurseries with different soil types, both during the rainy season and the dry season under irrigation and high temperatures. Selection criteria include characters related to drought tolerance: synchronization of male and female flowering, prolificacy, heat stress damage, etc. Experimental hybrids are evaluated in yield trials sown in a wide variety of environments, using two plant densities, different sowing dates, and different soil types and fertility levels at various locations, including drought prone areas. Locations are separated into groups, stress or non-stress, according to their rainfall and its distribution during various plant development stages. After harvest, average yield for each entry is calculated for each location group and the averages are used in a drought index. The index is used together with the performance data for other agronomic traits to select promising hybrids for further testing or commercialization. Hybrids G-5431 and G-5440, also called Hercules 31 or Hercules 40, are examples of Ciba's success in developing drought tolerant hybrids. They were released in 1987, and are still important commercial varieties for drought-stressed areas.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 Z624179
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All grain maize growing areas in Thailand are rainfed. Nearly every year it is normal to have severe drought stress resulting in crop damage or failure in many of the major production areas. One of Ciba's research objectives is to develop hybrids that yield well under both normal and drought stress conditions. To meet this objective, various practices and selection criteria have been employed during the breeding and evaluation of inbred lines and hybrids. During inbred line development, breeding materials are grown at high plant densities in nurseries with different soil types, both during the rainy season and the dry season under irrigation and high temperatures. Selection criteria include characters related to drought tolerance: synchronization of male and female flowering, prolificacy, heat stress damage, etc. Experimental hybrids are evaluated in yield trials sown in a wide variety of environments, using two plant densities, different sowing dates, and different soil types and fertility levels at various locations, including drought prone areas. Locations are separated into groups, stress or non-stress, according to their rainfall and its distribution during various plant development stages. After harvest, average yield for each entry is calculated for each location group and the averages are used in a drought index. The index is used together with the performance data for other agronomic traits to select promising hybrids for further testing or commercialization. Hybrids G-5431 and G-5440, also called Hercules 31 or Hercules 40, are examples of Ciba's success in developing drought tolerant hybrids. They were released in 1987, and are still important commercial varieties for drought-stressed areas.

English

9801|AGRIS 9702

Jose Juan Caballero

CIMMYT Publications Collection

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