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Screening and selection of tropical maize genotypes for drought tolerance using primary and secondary traits

By: Manda, T.H.E | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): CIMMYT | Mwambula, C [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Addis Ababa (Ethiopia) CIMMYT|EARO : 1999Description: p. 32-34.ISBN: 92-9146-065-6.Subject(s): Agronomic characters | Drought AGROVOC | Drought resistance | Drought stress AGROVOC | Genotype environment interaction AGROVOC | Maize | Research projects | Yield factors | CIMMYT | Zea mays AGROVOC | Plant breeding AGROVOCDDC classification: 633.15 Summary: Elite tropical maize germplasm contains considerable genetic variability for yield, anthesis-silking interval (ASI), and other morphological and physiological traits indicative of improved performance under drought. Eighty-one top crosses, five populations and ten hybrids were evaluated for drought tolerance both under natural rainfall conditions in the 1996/97 main season and under managed drought stress conditions in the 1997 winter dry season. Evaluation under managed drought stress was conducted at the National irrigation Research Station (NIRS) in southern Zambia and water was withheld for five weeks before and during flowering. Genotypes yielded between 2.4 tonnes ha-1 and 4.6 tonnes ha-1 under natural rainfall conditions and between 0.5 tonnes ha-1 and 5.7 tonnes ha-1 under managed drought conditions. Anthesis-silking interval and number of ears per plant were the only secondary traits that significantly (P<0.05) correlated with grain yield at both sites. We conclude that ASI can provide information at flowering to direct crosses for a drought breeding program as it gives a reasonable estimate of yield well before harvest.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.15 EAS No. 6 (Browse shelf) 1 Available G649283
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Elite tropical maize germplasm contains considerable genetic variability for yield, anthesis-silking interval (ASI), and other morphological and physiological traits indicative of improved performance under drought. Eighty-one top crosses, five populations and ten hybrids were evaluated for drought tolerance both under natural rainfall conditions in the 1996/97 main season and under managed drought stress conditions in the 1997 winter dry season. Evaluation under managed drought stress was conducted at the National irrigation Research Station (NIRS) in southern Zambia and water was withheld for five weeks before and during flowering. Genotypes yielded between 2.4 tonnes ha-1 and 4.6 tonnes ha-1 under natural rainfall conditions and between 0.5 tonnes ha-1 and 5.7 tonnes ha-1 under managed drought conditions. Anthesis-silking interval and number of ears per plant were the only secondary traits that significantly (P<0.05) correlated with grain yield at both sites. We conclude that ASI can provide information at flowering to direct crosses for a drought breeding program as it gives a reasonable estimate of yield well before harvest.

English

0103|AL-Maize Program|AGRIS 0102|AJ

CIMMYT Publications Collection

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