Normal view MARC view ISBD view

Selection for drought tolerance in a tropical maize population increases capacity of photosynthetic mechanism to withstand drought stress

By: Manda, T.H.E | 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.] | Lemeur, R [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Biosynthesis | Drought resistance | Drought stress AGROVOC | Plant physiology | Selection | Tropical zones | CIMMYT | Zea mays AGROVOC | Plant breeding AGROVOCDDC classification: 633.153 Summary: An efficient breeding program for drought tolerance is difficult to implement by using the sole criterion of yield performance under stress, therefore, physiological and phenological components of drought tolerance should also be considered during selection. The aim of this study was to investigate the effect of drought stress on leaf net photosynthetic rates in two contrasting selection cycles, C0 and C8, of a tropical lowland maize population, 'Tuxpeño Sequia', that had been selected for tolerance to drought in the field. A split-plot design with five replications was used. Time of sampling was taken as main-plots and genotypes as slab-plots. Plants were grown in the greenhouse in gutters using a nutrient film technique. The two genotypes were water-stressed for three months, during which genotypic differences in photosynthesis were monitored. The photosynthetic capacity for the drought-sensitive genotype (C0) was more affected than that of the drought tolerant one (C8), as shown by differences in the C02 assimilation rate and the inter-cellular C02 concentration. It was further observed that increasing light intensity under drought stress resulted in a greater increase in the carbon exchange rate (CER) of the drought tolerant population. The authors conclude that CER appears to be one possible parameter that could be used in the identification of drought tolerant maize genotypes.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 1R624179
Total holds: 0

An efficient breeding program for drought tolerance is difficult to implement by using the sole criterion of yield performance under stress, therefore, physiological and phenological components of drought tolerance should also be considered during selection. The aim of this study was to investigate the effect of drought stress on leaf net photosynthetic rates in two contrasting selection cycles, C0 and C8, of a tropical lowland maize population, 'Tuxpeño Sequia', that had been selected for tolerance to drought in the field. A split-plot design with five replications was used. Time of sampling was taken as main-plots and genotypes as slab-plots. Plants were grown in the greenhouse in gutters using a nutrient film technique. The two genotypes were water-stressed for three months, during which genotypic differences in photosynthesis were monitored. The photosynthetic capacity for the drought-sensitive genotype (C0) was more affected than that of the drought tolerant one (C8), as shown by differences in the C02 assimilation rate and the inter-cellular C02 concentration. It was further observed that increasing light intensity under drought stress resulted in a greater increase in the carbon exchange rate (CER) of the drought tolerant population. The authors conclude that CER appears to be one possible parameter that could be used in the identification of drought tolerant maize genotypes.

English

9802|AGRIS 9702

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