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Osmotic adjustment in maize: Genetic variation and association with water uptake

By: Chimenti, C.A | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Cantagallo, J [coaut.] | Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Pena-Valdivia, C.B [eds.] | Guevara, E [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Drought resistance | Genetic variation | Osmotic pressure | Resistance to injurious factors | Water uptake | CIMMYT | Zea mays AGROVOC | Genotypes AGROVOCDDC classification: 633.153 Summary: This paper reports on a study of osmotic adjustment in maize, an attribute linked to tolerance to water stress in some species. The hypotheses tested were: A) genotypes differ in their capacity for osmotic adjustment; and B) osmotic adjustment measured in the pre-flowering stage is associated with performance of plants exposed to water stress in the field. Twenty inbred lines were exposed to water stress under semi-controlled conditions during the 4 wk before flowering; stress was initiated at the sixth visible-leaf stage and was followed by a period of gradual drying out of the soil. Changes in water status of the plants were defined in terms of leaf relative water content (RWC) and osmotic potential (Y0). Degree of osmotic adjustment (OA) was expressed as the estimated value of RWC for a defined value of Y0 (taken here as -2 MPa), referred to as RWCe. Thus, a high RWCe indicates a high degree of OA. All genotypes showed some degree of OA. The range of RWCe obtained varied with genotype from 87% to 58%, and significant differences (P<0.05) in RWCe existed among genotypes. In a second experiment in the field, a subset of the inbred line collection was exposed to water stress 20 d before flowering. Water deficits reduced soil water extraction, dry matter, and yield. Variations in relative changes in these variables across genotypes were associated with variations in the degree of OA exhibited by the genotypes. We conclude that there is a substantial degree of intraspecific variation for OA in maize and that OA may explain some differences in yield observed in the field during water stress. These results suggest that OA estimates could be used to identify drought tolerant genotypes.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 1N624179
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This paper reports on a study of osmotic adjustment in maize, an attribute linked to tolerance to water stress in some species. The hypotheses tested were: A) genotypes differ in their capacity for osmotic adjustment; and B) osmotic adjustment measured in the pre-flowering stage is associated with performance of plants exposed to water stress in the field. Twenty inbred lines were exposed to water stress under semi-controlled conditions during the 4 wk before flowering; stress was initiated at the sixth visible-leaf stage and was followed by a period of gradual drying out of the soil. Changes in water status of the plants were defined in terms of leaf relative water content (RWC) and osmotic potential (Y0). Degree of osmotic adjustment (OA) was expressed as the estimated value of RWC for a defined value of Y0 (taken here as -2 MPa), referred to as RWCe. Thus, a high RWCe indicates a high degree of OA. All genotypes showed some degree of OA. The range of RWCe obtained varied with genotype from 87% to 58%, and significant differences (P<0.05) in RWCe existed among genotypes. In a second experiment in the field, a subset of the inbred line collection was exposed to water stress 20 d before flowering. Water deficits reduced soil water extraction, dry matter, and yield. Variations in relative changes in these variables across genotypes were associated with variations in the degree of OA exhibited by the genotypes. We conclude that there is a substantial degree of intraspecific variation for OA in maize and that OA may explain some differences in yield observed in the field during water stress. These results suggest that OA estimates could be used to identify drought tolerant genotypes.

English

9801|AGRIS 9702

Jose Juan Caballero

CIMMYT Publications Collection

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