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Role of the phytohormone ABA in drought tolerance: Potential utility as a selection tool

By: Setter, T.L | 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): Drought resistance | Drought stress AGROVOC | Genetic variation | Plant growth substances | Plant physiology | Resistance to injurious factors | CIMMYTDDC classification: 633.153 Summary: Knowledge concerning the physiology and molecular biology of abscisic acid (ABA) responses in plants has advanced considerably in recent years. This information has shown that ABA has numerous roles in stimulating adaptive responses to water deficit and other stresses. Methods for ABA assay have improved so that they are now sensitive and economical for large-scale lese. Several features of the ABA- mediated response to drought suggest that ABA assay might be a useful selection tool in breeding for drought tolerance. ABA stimulates several processes that conserve water and induce desiccation-protective cellular changes, including stomatal closure, increased root:shoot ratio, osmolyte accumulation, and accumulation of substances that stabilize cellular structures. ABA is also involved in developmental responses that alter plant ontogeny and partitioning of resources in ways that could improve plant adaptation to drought. Such responses include induction of leaf senescence, inhibition of leaf and stem growth, and abortion of reproductive organ development. Although these responses may confer improved plant survival in severe drought, they may decrease yield performance in less stressful environments. Furthermore, because ABA synthesis dramatically increases in response to loss of tissue water, the extent to which a genotype accumulates ABA during mild water deficit may indicate its degree of failure to adequately employ stress avoidance responses. Thus, the use of ABA assay as a selection tool may require careful choice of the selection environment in relation to breeding objectives.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 1D624179
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Knowledge concerning the physiology and molecular biology of abscisic acid (ABA) responses in plants has advanced considerably in recent years. This information has shown that ABA has numerous roles in stimulating adaptive responses to water deficit and other stresses. Methods for ABA assay have improved so that they are now sensitive and economical for large-scale lese. Several features of the ABA- mediated response to drought suggest that ABA assay might be a useful selection tool in breeding for drought tolerance. ABA stimulates several processes that conserve water and induce desiccation-protective cellular changes, including stomatal closure, increased root:shoot ratio, osmolyte accumulation, and accumulation of substances that stabilize cellular structures. ABA is also involved in developmental responses that alter plant ontogeny and partitioning of resources in ways that could improve plant adaptation to drought. Such responses include induction of leaf senescence, inhibition of leaf and stem growth, and abortion of reproductive organ development. Although these responses may confer improved plant survival in severe drought, they may decrease yield performance in less stressful environments. Furthermore, because ABA synthesis dramatically increases in response to loss of tissue water, the extent to which a genotype accumulates ABA during mild water deficit may indicate its degree of failure to adequately employ stress avoidance responses. Thus, the use of ABA assay as a selection tool may require careful choice of the selection environment in relation to breeding objectives.

English

9801|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.
Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org