Rapid responses of C14 clone of Eucalyptus globulus to root drought stress: Time-course of hormonal and physiological signaling
| Autor: | Candela Cuesta, Ana Rodríguez, Víctor Granda, Belén Fernández, Rubén Álvarez, Ricardo J. Ordás, Isabel Feito, María Luz Centeno, Juan Majada |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Cytokinins
Physiology Clone (cell biology) Plant Science Photosynthesis Plant Roots chemistry.chemical_compound Gene Expression Regulation Plant Botany Abscisic acid Eucalyptus biology fungi Myrtaceae food and beverages Plant physiology Hydrogen-Ion Concentration biology.organism_classification Droughts chemistry Eucalyptus globulus Cytokinin Agronomy and Crop Science Abscisic Acid Signal Transduction |
| Zdroj: | Journal of Plant Physiology. 168:661-670 |
| ISSN: | 0176-1617 |
| DOI: | 10.1016/j.jplph.2010.09.015 |
| Popis: | The responses of juvenile plants of forest crops to drought stress are a key stage in the survival of forest populations. In this work, a suitable experimental system to study the early drought resistance mechanisms and signaling in a drought-tolerant clone (C14) of Eucalyptus globulus Labill is proposed. This system, using hydroponic culture and an osmotic agent, polyethylene glycol 8000, was demonstrated to induce severe stress in the root area, affecting the responses of the plantlets at the aerial level. These responses were very fast, beginning only 3 h after the induction of stress, and the results highlight the roles of xylematic abscisic acid (ABA) and pH changes over other signals, such as cytokinins, as early chemical signals in rapid water stress. The relationship between these chemical factors, ABA and pH, and the physiological and water parameters observed were significant, supporting their proposed principal role. This work aids our understanding of underlying responses to hydrological limitations of forest crops, and provides valuable information for further physiological and molecular studies of water stress in this and other tree species. |
| Databáze: | OpenAIRE |
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