Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/17084
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Título : Variations in water status, gas exchange, and growth in Rosmarinus officinalis plants infected with Glomus deserticola under drought conditions
Autor : Sánchez-Blanco, María Jesús, Ferrández, Trinitario, Morales, María Angeles, Morte, Asunción, Alarcón Cabañero, Juan José
Palabras clave : Arbuscular mycorrhiza
Glomus deserticola
Rosmarinus officinalis
Water relations
Water stress
Fecha de publicación : 4-Nov-2004
Editor: Elsevier
Citación : Journal of Plant Physiology 161(6) :675-682 (2004)
Resumen: The influence of the arbuscular mycorrhizal fungus Glomus deserticola on the water relations, gas exchange parameters, and vegetative growth of Rosmarinus officinalis plants under water stress was studied. Plants were grown with and without the mycorrhizal fungus under glasshouse conditions and subjected to water stress by withholding irrigation water for 14 days. Along the experimental period, a significant effect of the fungus on the plant growth was observed, and under water stress, mycorrhizal plants showed an increase in aerial and root biomass compared to non-mycorrhizal plants. The decrease in the soil water potential generated a decrease in leaf water potential (Ψl) and stem water potential (Ψx) of mycorrhizal and non-mycorrhizal plants, with this decrease being lower in mycorrhizal water-stressed plants. Mycorrhization also had positive effects on the root hydraulic conductivity (Lp) of water stressed plants. Furthermore, mycorrhizal-stressed plants showed a more important decrease in osmotic potential at full turgor (Ψos) than did non-mycorrhizal-stressed plants, indicating the capacity of osmotic adjustment. Mycorrhizal infection also improved photosynthetic activity (Ψn) and stomatal conductance (gs) in plants under water stress compared to the non-mycorrhizal-stressed plants. A similar behaviour was observed in the photochemical efficiency of PSII (Fv/Fm) with this parameter being lower in non-mycorrhizal plants than in mycorrhizal plants under water stress conditions. In the same way, under water restriction, mycorrhizal plants showed higher values of chlorophyll content than did non-mycorrhizal plants. Thus, the results obtained indicated that the mycorrhizal symbiosis had a beneficial effect on the water status and growth of Rosmarinus officinalis plants under water-stress conditions.
Versión del editor: http://dx.doi.org/10.1078/0176-1617-01191
URI : http://hdl.handle.net/10261/17084
ISSN: 0176-1617
DOI: 10.1078/0176-1617-01191
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