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Título

Differential modulation of host plant δ13C and δ18O by native and nonnative arbuscular mycorrhizal fungi in a semiarid environment

AutorQuerejeta Mercader, José Ignacio ; Allen, Michael F.; Caravaca Ballester, María Fuensanta ; Roldán Garrigos, Antonio
Palabras claveRhamnus lycioides
Olea europaea
Glomus sp
Stable isotopes
Water-use efficiency (WUE)
Stomatal conductance
Drought
Semiarid environments
Fecha de publicación2006
EditorJohn Wiley & Sons
CitaciónNew Phytologist 169(2): 379-387 (2006)
ResumenNative, drought-adapted arbuscular mycorrhizal fungi (AMF) often improve host-plant performance to a greater extent than nonnative AMF in dry environments. However, little is known about the physiological basis for this differential plant response. • Seedlings of Olea europaea and Rhamnus lycioides were inoculated with either a mixture of eight native Glomus species or with the nonnative Glomus claroideum before field transplanting in a semiarid area. • Inoculation with native AMF produced the greatest improvement in nutrient and water status as well as in long-term growth for both Olea and Rhamnus. Foliar δ18O measurements indicated that native AMF enhanced stomatal conductance to a greater extent than nonnative AMF in Olea and Rhamnus.δ13C data showed that intrinsic water-use efficiency in Olea was differentially stimulated by native AMF compared with nonnative AMF. • Our results suggest that modulation of leaf gas exchange by native, drought-adapted AMF is critical to the long-term performance of host plants in semiarid environments. δ18O can provide a time-integrated measure of the effect of mycorrhizal infection on host-plant water relations.
Versión del editorhttp://dx.doi.org/10.1111/j.1469-8137.2005.01599.x
URIhttp://hdl.handle.net/10261/16479
DOI10.1111/j.1469-8137.2005.01599.x
ISSN1469-8137 (Online)
0028-646X (Print)
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