Plant isotopic composition provides insight into mechanisms underlying growth stimulation by AM fungi in a semiarid environment

Functional Plant Biology : FPB
J I QuerejetaA Roldán

Abstract

We hypothesised that improved plant water status and enhanced transpiration are key mechanisms involved in plant growth stimulation by native arbuscular mycorrhizal fungi (AMF) in semiarid calcareous soils. Seedlings of the dryland shrubs Pistacia lentiscus L. and Retama sphaerocarpa L. were pre-inoculated with a mixture of eight native Glomus spp. fungi, or left un-inoculated, before transplanting into a degraded site in south-eastern Spain. Pre-inoculated Pistacia and Retama shrubs grew faster after transplanting, despite spontaneous colonisation of control plants by local AMF. Pre-inoculation enhanced shoot water content and shoot δ15N in both shrub species. Increased potassium uptake and improved water relations were key mechanisms behind growth stimulation by native AMF in Pistacia. Shoot δ18O (a proxy measure of stomatal conductance) was significantly less negative in AMF-inoculated than in control Pistacia seedlings, indicating enhanced cumulative transpiration in the former. In contrast, shoot δ18O was unaffected by AMF inoculation in Retama, a leafless leguminous shrub with photosynthetic stems. Growth stimulation by native AMF in Retama was attributed to increased phosphorus uptake, enhanced atmospheric nitrogen fixat...Continue Reading

References

Jul 17, 1999·Rapid Communications in Mass Spectrometry : RCM·L L HandleyC M Scrimgeour
Feb 7, 2001·Applied and Environmental Microbiology·N RequenaJ M Barea
Mar 10, 2001·Trends in Plant Science·R D Evans
Jul 20, 2002·Annals of Botany·William A Hoffmann, Hendrik Poorter
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Nov 3, 2005·Journal of Experimental Botany·M S SheshshayeeM Udayakumar
Mar 1, 2007·Functional Plant Biology : FPB·Margaret M Barbour

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Citations

Sep 28, 2010·Journal of the Science of Food and Agriculture·María Del Mar AlguacilJosé Ignacio Querejeta
Mar 11, 2011·Plant, Cell & Environment·Cristina Moreno-GutiérrezJosé I Querejeta
Dec 8, 2011·Plant, Cell & Environment·Cristina Moreno-GutiérrezJosé Ignacio Querejeta

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