Abstract.
Glasshouse experiments were conducted to study the response of non-host Brassica rapa and host Sorghum bicolor to inoculation with the arbuscular mycorrhizal fungus (AMF) Glomus etunicatum when given different levels of N (0.9 mmol kg–1 sand, 2.7 mmol kg–1 sand, 8.1 mmol kg–1 sand) and P (3.6 µmol kg–1 sand, 10.7 µmol kg–1 sand, 32.0 µmol kg–1 sand) fertiliser. On both plant species, the presence of G. etunicatum inoculum (+AMF) was associated with significant changes of shoot δ15N values, with +AMF plants having larger average δ15N values than uninoculated plants (–AMF). These values are the largest average differences in shoot δ15N yet recorded for AMF and nutrient effects. B. rapa shoot δ15N average differences ranged from 1.67‰ to 2.70‰, while for S. bicolor they range between 2.07‰ and 4.40‰. For shoot δ13C only the non-host B. rapa responded to ±AMF and added N. Although the harvested dry weight biomass (–35.2% B. rapa; +39.8% S. bicolor) of both plant species responded to AMF inoculation, no direct relationship was observed between isotopic discrimination and growth inhibition for the non-host B. rapa. In this paper we discuss some implications regarding AMF inocula on the basis of our findings and current literature.
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Fonseca, H.M., Berbara, R.L. & Daft, M.J. Shoot δ15N and δ13C values of non-host Brassica rapa change when exposed to ±Glomus etunicatum inoculum and three levels of phosphorus and nitrogen. Mycorrhiza 11, 151–158 (2001). https://doi.org/10.1007/s005720100125
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DOI: https://doi.org/10.1007/s005720100125