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Phosphorus nutrition-mediated effects of arbuscular mycorrhiza on leaf morphology and carbon allocation in perennial ryegrass
Article first published online: 7 JUL 2005
DOI: 10.1111/j.1469-8137.2005.01500.x
1469-8137/asset/cover.gif?v=1&s=570a3a280b205b8cd6b43e7a8ee052e7536c7006 "New Phytologist")
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How to Cite
Grimoldi, A. A., Kavanová, M., Lattanzi, F. A. and Schnyder, H. (2005), Phosphorus nutrition-mediated effects of arbuscular mycorrhiza on leaf morphology and carbon allocation in perennial ryegrass. New Phytologist, 168: 435–444. doi: 10.1111/j.1469-8137.2005.01500.x
Publication History
- Issue published online: 7 JUL 2005
- Article first published online: 7 JUL 2005
- Received: 7 April 2005 Accepted: 31 May 2005
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Keywords:
- allocation;
- arbuscular mycorrhizal fungus (AMF);
- Glomus hoi;
- leaf mass per area;
- Lolium perenne (perennial ryegrass);
- phosphorus nutrition;
- structural carbon;
- water-soluble carbohydrates
Summary
- • The aim of this work was to disentangle phosphorus status-dependent and -independent effects of arbuscular mycorrhizal fungus (AMF) on leaf morphology and carbon allocation in perennial ryegrass (Lolium perenne).
- • To this end, we assessed the P-response function of morphological components in mycorrhizal and nonmycorrhizal plants of similar size.
- • AMF (Glomus hoi) stimulated relative P-uptake rate, decreased leaf mass per area (LMA), and increased shoot mass ratio at low P supply. Lower LMA was caused by both decreased tissue density and thickness. Variation in tissue density was almost entirely caused by variations in soluble C, while that in thickness involved structural changes.
- • All effects of AMF were indistinguishable from those mediated by increases in relative P-uptake rate through higher P-supply rates. Thus the relationships between relative P-uptake rate, leaf morphology and C allocation were identical in mycorrhizal and nonmycorrhizal plants. No evidence was found for AMF effects not mediated by changes in plant P status.