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Phosphorus nutrition and mycorrhiza effects on grass leaf growth. P status- and size-mediated effects on growth zone kinematics

  1. MONIKA KAVANOVÁ,
  2. AGUSTÍN A. GRIMOLDI,
  3. FERNANDO A. LATTANZI,
  4. HANS SCHNYDER*

Article first published online: 3 OCT 2005

DOI: 10.1111/j.1365-3040.2005.01428.x

Issue

Plant, Cell & Environment

Plant, Cell & Environment

Volume 29, Issue 4, pages 511–520, April 2006

Additional Information

How to Cite

KAVANOVÁ, M., GRIMOLDI, A. A., LATTANZI, F. A. and SCHNYDER, H. (2006), Phosphorus nutrition and mycorrhiza effects on grass leaf growth. P status- and size-mediated effects on growth zone kinematics. Plant, Cell & Environment, 29: 511–520. doi: 10.1111/j.1365-3040.2005.01428.x

Author Information

  1. Lehrstuhl für Grünlandlehre, Technische Universität München, Am Hochanger 1, D-85350 Freising-Weihenstephan, Germany

*Hans Schnyder. Fax: +49 8161 713243; e-mail: schnyder@wzw.tum.de

Publication History

  1. Issue published online: 25 OCT 2005
  2. Article first published online: 3 OCT 2005
  3. Received 18 April 2005; received in revised form 8 July 2005; accepted for publication 6 August 2005

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Keywords:

  • arbuscular mycorrhizal fungi;
  • Glomus hoi;
  • leaf elongation rate;
  • leaf growth zone;
  • Lolium perenne L.;
  • relative elemental growth rate

ABSTRACT

This study tested whether leaf elongation rate (LER, mm h−1) and its components – average relative elemental growth rate (REGRavg, mm mm−1 h−1) and leaf growth zone length (LLGZ, mm) – are related to phosphorus (P) concentration in the growth zone (PLGZ, mg P g−1 tissue water) of Lolium perenne L. cv. Condesa and whether such relationships are modified by the arbuscular mycorrhizal fungus (AMF) Glomus hoi. Mycorrhizal and non-mycorrhizal plants were grown at a range of P supply rates and analysed at either the same plant age or the same tiller size (defined by the length of the sheath of the youngest fully expanded leaf). Both improved P supply (up to 95%) and AMF (up to 21%) strongly increased LER. In tillers of even-aged plants, this was due to increased REGRavg and LLGZ. In even-sized tillers, it was exclusively due to increased REGRavg. REGRavg was strictly related to PLGZ (r2 = 0.95) and independent of tiller size. Conversely, LLGZ strictly depended on tiller size (r2 = 0.88) and not on PLGZ. Hence, P status affected leaf growth directly only through effects on relative tissue expansion rates. Symbiosis with AMF did not modify these relationships. Thus, no evidence for P status-independent effects of AMF on LER was found.

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