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Lena Ström

Professor

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Organic acid mediated P mobilization in the rhizosphere and uptake by maize roots

Författare

  • Lena Ström
  • AG Owen
  • DL Godbold
  • DL Jones

Summary, in English

The exudation of organic acids into the rhizosphere by plant roots has been hypothesized to be one potential mechanism by which plants can enhance the mobilization of poorly soluble nutrients in the soil. The experiments undertaken in this study were aimed at determining whether the organic acids, citrate and oxalate, could enhance the uptake of P-33 from a calcareous soil with a high P fixation capacity (Typic rendoll). Soil-filled rhizosphere microcosms were constructed which allowed the growth of a single maize root axis through a (KH2PO4-)-P-33 labelled patch of soil. After passage of the root through the P-33-labelled soil, organic acids or distilled water (control) were added to the patch at concentrations of 1 and 10 mM over a subsequent 4-day period. While oxalate resulted in an approximately two-fold enhancement in shoot P-33 accumulation, citrate did not result in a significant enhancement of P-33 uptake above controls to which only distilled water were added. No synergistic effect on shoot P-33 accumulation was observed when both oxalate and citrate were added to the soil simultaneously. We hypothesize that the observed differences in shoot P-33 accumulation by the two organic acids were due primarily to the differences in their biodegradation rate and P mobilization reactions. This study demonstrates that in vivo, organic acids can cause a significant enhancement of plant P uptake, however, the magnitude of the P mobilization response is likely to be highly context dependent. (C) 2002 Published by Elsevier Science Ltd.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap

Publiceringsår

2002

Språk

Engelska

Sidor

703-710

Publikation/Tidskrift/Serie

Soil Biology & Biochemistry

Volym

34

Issue

5

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Ecology

Nyckelord

  • maize
  • rhizosphere
  • oxalate
  • citrate
  • phosphorus
  • organic acids
  • nutrient mobilization

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0038-0717