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Applied and Environmental Soil Science
Volume 2012 (2012), Article ID 307415, 4 pages
http://dx.doi.org/10.1155/2012/307415
Research Article

Control of Cultivable IAA-Producing Bacteria by the Plant Arabidopsis thaliana and the Earthworm Aporrectodea caliginosa

UMR Biogéochimie et Ecologie des Milieux Continentaux, Université Paris-Est Créteil Val de Marne, 61 Avenue du Général De Gaulle, 94010 Créteil Cedex, France

Received 2 April 2012; Revised 9 May 2012; Accepted 16 May 2012

Academic Editor: Marco Trevisan

Copyright © 2012 Ruben Puga-Freitas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Some soil microorganisms are involved in the complex interactions with plants and earthworms, through the production of indole acetic acid (IAA) which modifies plant growth and development. In a factorial experiment testing the impact of the presence/absence of plants and earthworms on IAA production by cultivable bacteria, we observed that plants were decreasing IAA production of 43%, whereas earthworms were increasing it of 46%. In the presence of both plant and earthworms, IAA production was as low as in the presence of plant control, showing that plants influence on IAA production by microorganisms prevails on earthworm influence. We discuss functional reasons which could explain this result.