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Updated: Jul 7, 2026

Inoculation Strategies to Infect Plant Roots with Soil-Borne Microorganisms
Published on: March 1, 2022
Piriformospora indica affects plant growth by auxin production
Anke Sirrenberg1, Cornelia Göbel, Stephanie Grond
1Albrecht von Haller Institute for Plant Sciences, Department of Plant Biochemistry, Georg-August University Göttingen, 37077 Göttingen, Germany. asirren@gwdg.de
Abstract:
Piriformospora indica has been shown to improve the growth of many plant species including Arabidopsis thaliana, but the mechanism by which this is achieved is still unclear. Arabidopsis root colonization by P. indica was examined in sterile culture on the medium of Murashige and Skoog. P. indica formed intracellular structures in Arabidopsis root epidermal cells and caused changes in root growth, leading to stunted and highly branched root systems. This effect was because of a diffusible factor and could be mimicked by IAA. In addition, P. indica was shown to produce IAA in liquid culture. We suggest that auxin production affecting root growth is responsible for, or at least contributes to, the beneficial effect of P. indica on its host plants.
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