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Production of plant growth modulating volatiles is widespread among rhizosphere bacteria and strongly depends on culture conditions

Blom, D. and Fabbri, C. and Connor, E. C. and Schiestl, F. P. and Klauser, Dominik. and Boller, Thomas and Eberl, L. and Weisskopf, L.. (2011) Production of plant growth modulating volatiles is widespread among rhizosphere bacteria and strongly depends on culture conditions. Environmental Microbiology, 13 (11). pp. 3047-3058.

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Official URL: http://edoc.unibas.ch/46921/

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Abstract

Recent studies have suggested that bacterial volatiles play an important role in bacterialplant interactions. However, few reports of bacterial species that produce plant growth modulating volatiles have been published, raising the question whether this is just an anecdotal phenomenon. To address this question, we performed a large screen of strains originating from the soil for volatile-mediated effects on Arabidopsis thaliana. All of the 42 strains tested showed significant volatile-mediated plant growth modulation, with effects ranging from plant death to a sixfold increase in plant biomass. The effects of bacterial volatiles were highly dependent on the cultivation medium and the inoculum quantity. GC-MS analysis of the tested strains revealed over 130 bacterial volatile compounds. Indole, 1-hexanol and pentadecane were selected for further studies because they appeared to promote plant growth. None of these compounds triggered a typical defence response, using production of ethylene and of reactive oxygen species (ROS) as read-outs. However, when plants were challenged with the flg-22 epitope of bacterial flagellin, a prototypical elicitor of defence responses, additional exposure to the volatiles reduced the flg-22-induced production of ethylene and ROS in a dose-dependent manner, suggesting that bacterial volatiles may act as effectors to inhibit the plant's defence response.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Botanik > Pflanzenphysiologie Pathogenabwehr (Boller)
UniBasel Contributors:Boller, Thomas and Klauser, Dominik
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Blackwell
ISSN:1462-2912
e-ISSN:1462-2920
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Nov 2017 09:36
Deposited On:30 Nov 2017 09:36

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