Unpublished conference/Abstract (Scientific congresses and symposiums)
Rhizobacterial volatiles influence root system architecture, biomass production and allocation of the model grass Brachypodium distachyon (L.) P. Beauv.
Delaplace, Pierre; Ormeño-Lafuente, Elena; Delory, Benjamin et al.
201510th International PGPR Workshop
 

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Keywords :
PGPR; Volatile compounds; Brachypodium; Root system architecture; rhizosphere
Abstract :
[en] Plant growth-promoting rhizobacteria are increasingly considered as a complement of conventional inputs in agricultural systems. Their effects on their host plants are diverse and include volatile-mediated growth enhancement. The present study aims at assessing the effects of bacterial volatile production on the biomass production and the root system architecture of Brachypodium distachyon (L.) Beauv. (line Bd-21). An in vitro experimental set-up allowing plant-bacteria interaction through the gaseous phase without any physical contact was used to screen 19 bacterial strains for their growth promotion ability over a 10-day cocultivation period. Using principal component analysis followed by hierarchical clustering and two-way analysis of variance, five groups of bacteria were defined and characterized based on their combined influence on biomass production and root system architecture. The observed effects range from unchanged to highly increased biomass production coupled with increased root length and branching. Primary root length was only increased by the volatile compounds emitted by Enterobacter cloacae JM22 and Bacillus pumilus T4. Overall, the most significant results were obtained with Bacillus subtilis GB03 which induced a 81% increase in total biomass and enhanced total root length, total secondary root length and total adventitious root length by 88, 196 and 473% respectively. The analysis of the emission kinetics of bacterial volatile organic compounds is underway and should lead to the identification of volatile compounds candidates responsible for the observed growth promotion effects. Taking into account the inherent characteristics of our in vitro system, the next experimental steps are identified and discussed from a fundamental and applied viewpoint.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Agriculture & agronomy
Author, co-author :
Delaplace, Pierre  ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Biologie végétale
Ormeño-Lafuente, Elena
Delory, Benjamin ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Biologie végétale
Baudson, Caroline ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Biologie végétale
Mendaluk-Saunier de Cazenave, Magdalena
Spaepen, Stijn
Varin, Sébastien
Brostaux, Yves  ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Statistique, Inform. et Mathém. appliquée à la bioingénierie
du Jardin, Patrick  ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Biologie végétale
Language :
English
Title :
Rhizobacterial volatiles influence root system architecture, biomass production and allocation of the model grass Brachypodium distachyon (L.) P. Beauv.
Publication date :
18 June 2015
Event name :
10th International PGPR Workshop
Event organizer :
Monica Höfte, Marc Ongena
Event place :
Liège, Belgium
Event date :
du 16 juin 2015 au 19 juin 2015
By request :
Yes
Audience :
International
References of the abstract :
Höfte M., Ongena M. (2015). Program and Abstract Book of the 10th International PGPR Workshop. Liège 16-19 June, 95 pp.
Available on ORBi :
since 14 July 2015

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