TY - JOUR

T1 - Évaluation du potentiel allélopathique des composés hydrosolubles de l’orge (Hordeum vulgare L. subsp. vulgare) et du grand brome (Bromus diandrus Roth.) moyennant un bio-essai modifié

AU - Bouhaouel, Imen

AU - Gfeller, Aurélie

AU - Fauconnier, Marie Laure

AU - Delory, Benjamin

AU - Amara, Hajer Slim

AU - Du Jardin, Patrick

N1 - Funding Information: During this work, the first author was recipient of a PhD fellowship of the Erasmus Mundus Averroès Partnerships Action of the European Commission. This work was funded by internal grants of Gembloux Agro-Bio Tech, University of Liège. Publisher Copyright: © 2016, FAC UNIV SCIENCES AGRONOMIQUES GEMBLOUX. All rights reserved.

PY - 2016/6/16

Y1 - 2016/6/16

N2 - Description of the subject. The present study focuses on the description of the allelopathic interactions between wild and crop species that may occur in a given ecosystem. Objectives. The objective is the evaluation of the allo- and autoinhibition activity of root exudates of barley (Hordeum vulgare L. subsp. vulgare) and great brome (Bromus diandrus Roth.) seedlings by water-soluble allelochemicals. Method. The allelopathic activities of five Tunisian barley genotypes (modern varieties and landraces), one Saudi Arabian barley landrace and great brome were assessed using a modified laboratory bioassay named “seedling-after-seedling agar method”. Results. The barley or the great brome reduced, to a greater extent, the root growth compared to the shoot growth of receiver species. The response of the root system architecture of the great brome towards barley root exudates was studied in detail. All the measured root traits were highly sensitive to the presence of barley. In our conditions, the allelopathic activity of barley root exudates had no apparent relationship with the size of the root and a prominent action of genetic determinants in the allelopathic potential between genotypes is proposed. The alloinhibitory activity of barley or great brome root exudates deferred between the receiver species but was always higher than the autoinhibition potential. The autoinhibition in barley proved to depend on whether the genotypes used as donor and receiver are identical or different, suggesting a specific interaction of allelochemicals with the receiver plant. These molecules seem to be the main actors in the allelopathic barley potential as external factors such variations of pH have no evident relevance in the inhibition process. Conclusions. Barley and great brome exude molecules in their surroundings. This affects the growth of the receiver plants, suggesting that these compounds might contribute to the plant community dynamics.

AB - Description of the subject. The present study focuses on the description of the allelopathic interactions between wild and crop species that may occur in a given ecosystem. Objectives. The objective is the evaluation of the allo- and autoinhibition activity of root exudates of barley (Hordeum vulgare L. subsp. vulgare) and great brome (Bromus diandrus Roth.) seedlings by water-soluble allelochemicals. Method. The allelopathic activities of five Tunisian barley genotypes (modern varieties and landraces), one Saudi Arabian barley landrace and great brome were assessed using a modified laboratory bioassay named “seedling-after-seedling agar method”. Results. The barley or the great brome reduced, to a greater extent, the root growth compared to the shoot growth of receiver species. The response of the root system architecture of the great brome towards barley root exudates was studied in detail. All the measured root traits were highly sensitive to the presence of barley. In our conditions, the allelopathic activity of barley root exudates had no apparent relationship with the size of the root and a prominent action of genetic determinants in the allelopathic potential between genotypes is proposed. The alloinhibitory activity of barley or great brome root exudates deferred between the receiver species but was always higher than the autoinhibition potential. The autoinhibition in barley proved to depend on whether the genotypes used as donor and receiver are identical or different, suggesting a specific interaction of allelochemicals with the receiver plant. These molecules seem to be the main actors in the allelopathic barley potential as external factors such variations of pH have no evident relevance in the inhibition process. Conclusions. Barley and great brome exude molecules in their surroundings. This affects the growth of the receiver plants, suggesting that these compounds might contribute to the plant community dynamics.

KW - Ecosystems Research

KW - Allelopathy

KW - Bromus diandrus

KW - Hordeum vulgare

KW - pH

KW - root exudates

KW - root systems

UR - http://www.scopus.com/inward/record.url?scp=85006091091&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/3be12a23-4b9f-30a8-8fee-29198f65b3d0/

U2 - 10.25518/1780-4507.13303

DO - 10.25518/1780-4507.13303

M3 - Journal articles

AN - SCOPUS:85006091091

VL - 20

SP - 482

EP - 494

JO - Biotechnologie, Agronomie, Societe et Environnement

JF - Biotechnologie, Agronomie, Societe et Environnement

SN - 1370-6233

IS - 4

ER -