Article (Scientific journals)
Identification of barley (hordeum vulgare L. SubSp. Vulgare) root exudates allelochemicals, their autoallelopathic activity and against bromus diandrus Roth. Germination
Bouhaouel, Imen; Richard, Gaetan; Fauconnier, Marie-Laure et al.
2019In Agronomy, 9 (7), p. 345-363
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Keywords :
Hordeum vulgare; allelochemicals; root exudates; phenolic acids; saponarin; weed management
Abstract :
[en] Crops with weed suppressive root exudates or the direct use of bioherbicidal allelochemicals is a new approach in integrated weed management systems. In this context, the allelopathic activity and chemical composition of root exudates from six genotypes (modern varieties and landraces) of barley were characterized. The phenolic acids appeared to be particularly implicated in the inhibitory action of barley root exudates against Bromus diandrus. The amount of these compounds was higher in sandy substrate than in sandy-clay-loam substrate. Ten phenolic acids and one phenylpropanoid derivative were present, in addition to saponarin, a newly identified flavonoid in barley root exudates. Seven compounds explaining variability in the inhibitory activity of barley roots (stepwise analysis) and one compound detected only in highly allelopathic genotypes were toxic against receiver plants. Most compounds had a greater inhibitory effect on the growth of great brome than the barley genotypes. The synergistic and/or additive effect of the eight compounds appeared to be the source of the toxicity. Benzoic acid, the mixture of compounds, saponarin and salicylic acid were the most effcient compounds against the great brome and the less aggressive against barley. Overall, the results revealed the allelopathic potential of the water-soluble compounds exuded by the roots of living barley plants. These compounds included saponarin, a flavonoid not yet recognized as a barley root allelochemical.
Disciplines :
Chemistry
Agriculture & agronomy
Author, co-author :
Bouhaouel, Imen 
Richard, Gaetan ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > SMARTECH
Fauconnier, Marie-Laure  ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Chimie des agro-biosystèmes
Ongena, Marc ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Microbial, food and biobased technologies
Franzil, Laurent 
Gfeller, Aurélie 
Hajer, Amara
du Jardin, Patrick  ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions végétales et valorisation
Language :
English
Title :
Identification of barley (hordeum vulgare L. SubSp. Vulgare) root exudates allelochemicals, their autoallelopathic activity and against bromus diandrus Roth. Germination
Publication date :
2019
Journal title :
Agronomy
eISSN :
2073-4395
Publisher :
MDPI AG, Switzerland
Volume :
9
Issue :
7
Pages :
345-363
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 August 2019

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