Allelopathic potential of root exudates of annual ryegrass (Lolium rigidum)

R. Amini, Min An, James Pratley, S. Azimi

Research output: Book chapter/Published conference paperConference paperpeer-review

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Summary: A laboratory-based root exudates bioassay was conducted to assess the allelopathic potential of annual ryegrass against wheat using the equalcompartment- agar method. The effect of different growth period of ryegrass (2, 4, 6, 8, 11 and 15 days) on the allelopathic response of wheat was investigated. Results indicated that co-growth of annual ryegrass and wheat reduced the root and shoot length of wheat. Ryegrass growth for 6'8 days had the most inhibitive effect on wheat root growth. Increasing ryegrass density beyond 20 plants per beaker had no significant further effect on the allelopathic activity of annual ryegrass. To validate the allelopathic effect between ryegrass and wheat, activated charcoal was added to the growth medium (2% v/v) resulting in alleviation of the inhibition of wheat root and shoot length. Thus, the inhibition effect of annual ryegrass on wheat root and shoot length was chemically directed through its root exudates, with inhibition being greater on wheat roots than shoots.
Original languageEnglish
Title of host publication17th conference proceedings
Subtitle of host publicationNew Frontiers in New Zealand: Together we can beat the weeds
EditorsSue M Zydenbos
Place of PublicationNew Zealand
PublisherNew Zealand Plant Protection Society (Inc) 2010
Number of pages4
ISBN (Electronic)9780864762399
Publication statusPublished - 2010
EventAustralasian Weeds Conference (AWC) - Christchurch, New Zealand, New Zealand
Duration: 26 Sept 201030 Sept 2010


ConferenceAustralasian Weeds Conference (AWC)
Country/TerritoryNew Zealand


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