Allelopathic interference of annual ryegrass (Lolium rigidum) on lucerne nodulation

H. M. Zubair, J. E. Pratley, Graeme A. Sandral, AW Humphries, S. G. Nielsen, Andrew Price

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


    Summary Laboratory and glasshouse experiments were undertaken to evaluate the allelopathic effects of annual ryegrass (Lolium rigidum, ARG) root exudates against growth and nodulation of lucerne genotypes. This paper reports the outcomes of the nodulation investigation. The impact of ARG on lucerne nodulation was evaluated using SARDI Five and Titan 9 lucerne varieties (in both laboratory and glasshouse) at 6 rhizobium (Sinorhizobium spp) concentrations (0, 0.6, 1.5×10, 1.5×102, 1.5×103, 1.5×104 colony forming units/mL). At the highest rhizobium concentration, a fivefold reduction in nodule number was observed in the laboratory when lucerne genotypes were grown with ARG. Increasing annual ryegrass density also reduced nodulation under glasshouse conditions. The variability identified within and between lucerne populations suggests that there is scope to reduce allelopathic interference of ARG on seedling lucerne growth and improve the compatibility of these species in pasture mixtures at establishment.
    Original languageEnglish
    Title of host publicationProceedings 21st Australasian Weeds Conference
    EditorsStephen Johnson, Leslie Weston, Hanwen Wu, Bruce Auld
    Place of PublicationNSW, Australia
    PublisherWeed Society of NSW
    Number of pages4
    ISBN (Electronic)9780995415911
    Publication statusPublished - 2018
    Event21st Australasian Weeds Conference (2018) - Novotel Sydney Manly Pacific, Sydney, Australia
    Duration: 09 Sep 201813 Sep 2018 (conference proceedings) (conference program)


    Conference21st Australasian Weeds Conference (2018)
    Abbreviated titleWeed biosecurity - Protecting our future
    OtherThe Weed Society of New South Wales Inc., on behalf of the Council of Australasian Weed Societies Inc., will be hosting the 21st Australasian Weeds Conference in the popular Sydney beach side suburb of Manly from 9 - 12 September 2018.  An assortment of field trips will be hosted on Thursday 13 September 2018.
    This biennial conference carries on a long tradition of bringing the weed management community together to discuss new developments and share information about cutting-edge and best weed management practices.
    The conference attracts over 250 delegates from across Australasia and globally.  Delegates will come together to network with peers, engage with industry sponsors, listen and participate in presentations and field trips on a variety of topics including; 
    - New technologies in weed management.
    - Biological, mechanical, and chemical weed control and research.
    - Herbicide resistance.
    - Weeds of crops and pastures.
    - Environmental weeds and Weeds of National Significance.
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