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

Hasan Muhammad Zubair, James Pratley, Graeme A. Sandral, AW Humphries, Sharon Nielsen, Andrew Price

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

Abstract

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
Subtitle of host publicationWeed Biosecurity - Protecting our Future
Place of PublicationSydney
PublisherWeed Society of NSW
Pages43-46
Number of pages4
ISBN (Electronic)9780995415911
Publication statusPublished - 2018
Event21st Australasian Weeds Conference 2018: Weed biosecurity - Protecting our future - Novotel Sydney Manly Pacific, Manly, Australia
Duration: 09 Sep 201813 Sep 2018
https://www.21awc.org.au/
http://caws.org.nz/old-site/awc_contents.php?yr=2018 (conference proceedings)
https://abercrombie.eventsair.com/QuickEventWebsitePortal/21awc/21awc-web/Agenda (conference program)
https://grdc.com.au/events/list/2018/09/21st-australasian-weeds-conference-sydney

Conference

Conference21st Australasian Weeds Conference 2018
Country/TerritoryAustralia
CityManly
Period09/09/1813/09/18
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.
Internet address

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