Bioactive Root Exudates: A Novel Source of Allelochemicals and Bioherbicides

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


    Plant root exudates are known to play an important role in community structure and are involved in complex rhizospheric interactions. Our past work with Sorghum spp. has elucidated the role of the allelochemical sorgoleone, a potent inhibitor of plant growth that is released in sorghum root exudates. Graminaecous species including fine fescue (Festuca rubra) also produce large amounts of novel secondary products and can selectively inhibit weeds in both field and laboratory conditions. These constituents are known to play important roles in plant defense against herbivores, insects, pathogens and microbes as well as competing plants. In Australia, Paterson's curse (Echium plantagineum) also produces unique root exudates from two types of root hairs, which are involved in active exudation processes in the plant. We have discovered that the epidermis of both its younger lateral roots and older taproots produce unusual, red- colored chemical constituents which are localized in the outer peridermal layers of its roots. Their identification and mode of action is currently under evaluation, as is their role in plant defense and invasion success.
    Original languageEnglish
    Title of host publication2010 Joint RACI and IUPAC, Chemistry for a Sustainable World
    EditorsGreg Simpson
    Place of PublicationMelbourne
    PublisherIUPAC/Royal Australian Chemical Institute
    Number of pages1
    Publication statusPublished - 2010
    EventIUPAC International Conference of Pesticide Chemistry - Melbourne, VIC, Australia
    Duration: 04 Jul 201008 Jul 2010


    ConferenceIUPAC International Conference of Pesticide Chemistry


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