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.
|Title of host publication||2010 Joint RACI and IUPAC, Chemistry for a Sustainable World|
|Place of Publication||Melbourne|
|Publisher||IUPAC/Royal Australian Chemical Institute|
|Number of pages||1|
|Publication status||Published - 2010|
|Event||IUPAC International Conference of Pesticide Chemistry - Melbourne, VIC, Australia|
Duration: 04 Jul 2010 → 08 Jul 2010
|Conference||IUPAC International Conference of Pesticide Chemistry|
|Period||04/07/10 → 08/07/10|
Weston, L. (2010). Bioactive Root Exudates: A Novel Source of Allelochemicals and Bioherbicides. In G. Simpson (Ed.), 2010 Joint RACI and IUPAC, Chemistry for a Sustainable World (pp. 1). IUPAC/Royal Australian Chemical Institute.