Japanese Knotweed Presentation
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Ty Oliver conducted a study on the allelopathic effects of compounds in Japanese knotweed rhizomes on fast plants. Rhizome extracts were made in varying concentrations and applied to fast plant seeds and seedlings, which were then measured for germination, height, and biomass. The results showed that the knotweed compounds inhibited fast plant growth, reducing height and biomass, but did not significantly affect germination. The concentration of the extract did not appear to influence the magnitude of these allelopathic effects.
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Japanese Knotweed Presentation
- 1. Ty Oliver Edgewood College May 2010
- 2. Can survive in areas beyond native range Adaptable Often aggressive Exotic or native species Reproduction
- 3. Large populations Compete for resources Replace or damage native species Resistance to pests and diseases http://www.aldertreegarden.com/images/DSCN0508.jpg
- 4. Fallopia japonica Polygonaceae family Perennial Herbaceous Native to Asia, specifically Japan, Taiwan, and northern China Commonly invades riparian areas and areas with recent disturbances http://shizuokagourmet.files.wordpress.com/2009/04/itadori- japanese-knotweed.jpg
- 5. Competition among plants via biochemicals Anthraquinones found in rhizomes Suspected to contribute to Japanese knotweed’s success as invasive http://www.languard.co.uk/invasive-weed- management/images/japanese-knotweed-rhizome.jpg
- 6. What effect would the compounds found in the rhizomes of Japanese knotweed on an organism like fast plants (Brassica rapa)?
- 7. The compounds found in the rhizomes of Japanese knotweed would have an allelopathic effect on fast plants. Inhibit germination and if germination were successful, stunt growth of fast plants in terms of height and biomass
- 8. Collected rhizomes Made extract from collected rhizomes Extract was made in varying concentrations ◦ ½ extract: 50mL extract + 50mL DI ◦ ¼ extract: 25mL extract + 75mL DI ◦ 1 /8 extract: 12.5mL extract + 87.5mL DI
- 9. 8 fast plants per group Control group: 5mL of DI added Experimental groups: ◦ 5mL ½ extract added ◦ 5mL ¼ extract added ◦ 5mL 1/8 extract added
- 10. 24-hour fluorescent lighting Grown in film canisters with potting soil and one pellet of fertilizer Final height was taken after flowering Number of seeds germinated Total biomass
- 11. The allelopathic compounds in Japanese knotweed rhizomes have an effect on the growth of fast plants in terms of plant height and biomass, but no significant effect was seen on germination.
- 12. 0 1 2 3 4 5 6 7 8 9 Control 1/2 Extract 1/4 Extract 1/8 Extract Seeds Number of Germinated Seeds
- 13. 0 5 10 15 20 25 30 35 40 Control 1/2 Extract 1/4 Extract 1/8 Extract Height(cm) Average Plant Height
- 14. 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 Control 1/2 Extract 1/4 Extract 1/8 Extract Weight(g) Biomass
- 15. Negative effect on plant height and biomass No significant effect on germination Concentration of extract doesn’t seem to matter