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Allelopathy in Plants: Is it Really There?

Allelopathy in Plants: Is it Really There?. Rachel French 9 th Grade. Problem. Are allelopathic effects present when various seeds are watered with alfalfa extract?. Research. Allelopathy is the competition of limited resources by plants

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Allelopathy in Plants: Is it Really There?

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  1. Allelopathy in Plants: Is it Really There? Rachel French 9th Grade

  2. Problem • Are allelopathic effects present when various seeds are watered with alfalfa extract?

  3. Research • Allelopathy is the competition of limited resources by plants • Comes from the Greek words “each other” and “sensitivity” • Competition takes one of two forms: • Exploitation • Interference • Reduces seed germination and seed growth • Reason why some plants cannot live together • Allelopathic chemicals can be present in all parts of the plant

  4. Hypothesis • If radish, seed rye, and rye grass seeds are separately watered with alfalfa extract, then there will be a negative effect on the germination of the seeds.

  5. Materials • 45mL alfalfa extract • Alfalfa sprouts • 45 mL water • 1 layer of cheesecloth • 45 mL distilled water • 1 roll of paper towels • 60 radish seeds • 60 seed rye seeds • 60 rye grass seeds • 18 petri dishes • 2 5-mL syringes

  6. Procedure • The alfalfa extract was made by straining a mixture alfalfa shoots and water • Each of the 18 petri dishes were labeled and lined with paper towels • 5 mL of either distilled water or alfalfa extract was added to each dish • The seeds were added to their respective petri dishes • The seeds were observed, observations were recorded, and statistics were calculated

  7. Procedure • Tested six times, either with alfalfa extract or distilled water • Independent variable = type of seed • Dependent variable = number of seeds germinated • Control variable = seeds tested with distilled water • Constants = location of the experiment, type of petri dish, the amount of liquid used with each dish, and elapsed time before observation

  8. Data Treatment Results

  9. Data

  10. Data Average Comparisons

  11. Data

  12. Conclusion • Hypothesis supported • More seeds germinated when watered with distilled water • Use a wider range of treatments • Measure germination at multiple points during experiment • Source are to follow

  13. Thanks • Thank you for listening to my presentation • I ask you to further your knowledge of my experiment with any questions

  14. References • Allaby, M. (2004). A Dictionary of Ecology. In Allelopathy. Retrieved November 8, 2009, from Encyclopedia.com website: http://www.encyclopedia.com/doc/1O14-allelopathy.html • Allelopathy. (2006, June). Allelopathy Journal. Retrieved November, 2009, from Allelopathy website: http://allelopathy-journal.com/allelopathy.aspx • Dailey, R. (2008, January 19). Allelopathy. Retrieved November 8, 2009, from Suite101 website: http://www.suite101.com/blog/bobcajun/allelopathy • Ferguson, J. J. (2009). What is Allelopathy? In Allelopathy: How Plants Supress Other Plants. Retrieved November 6, 2009, from Universtiy of Florida website: http://edis.ifas.ufl.edu/HS186 • A Study of Allelopathy in Plants. (2000). In Encouraging Student Biological Research (pp. 21-51). Jefferson City, MO: National Association of Biology . • Willis, R. J. (2007). Chapter 1. In The History of Allelopathy (pp. 1-14). Retrieved from http://books.google.com/books?id=C-nPBYjDAjYC&pg=PA3&dq=allelopathy+plants#v=onepage&q=allelopathy%20plants&f=false

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