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Lemna Proposal

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Introduction

Lemna Proposal Background: Lemnaceae is a family of flowering plants, which is also known as the duckweed family. These plants are very simple, lacking an obvious stem or leaves, but consist of a small thalloid, or "plate-like structure that floats on or just under the water surface, with or without rootlets" (Dickinson). Lemna (Duckweed) growth is found to be strongly reduced by unicellular green algae (Dickinson). It is known that algae can grow under 350-500 nm and 600-700 nm of wavelength. So if these wavelengths are blocked, then algae will not be able to grow; thus they will not take up much of the nutrients that the lemna need. Since algae need blue light to make their own food and survive, the compliment of the color blue (brownish) will be added to the pond water inhibiting algae growth (Freeman). By testing how certain wavelengths can inhibit algae growth, which is in competition with lemna, competition with the algae for nutrients can be reduced for the lemna. ...read more.

Middle

Materials Needed: * 20 lemna cups * Lemna * 20% pond water * Algae * Yellow, red, and green food coloring Literature Cited: Dickinson, Matthew B., and Thomas E. Miller. "Competition among small, free-floating, aquatic plants." The American Midland Naturalist. 140.n1 (July 1998): 55(13). Expanded Academic ASAP. Gale. Fairfield University. 19 Oct. 2008 <http://find.galegroup.com.libdb.fairfield.edu/itx/start.do?prodId=EAIM>. Freeman, Scott. Biological Sciences. University of Washington; Pearson Education, Inc: 2008. Annotated Bibliography: Artetxe, U., Hernandez, A., and Garcia-Plazaola, J. "Do light acclimation mechanisms reduce the effects of light-dependent herbicides in duckweed (Lemna minor)?" Weed Science. 2006: 230-6. 21 Oct. 2008. <http://vnweb.hwwilsonweb.com. libdb.fairfield.edu/hww/results/getResults.jhtml?_DARGS=/hww/results/ results_common.jhtml.20>. This article discusses how different light intensities affects lemna's biological mechanisms to adapt to the light. Cheng, J, L. Landesman, B.A. Bergmann, J.J. Classen, J.W. Howard and Y.T. Yamamoto. "Nutrient removal from swine lagoon liquid by lemna minor 8627." Transactions of the Asae. 2002, vol 45,pp. 1003-1010. <http://apps.isiknowledge.com/ full_record.do?product=WOS&search_mode=GeneralSearch&qid=6&SID =3A81AEO866bPMeA8A61&page=1&doc=3>. ...read more.

Conclusion

Academic OneFile. Gale. Fairfield University.19 Oct. 2008 <http://find.galegroup.com.libdb.fairfield.edu/itx/start.do?prodId=AONE>. This article is about the structure of lemna and its development. It explains how it grows and the different parts of the plant. Paul C. Marino, "Ecological competition", in AccessScience@McGraw-Hill, <http://www.accessscience.com,DOI 10.1036/1097-8542.757554>. This article is about plant competition and species coexistence. It talks about how competition is one of the most important forces structuring ecological communities. Young, D.L.W., M.D. Wiegand, N.L. Loadman, S.A. Collins, A.J. Ballevona, and J.D. Huebner. "Effects of artificial ultraviolet-B radiation on growth and fatty acid composition of duckweed (Lemna minor). (Author abstract)." Freshwater Biology 51.11 (Nov 2006): 2029(12). Academic OneFile. Gale. Fairfield University. 21 Oct. 2008 <http://find.galegroup.com/itx/start.do?prodId=AONE>. This article is about Duckweed (Lemna minor) and how it was collected in the summer and early fall and was exposed under laboratory conditions to control (photosynthetically active and UV-A radiation) and experimental (control plus UV-B radiation) conditions. Growth and survival were determined by counting the number of green, and brown/white fronds following 1-5 or 11 days of irradiation. Growth of duckweed was impaired by exposure to UV-B radiation in the fall experiment but not in the summer. ...read more.

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