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The Consequences of Various Metals on Seed Germination.docx

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BIOL 354
Julia Roberts

The Consequences of Various Metals on Seed Germination Sunny Kang ID 20369516Section 002PartnersVincent Wiemann and Eric Rivera TAs Anthon Baver Ryan ScottthDue June 18 2013thPerformed June 4 2013 7001030pmIntroduction This experiment was design to illustrate the effects of various metals on seed germination of wheat Triticum Aestivum and mung bean Vigna Radiata These seeds will be introduced to various concentrations of metals for a minimum of 96 hours The length of root and shoot of both seeds are measured afterwards and the effects of the metals on the germination of these seeds will be observed Metals such as Co Cd Cu and Pb are toxic to plants at significant concentrations and influence early seeding growth of plants Peralta et al 2001 Seed germination is sensitive to metal toxicants because of the lack of defense mechanisms Peralta et al 2001 therefore the observed seeds should have a lower percentage of germination as well as a lower rootshoot length when exposed to higher concentration of heavy metals The sensitivity of the germination depends on the type of metal as well as molecular mechanisms Copper is a micronutrient and they should have a lower impact on germination than lead which serves no biological benefits for plants Suhadolc et al 2004 Different seed types have different molecular mechanisms in order to defend against stressors such as the uptake and accumulation of metals through binding to extracellular exudates and cell wall constituents Suhadolc et al 2004 Seeds are a good bioassay because they can stay dormant and can be stored for long periods without being contaminated In addition seeds are smaller so that large numbers can be measures increasing the validity of the experiment However not all metals are mobile does not act toxic to plants in soil therefore the results acquired from the lab does not illustrate the natural consequences of the plant Peralta et al 2001 Heavy metal contamination is due to industrial agricultural and domestic pollution Metals do not degrade therefore they are easily accumulated in different parts of the good chain meaning that the it can have adverse effects to a many different species Oliveira A et al 2006
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