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• W2108730229 abstract "Here we provide a how-to-do-it model for exploring how a single species can adapt to a variety of climates and, potentially, become a new species. The project involves the use of ecotypes of Arabidopsis (Arabidopsis thaliana) and integrates biology, geography, earth sciences, and mathematics. Students will grow different ecotypes of Arabidopsis under different environmental conditions and measure fitness of the ecotype to each treatment. They are allowed to select all experimental conditions themselves including the ecotypes, the environmental conditions, and which growth parameters to measure. Students own the experiments and, therefore, are more excited about the outcomes. The project can be modified to use from middle school through college and fits nicely into modules on plant growth and development and/or evolution and speciation. It is driven by studentled experimentation and provides an opportunity for in-depth discussion of scientific methods and implementation of an experimental design. It also allows students to critically evaluate how environmental factors direct plant growth, development and reproduction and might lead to speciation. Arabidopsis is a member of the mustard family, a wild relative of such species as cabbage and radish. It is not a major agronomic plant species but offers important advantages to the research community. It is small plant that is easy to grow, with limited resources. Hundreds of plants can be grown in a 4 x 4 pot at room temperature with no special lights or growth conditions and can go from seed germination to seed harvest within six weeks. Because of its genetics characteristics, it has become the plant research model system (Somerville et al., 1985; Ausubel, 2000; Federspiel, 2000). It has the smallest genome of any known plant and was the first plant genome to be fully sequenced (Arabidopsis Genome Initiative, 2000). Arabidopsis self pollinates naturally but is easy to cross pollinate, produces thousands of seed per plant, and is easy to genetically modify. Literally, thousands of researchers around the world work with Arabidopsis on research relating to gene discovery, plant physiology, growth and development, and biotechnology. More recently, because of the variety of natural populations, it is gaining popularity with ecologists. Arabidopsis is also gaining popularity among teachers because of the vast resources and information available publicly. Most important for this project are the ecotypes available from around the world through the Arabidopsis Biological Resource Center (ABRC, Columbus, OH). Over 750 natural accessions (commonly referred to as ecotypes) of Arabidopsis have been collected from around the world, and information about seed purchase and growth conditions is freely available at the TAIR Web site (http://www. arabidopsis.org/). The ecotypes vary in traits such as leaf shape, flowering time, disease resistance, seed dormancy, etc. and are used by researchers around the world to uncover the genetic interactions such as those that underlie plant responses to the environment and evolution of morphological traits. The project exploits these ecotypes and variations to give students an opportunity to explore ecotypic differentiation and speciation as a scientific hypothesis. Ecotypic Differentiation as a Testable Hypothesis in Plant Speciation Speciation is the process of developing new species through evolution; plants or animals producing progeny that evolve over time to a point that they can no longer interbreed. Ecotypes, however, are subgroups within a species that have unique physical characteristics genetically adapted to particular environmental conditions. The development of ecotypes (ecotypic differentiation) could be viewed as an initial step toward speciation. The principle of ecotypic differentiation as a stage of speciation was first set forth by Turesson (1922) and later promoted by Clausen, Keck and Hiesey (1948). …" @default.
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• W2108730229 date "2007-10-01" @default.
• W2108730229 modified "2023-09-26" @default.
• W2108730229 title "<b>Arabidopsis Ecotypes:</b>A Model for Course Projects in Organismal Plant Biology & Evolution" @default.
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• W2108730229 doi "https://doi.org/10.1662/0002-7685(2007)69[477:aeamfc]2.0.co;2" @default.
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