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INTRODUCTION While plants cannot move from one location to another, they do have the ability to bend towards or away from environmental stimuli, such as sunlight or gravity, in order to better accommodate their needs. This response is called a tropism, defined as growth- mediated directional response to a stimulus vector (Kaufman and Song 1987; Whippo and Hangarter 2004). Multiple environmental stimuli are sensed by plants, and they respond accordingly. Though the phototropistic response is usually attributed to blue light, red light has been found to influence it as well (Correll and Kiss 2002; Kiss et al. 2003). When exposed to unilateral white light, phototropism occurs when the growth hormone auxin accumulates on the dark side of plant stems and induces growth on that side of the stem. This induction of growth results in curvature of the stem towards the source of light. Plants sense light through multiple photoreceptor proteins. Of these receptors, cryptochromes and phototropins sense blue light, while phytochromes sense red and far-red light. These photoreceptors mediate the plant’s responses to their environment by regulating the production and transportation of auxin molecules (Halliday et al. 2009). Though phototropism is typically associated with movement of the above-ground portion of a plant, it occurs in roots as well (Kiss et al. 2002). !viiiPDF Image | EFFECTS OF RED LIGHT ON BLUE LIGHT-BASED PHOTOTROPISM
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