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blue-and-red treatment, though the red light pretreated cells (with the exception of etiolated Ler under blue light, which experienced enhanced growth as mentioned above) fell in the middle, failing to significantly differ from either other treatment. Landsberg seedlings experienced greater growth compared Columbia seedlings under blue light, but germination conditions determined whether the difference occurred in the roots or the shoots. Light-grown Ler roots outgrew light-grown Col roots, with no significant shoot length differences. Among dark-grown seedlings, Ler shoots outgrew Col shoots. Red light pretreatment prevented this effect; there were no significant differences among seedlings that received the pretreatment. Conclusions It is important to note that results of this study cannot necessarily be extended to other Arabidopsis strains or to other plants, as evidenced by various differences in shoot curvature and seedling lengths. Although Arabidopsis thaliana is a common model organism, this study, as well as previous ones, has demonstrated that different genotypes, even non-mutants, within the same species respond differently in experiments (Hangarter 1997, Kumar et al. 2008, Sindelar 2014). The attenuation by red light of root lengths in all conditions is intriguing considering red light’s ability to penetrate soil (Mo et al. 2015). Also, even though the results of these experiments did not reveal a significant connection between phototropic root curvature and red light pretreatment as previous experiments have revealed, there was an inhibitory effect regardless of etiolation or ecotype (Sindelar 2014). !xviiiPDF Image | EFFECTS OF RED LIGHT ON BLUE LIGHT-BASED PHOTOTROPISM
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