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DISCUSSION Curvature Light-grown WT Landsberg seedlings exhibited greater shoot curvature after the red light pretreatment compared to the blue treatment, an effect seen in previous studies (Hangarter 1997, Sindelar et al. 2014, Whippo and Hangarter 2004). Interestingly, when Landsberg plants were germinated in darkness, less curvature was seen after the red light pretreatment compared to after the blue treatment. Etiolated Ler seedings under continuous red and blue light, however, exhibited shoot curvature that was statistically identical to the blue light treatment, bending more dramatically towards the light than the plants that received the red pretreatment. The red pretreatment appeared to inhibit phototropism in dark-grown Col WT stems verses continuous blue light, while the seedlings exposed to simultaneous red and blue light did not significantly differ from either of the other two treatments. Light-grown Columbia ecotype shoots did not significantly differ from one another, which contrasts with previous results in which the red pretreatment should have increased curvature in comparison to the blue treatment. There were no significant differences among root curvatures in any condition. This contrasts results reached by other studies, in which exposure to a red light pretreatment significantly reduced root curvature in wild-type Landsberg plants compared to exposure only to unilateral blue light irradiation, and had the opposite significant effect !xviPDF Image | EFFECTS OF RED LIGHT ON BLUE LIGHT-BASED PHOTOTROPISM
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