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on wild-type Columbia plants (Sindelar et al. 2014). It is possible that sample size played a role in this result. Only 21 to 43 plants per category were used in these experiments, compared to the 52 to 78 wild-type plants used in the previously published study. That constant red and blue light does not tend to produce an exaggerated version of the red pretreatment’s effects, as compared to solely blue light, is interesting. Dark- grown Ler seedlings tended to react to the simultaneous red and blue light exposure as if it were only blue light, while Col and light-grown Ler under the red and blue treatment failed to significantly differ from either other treatment. These results suggest that red and blue light pathways interact with one another and generally operate at the same time, though Ler plants may favor the blue pathway in the presence of blue light. This effect is perhaps only seen in the dark-grown plants because etiolation often induces an exaggerated phototropistic response (Kang and Burg 1974). Lengths Red-light pretreatment of seedlings resulted in a reduction in root growth rate for all seedlings. In both of the other light treatments, roots in light-grown seedlings significantly outgrow etiolated roots. The red light pretreatment stunted shoot growth in dark-grown Ler seedlings, but did not cause differences in Col shoot growth, likely due to genetic differences between ecotypes. Under continuous blue-light treatment, dark-grown Ler shoots experienced increased growth rates, but this trend did not extend to light-grown seedlings. Col shoots, however, were unaffected. Blue light-treated Ler seedlings significantly outgrew their !xviiPDF Image | EFFECTS OF RED LIGHT ON BLUE LIGHT-BASED PHOTOTROPISM
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