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Plant growth responses to supplemental far-red (FR) light exposure. (a) Mean (±SEM) stem height change and (b) mean (±SEM) number of new leaves produced by Solidago altissima plants growing under regular light conditions supplemented with FR light (reduced red:far-red ratio) or under regular (control) light conditions over one week. * Represent statistical differences (p < 0.001) based on a Student’s t-test.
