“…To avoid the complex influence of the blue light photoreceptor CRY1 on thermomorphogenesis 14,46 , we measured the daytime temperature response under continuous monochromatic R light 14,17 . Because thermomorphogenesis is mediated prominently by three bHLH transcription factors, PIF4, PIF5, and PIF7 [13][14][15][16] , we used pif4-2 and pif457 as negative controls. Among the three miRNA biogenesis mutants, only hyl1-2 showed a dramatic defect in the temperature response, comparable to that of pif4-2 (Fig.…”