Complex Signaling Networks Underlying Blue-Light-Mediated Floral Transition in Plants.

Blue light (BL) is important in regulating floral transition. In a controlled environment production system, BL can be manipulated easily and precisely in aspects like peak wavelength, intensity, duration, and co-action with other wavelengths. However, the results of previous studies about BL-mediated floral transition are inconsistent, which implies that an in-depth critical examination of the relevant physiological mechanisms is necessary. This review consolidates the recent findings on the role of BL in mediating floral transition not only in model plants, such as , but also in crops, especially horticultural crops. The photoreceptors, floral integrator proteins, signal pathways, and key network components involved in BL-mediated floral transition are critically reviewed. This review provides possible explanations for the contrasting results of previous studies on BL-mediated flowering; it provides valuable information to explain and develop BL manipulation strategies for mediating flowering, especially in horticultural plants. The review also identifies the knowledge gaps and outlines future directions for research in related fields.