Based on the plant photobiology law, plant factories with intelligently-controlled light environment of LED light sources have developed rapidly, and they are regarded as the top patterns of modern protected horticulture. In this paper, the concepts of plant photobiology and plant light-quality biology and connotation are put forward, the developmental process of LED and its advantages in plant factory are summarized. Also, the fundamental roles of plant light-quality biology in high-efficient plant factory are highlighted. In the end, the current status and future research prospects are discussed.
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