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In the mission of plant husbandry, light is a critical yet passive entity. The potential to actively implement dynamic lighting strategies to control plant growth and development holds great promise in the future of plant cultivation. In other words, rather than simply using a single stable light condition to maintain photosynthesis, might it be possible to continually adjust fluence rate, wavelength combinations, and photoperiods to actively manipulate plant morphology and production? Research over the past 100 years suggests that it is so, and today's solid-state, narrow bandwidth lighting platforms offer a unique opportunity to test this hypothesis. The goal of this report is to describe the potential use of light as a growth regulator. Here light-emitting diode technology is well suited for the application, because light quantity, quality, photoperiod, and combinations thereof can be controlled with great precision. Specific light combinations may be adjusted throughout the life of a plant to potentially optimize traits of interest such as synchronization of flowering, maintenance of vegetative growth programs, control of plant stature, or acceleration of juvenility. This report describes the plant photosensory networks and how they sense and respond to light. The connection between light and internal hormone stasis is explored and then extended to questions of designing specific regimes to control plant growth and development. The concept of static signaling states is presented as a means to tightly control plant habits, in essence, using light to stabilize plant signal transduction pathways and their associated outcomes. Finally, the concepts presented are applied to the diploid strawberry Fragaria vesca to demonstrate the usefulness of the approach. These experiments provide proof-of-concept and lay a foundation for further studies.

Light as a Growth Regulator: Controlling Plant Biology with Narrow-bandwidth Solid-state Lighting Systems