The Phototropic Responses of Higher Plants

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Abstract
Some of the similarities and differences between the 4 phototropic systems reasonably well characterized for coleoptiles are summarized. Questions which remain unanswered are: Can the kinetic scheme described withstand rigorous experimental testing? Are systems I, II, and III really independent? What is the real nature of the red light effect(s) on phototropic sensitivity? Is system IV an auxin inactivation mechanism? What are the primary photochemical events for systems I, II, and III, and how do these mediate lateral transport? What is the chemical nature of the phototropic pigments? What role do light-growth reactions play in phototropic curvature? Finally, are the phototropic systems of dicotyledons homologous in any way with any of the systems found in coleoptiles? The bibliography consists of 101 references.