Mutational analysis of blue‐light sensing in Arabidopsis

Blue light regulates many physiological and developmental processes in higher plants through the action of multiple photosensory systems. The analysis of photomorphogenic mutants is leading to a better understanding of how the different photosensory systems mediate the wide range of responses observed in blue light. A review of the current literature on photomorphogenic mutants makes it apparent that redundancies exist in photoreceptor function. For example, many blue‐light responses that have been shown to be regulated by a blue‐light photosensory system are also under phytochrome control. The study of various light‐response mutants suggests that a complex sensory network regulates light‐mediated responses. This article attempts to piece together information regarding the sensory systems responsible for blue‐light‐regulated responses.