Distinct leaf developmental and gene expression responses to light quantity depend on blue-photoreceptor or plastid-derived signals, and can occur in the absence of phototropins.

Abstract excerpt

Leaf palisade cell development and the composition of chloroplasts respond to the fluence rate of light to maximise photosynthetic light capture while minimising photodamage. The underlying light sensory mechanisms are probably multiple and remain only partially understood. Phototropins (PHOT1 and PHOT2) are blue light receptors regulating responses which are light quantity-dependent and which include the control...

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