Smo has seven TM α helices, is a member of the GPCR superfamily, and is related in sequence to the Fz.

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#Id: 9850

#Unit 6. System Physiology – Plant

In the light, cry1 is activated directly by blue light and indirectly by blue lightinduced phosphorylation. Activated cry1 forms a complex with COP1 and SPA1 via the C-terminal domain, preventing them from degrading protein targets such as HY5

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#Unit 6. System Physiology – Plant

Both phytochromes and cryptochromes entrain the circadian clock in Arabidopsis.

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#Unit 6. System Physiology – Plant

Blue light depolarizes membrane of hypocotyl cells and inhibits of growth rate.

This membrane depolarization is caused by the activation of anion channels, which facilitates the efflux of anions such as chloride.

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#Unit 6. System Physiology – Plant

an anion channel blocker, NPPB (5-nitro-2-[4-phenylbutylamino]- benzoate), prevents the blue light–dependent membrane depolarization and decreases the inhibitory effect of blue light on hypocotyl elongation.

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#Unit 6. System Physiology – Plant

Phototropins (phots) are involved in directing organ, chloroplast, and nuclear movements, solar tracking, and stomatal opening

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#Id: 9855

#Unit 6. System Physiology – Plant

In Mougeotia, the photoreceptors regulating chloroplast movement consist of a fusion between phytochrome and a phototropin known as neochrome, and show typical bilin binding as well as red/far-red reversibility.