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Study Questions

1. Name and briefly describe three important blue light responses in plants. Include in your description the characteristics of the action spectra of the responses

2. What is phototropin? Describe the properties and postulated role of phototropin in blue light-stimulated phototropism.

3. What is cryptochrome? Describe the properties and postulated role of cryptochrome in blue light-dependent inhibition of stem elongation.

4. Provide three lines of experimental evidence supporting a role of zeaxanthin in blue light-stimulated stomatal opening.

5. Describe in detail the sensory transducing cascade linking blue light photoreception in guard cells with blue light-stimulated stomatal opening.