BIOL 1050 Lecture Notes - Lecture 21: Circadian Rhythm, Solar Tracker, Cryptochrome

• School: University of Guelph
• Department: Biology
• Course: BIOL 1050
• Professor: multiple

Document Summary

Blue light: cytochromes, cry1 cry2, regulate circadian rhythms, phototrophins, phot1 pho2, alter growth in response to light, zeaxanthin (a xanthophyll, stomatal opening, blue response limited to guard cells. Circadial rhythms: there are light and dark difference that follows a 24-26 hour cycle and the clock gets reset based on light signals of blue or red light signals, >30% circadian responses. If you set its form a high to dark it continues in that sequence, it has an internal clock, expressions are determined by where it is in circadian rhythm. Legumes: the leaves drop during night period, the hypothesis is to reduce the capture of moonlight. It may not take a lot of moonlight to trigger and offset a circadian rhythm: some city and urban lights have the same value as sunset light (light pollution) Perennial plants are sinks during depositions of reserved and sources during the regrowth an use of reserves.