BIOL 260 Lecture Notes - Lecture 18: Electrochemical Gradient, Mica, Amyloplast
Document Summary
Discuss how phytochromes enable plants to detect photoperiod length. Sn plants need relatively high pfr:pr ratio at sunrise to flower. Ln plants need a low ratio of pfr:pr. At sunrise, the plant checks the ratio in order to flower (multiple sunrises allows a plant to flower) If a flask of light is placed in the middle of a might, it can change the flowering patterns of a plant. If a red light is placed in the middle of the night, the long night plant is not going to flower b/c the ratio of pfr:pr is too high, however a sn plant will flower b/c the ratio of. Red light and far red light determines whether or not the plant will flower. Describe the mechanisms of phototropism and the role of auxin in this process. Explain the cell elongation process in the context of the acid growth hypothesis. Describe the mechanisms of gravitropism and the role of auxin in this process.
