BIOL 211 – CELLULAR AND ORGANISMAL BIOLOGY
Lecture Outline for
Topic: phototropism (sensory systems in plants)
Chapter 29 sections 29.2, 29.3
Figures used in lecture: 29.7, 29.9, 29.10, 29.11, 29.12, 29.14, 29.15
– discussion of early experiments, including the phototropism work of
How Plants Move
Define/explain: tropism, phototropism, gravitropism, thigmotropism, nastic movements, thigmonasty, nyctinasty
Sensory System in Plants - Sensing Light
Define/explain: long-day plants, day-neutral plants, short-day plants, visible light, blue light, red light, far-red light, receptor, signal transduction, response
There are (at least) two separate photosystems in plants. One photosystem involves the plant’s response to blue light. The second photosystem controls the plant’s response to red and far-red light wavelengths.
You should be able to:
1. Explain the general aspects of phototropism.
2. Explain the difference between a long-day, day-neutral, and a short-day plant.
2. Explain the receptor and response for both of the blue light and red/far-red photosystems discussed in lecture.
3. Explain the basic process of signal transduction.