Chapter 39: Control Systems in Plants. Question. Do plants sense and respond to their environment ? Yes - By adjusting their pattern of growth and development. In Dark. In Light. Comment. Plants can’t “move” away from a stimulus, but can change their growth response.
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4. Abscisic Acid
Flowering (some species).
Fruit development.Major Effects
2. Circadian Rhythms
2. Sleep Movements
Ex: Bean Leaves Prayer PlantTypes
1. Short - Day Plants
2. Long - Day Plants
3. Day - Neutral Plants
Pr- responds to 660nm (red light).
Pfr - responds to 730nm (far red).Phytochrome Forms
Sets clocks for plant responses.Photoperiodism
1. Developmental changes
2. Physiological changes