ECON 2010 Lecture 3: Section 3: Plant Behavior
3 Apr 2016
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Document Summary
Bending, twisting, or rotating (nutation) sometimes rapid. Others slower as they grow and develop. Travel from one location to another in a plant. Allow plants to respond to environmental stimuli. Plants respond to both physical and biological stimuli. Stimuli may be generated internally or come from the environment. Physical: light, atmospheric gases (such as co2), humidity, temperature, touch, wind, gravity, water, rocks, soil minerals. Biological: herbivores, airborne pathogens, organic chemicals from other plants, (beneficial or harmful) soil microbes. All these environmental influences affect plant survival and reproduction. Receptor molecules located in plant cells sense stimuli and cause responses. Phototropism the tendency of a plant to grow toward a light source involves both a cellular perception of light and a growth response of stem tissue to an internal chemical signal (the plant hormone auxin) Process by which a cell perceives a physical or chemical signal. Switching on an intracellular pathway that leads to a cellular response.
