Plant Structure, Function, and Use

Plant Responses to Stimuli

What are turgor movements?

Turgor movements in plants are often reversible and are caused by changes in what is called the “turgor pressure” in specific cells. For example, some plants exhibit different flower positions during the day than at night, such as morning glories and four o’clocks; others, such as clovers and some beans, often display different leaf positions from day to night. One of the main reasons for the leaf reactions is changes in the internal water pressure, usually found in tissue at the base of leaflets. One of the more well-known turgor movements is with a Venus flytrap, which grabs an insect that touches the plant’s leaf (trap). This is the result of a turgor movement from rapid changes in cellular water in the plant, allowing the plant to close and digest its prey.


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