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Related Experiment Video

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Kinematic Analysis of Cell Division and Expansion: Quantifying the Cellular Basis of Growth and Sampling Developmental Zones in Zea mays Leaves

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Leaf closure in the venus flytrap: an Acid growth response.

S E Williams, A B Bennett

Science (New York, N.Y.)

|December 10, 1982

Summary

This summary is machine-generated.

Venus flytrap leaf closure requires cell wall acidification. Acid growth, driven by rapid hydrogen ion transport using adenosine triphosphate, causes irreversible cell enlargement for rapid trap closure.

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Area of Science:

Plant biology
Biochemistry
Mechanobiology

Background:

The Venus flytrap (Dionaea muscipula) exhibits rapid leaf closure.
This closure involves irreversible cell enlargement.

Purpose of the Study:

To investigate the role of cell wall pH in Venus flytrap leaf closure.
To elucidate the underlying mechanism of rapid cell enlargement.

Main Methods:

Infiltration of Venus flytrap leaves with acidic and neutral buffers.
Measurement of leaf closure response to trigger hair stimulation.
Analysis of cellular adenosine triphosphate (ATP) levels during closure.

Main Results:

Acidification of cell walls to pH 4.50 and below initiated rapid leaf closure.
Neutral buffers (pH 4.50-4.75) prevented closure despite action potential generation.
Approximately 29% of cellular ATP was consumed during the 1-3 second closure period.

Conclusions:

Cell wall acidification is a critical trigger for Venus flytrap leaf closure.
The process likely involves an "acid growth" mechanism, utilizing ATP for rapid hydrogen ion transport.
This mechanism drives the irreversible cell enlargement necessary for rapid trap closure.