Light and Plant Growth

5.

5.1.

Definition of Phototropism

5.2.

Types of Phototropic Responses

5.2.1.

Positive Phototropism

5.2.2.

Negative Phototropism

5.3.

The Mechanism of Phototropism

5.3.1.

Perception of Light Direction by Phototropins

5.3.2.

The Role of Auxin

5.3.2.1.

Redistribution of Auxin

5.3.2.2.

Differential Cell Elongation

5.3.3.

Differential Growth of Cells

5.3.3.1.

Bending of Stems

5.3.3.2.

Bending of Roots

5.4.

Experimental Evidence for Phototropism

5.4.1.

Historical Studies

5.4.2.

Modern Research Methods

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6. Photoperiodism