Etiolation

Etiolation [ Botany - Horticulture ]	Dictionary of botanic terminology - index of names
Adjective: Etiolated

A phenomenon exhibited by plants grown under low light intensity or in complete darkness: An abnormal increase in stem elongation, accompanied by poor or absent leaf development.

Physiological etiolation is caused by a lack of chlorophyll, and is typical of plants growing under low light intensity or in complete darkness. It can also be caused by disease. Etiolated plants are pale yellow and have spindly growth with long internodes, small leaves and spines.

Etiolated plants are structurally weaker, possess less resistance to sunburn. Etiolated plants (eg. plants overwintered indoor or cultivated under dense sunscreen ) need to be gradually accustomed to the direct sun exposure over a one-week to one month period. If the unveiling occurs too rapidly the etiolated shoots will suffer severe sunburn.

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