A Closer Look at Plant Reproduction, Growth, and Ecology by Britannica Educational Publishing

Author:Britannica Educational Publishing
Language: eng
Format: epub
Publisher: Britannica Educational Publishing
Published: 2012-10-15T00:00:00+00:00

PHOTOPERIODISM

The rates of plant growth and cell differentiation vary from one season to the next. Plants are sensitive to the relative lengths of alternating periods of darkness and light, which change with the seasons. This property is called photoperiodism. Depending on the seasonal lengths of day and night needed for blossoming, plants are divided into spring-, summer-, and fall-blossoming groups. Skunk cabbage, for example, is one of the earliest blooming spring plants in the northern United States. It requires longer nights than does the wild rose, which blooms three months later. Barley, wheat, and many other small grains blossom in early summer when the nights are relatively short, whereas corn, soybeans, and chrysanthemums bloom later, in midsummer and fall, when the nights are longer.

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