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Module 1: Las hormonas de la planta y sus acciones

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XSIQ
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Biology - Photoperiodism

Photoperiodism

Petunias: long-day plants

* the flowering of many plants is geared to the length of the dark period
between periods of daylight

* long-day plants are those that flower if the period of uninterrupted
darkness is less than the critical length each day; for example, radishes,
spinach, clover, lettuce and petunias

* short-day plants are those that flower if the period of uninterrupted
darkness is more than the critical length each day; for example, dahlias,
potatoes, orchids and chrysanthemums

* day-neutral plants flower regardless of the length of darkness; for
example, tomatoes, snapdragon and geranium

This knowledge is made use of commercially to regulate life cycles and
flowering of many plants to meet periods of demand, such as for Mother's
Day!

Orchids: short-day plants

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