Long day plant

From Wikipedia, the free encyclopedia

A long day plant is a plant that requires less than a certain number of hours of night in each 24 hour period to induce flowering. Long day plants typically flower in the late spring or early summer.

Plants use the phytochrome system to sense daylength or photoperiod.

[edit] Examples of long day plants:

Obligate requirement:

• Carnation (Dianthus sp.),
• Henbane (Hyoscyamus sp.),
• Oat (Avena sp.),
• Ryegrass (Lolium sp.),
• Clover (Trifolium sp.).

Facultative (quantitative requirement):

• Pea (Pisum sativum),
• Barley (Hordeum vulgare),
• Lettuce (Lactuca sativa),
• Wheat (Triticum aestivum, spring wheat cultivars),
• Turnip (Brassica rapa).

[edit] See also

• Florigen
• Photoperiodism
• Phytochrome

[edit] Reference

Fosket, D.E. Plant Growth & Development, A Molecular Approach. Academic Press, san Diego, 1994, p. 495.