Long day plant
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A long day plant is a plant that requires fewer than a certain number of hours of darkness 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.
Examples of long day plants:
Obligate requirement:
Carnation (Dianthus sp.), Henbane (Hyoscyamus sp.), Oat (Avena sp.), Ryegrass (Lolium sp.), Clover (Trifolium sp.). Bellflower (Campanula carpatica)
Facultative (quantitative requirement):
Pea (Pisum sativum), Barley (Hordeum vulgare), Lettuce (Lactuca sativa), Wheat (Triticum aestivum, spring wheat cultivars), Turnip (Brassica rapa).
See also
References
Fosket, D.E. Plant Growth & Development, A Molecular Approach. Academic Press, san Diego, 1994, p. 495.
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