Photoperiod - Length of day - an environmental cue used to elicit seasonal plant responses such as flowering, Long-day Plant (LDP) - Needs a long day (short night) to flower), Short Day Plant (SDP) - Needs a short day (long night) to flower, Day Neutral Plant  - Flowering is independent of day length, Critical photoperiod - The length of the day above which long day plants will flower and and below which short day plants will flower, Phytochrome - Pigment controlling the photoperiod response in plants, Pr - Form of phytochrome - phytochrome red, Pfr - Form of phytochrome - phytochrome far red, Location of phytochrome - found in the leaves of plants and if a single leaf is exposed to the correct photoperiod, this can stimulate the release of hormones, causing the whole plant to flower., The phytochrome switch - Neither form of the Phytochrome directly stimulates flowering, the two forms act as a switch stimulating the release of a hormone that induces flowering.,

Photoperiodism in Plants

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