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This Concept Map, created with IHMC CmapTools, has information related to: Regulation of flowering in flowering plants edited, Short day plants (SDP) are Chrysanthemum, tobacco, strawberry, soya bean, rice, Short day plants (SDP) flowers when day is shorter than critical (night) maximum, leaves secrete florigen (flowering hormone), Long day plants (LDP) flowers when day is longer than critical (night) maximum, Pr converts readily during day to Pfr, flower buds & axillary shoots causes flowering in Short day plants (SDP), Long day plants (LDP) are spinach, lettuce, clover, Pfr degrades gradually during night to Pr, Pfr functions to stimulates flowering, Short day plants (SDP) flowers when Pfr concentration is low, physiological response to the environmental by photoreceptors, inhibits flowering in Short day plants (SDP), photochrome known as photoreceptors, Pfr is active form, Pr is inactive form, Pfr functions to inhibits flowering, stimulates flowering in Long day plants (LDP), Plants respond to exposure of relative day length, Long day plants (LDP) flowers when Pfr concentration is high, photochrome exist in 2 forms Pfr