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This Concept Map, created with IHMC CmapTools, has information related to: Regulation of flowering in flowering plants (Class Concept Map), (1) Plants respond to exposure of relative day length, phytochrome exist in 2 forms Pfr, (2) leaves secrete florigen (flowering hormone), Short day plants (SDP) flowers when Pfr concentration is low, stimulates flowering in Long day plants (LDP), high level functions to stimulates flowering, Long day plants (LDP) flowers when Pfr concentration is high, flower buds & axillary shoots causes flowering in Short day plants (SDP), physiological response to the environmental by photoreceptors, Pr absorbs red light (660nm) DAY, Long day plants (LDP) flowers when day is longer than critical (night) maximum, inhibits flowering in Short day plants (SDP), phytochrome exist in 2 forms Pr, (1) Plants are grouped into Long day plants (LDP), Pfr degrades gradually during night to Pr, Pr is inactive form, Pfr absorbs far-red light (730nm), high level functions to inhibits flowering, flower buds & axillary shoots causes flowering in Long day plants (LDP), Short day plants (SDP) are Chrysanthemum, tobacco, strawberry, soya bean, rice