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This Concept Map, created with IHMC CmapTools, has information related to: Regulation of flowering in plants edited, Pfr is active form, Short day plants (SDP) flowers when day is shorter than critical period, Plants are grouped into Short day plants (SDP), florigen (flowering hormone) then transport to flower buds & axillary shoots, Pfr concentration is high causes leaves, Pr is inactive form, Pfr functions to stimulates flowering, Plants are grouped into Long day plants (LDP), phytochrome exists in 2 forms Pr, flower buds & axillary shoots causes flowering in Short day plants (SDP), photoperiodism controlled by night length, Plants respond to exposure of relative day length, Long day plants (LDP) are spinach, lettuce, clover, Short day plants (SDP) are Chrysanthemum, tobacco, strawberry, soya bean, rice, Pfr concentration is low causes leaves, leaves secrete florigen (flowering hormone), exposure of relative day length known as photoperiodism, inhibits flowering in Short day plants (SDP), Long day plants (LDP) flowers when Pfr concentration is high, Pr converts readily during day Pfr