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This Concept Map, created with IHMC CmapTools, has information related to: Regulation of flowering, Long day plants (LDP) are spinach, lettuce, clover, photoperiodism view animation Phytochrome system, phytochrome exists in 2 forms Pfr, Pr converts readily during day Pfr, flower buds & axillary shoots causes flowering in Short day plants (SDP), physiological response to the environmental by photoreceptors, phytochrome exists in 2 forms Pr, photoperiodism controlled by night length, Short day plants (SDP) flowers when Pfr concentration is low, red light (660nm) is absorbed in form of Pr, stimulates flowering in Long day plants (LDP), Plants are grouped into Short day plants (SDP), Short day plants (SDP) flowers when day is shorter than critical period, photoperiodism view animation SDP & LDP, Pfr functions to stimulates flowering, florigen (flowering hormone) then transport to flower buds & axillary shoots, During the day ???? red light (660nm), Plants are grouped into Long day plants (LDP), Plants respond to exposure of relative day length, Pfr functions to inhibits flowering