The phytochrome protein

by alimasag The phytochrome is a protein with activity kinase present in green vegetables, whose function is to act as a photoreceptor primarily red light (600-700nm) and far-red (700-800nm), thanks to having a chromophore . Phytochrome in the type of detected light can trigger different responses in the plant, such as flowering , the germination , growth and escape response to the development of epicotyls shadow at night and during the day-cotyledons, regulation of expression metabolic activity during day and night ( circadian rhythms ). Phytochromes were discovered in the fifties as part of an investigation into the effect of light on the germination of seeds of lettuce . It was noted that they accounted for 20% seeds germinated in darkness, by contrast, the percentage of germination was maximum when irradiated seeds with a pulse of red light (R). We found also that subsequent irradiation with far-red light pulse (RL) canceling the inductive effect of red light, preventing germinati
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