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Phytochrome: Chemical and Physical Properties and Mechanism of Action

has been obtained. Likewise, substantial progress has been made in under­ standing the mechanism of action of phytochrome. The early hypothesis, that phytochrome played its primary role at some important metabolic crossroads, such as the metabolism of two- and three-carbon fragments ( 68 ) , has not aqueous buffer from dark-grown seedlings of Zea mays ( 29) , a large amount of biochemical, chemical, and physical information about this chromoprotein reversibility in etiolated plant tissue and the first isolation of the pigment into During the 13 years since the original detection of phytochrome photo­ chrome functions through gene activation (107 ) , draws its support from ex­ tensive physiological, developmental, and enzyme studies mostly with mus­ tard seedlings (Sinapis alba). A third recent hypothesis suggests that phyto­ been supported by more recent evidence. Another hypothesis, that phyto­ chrome acts in some way to affect membrane permeability ( 70) . The recent experimental evidence in support of this last hypothesis will be considered below. Because of low levels of phytochrome and difficulties of isolation, prog­ ress was relatively slow at first in characterization of the pigment. When Siegelman & Butler (156) reviewed the properties of phytochrome in the An­ http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews
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