title: Kinetically distinguishable populations of phytochrome.
abstract: Two or more kinetically distinguishable populations of phytochrome molecules were observed in living tissues of oat, pea, maize, and cauliflower, as well as in extracts of oat. At least 3 different populations occurred in cauliflower florets, while 2 were observed in each of the other species. In extracted oat phytochrome, the relative proportions of the 2 forms remained constant during successive stages of purification. The physiological significance of this multiplicity of forms remains unclear.
authors.affiliation: The Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138.
authors.forename: W K
authors.initials: WK
authors.lastname: Purves
authors.forename: W R
authors.initials: WR
authors.lastname: Briggs