Abstract
Biosynthesis of chlorophyll (Chl) is closely associated with other processes of plant metabolism, of which the most important is protein biosynthesis. The latter supplies the enzymatic apparatus necessary for the construction of new Chl molecules and the carrier on which pigment molecules are mounted. It is known that the control of Chl biosynthesis takes place to a considerable degree at the stage of formation of δ-aminolevulinic acid (ALA). In many cases the formation and regulation of the activity of ALA synthetase is a key point in the whole process (GRANICK 1959; LASCELLES 1959; MARSH et al. 1963; SISLER & KLEIN 1963; KLEIN & BOGORAD 1964, KALER & PODCHUFAROVA 1965; SCHIFF & EPSTEIN 1965). However, Chl biosynthesis may be regulated in a more complex way, and, in particular, it may be carried out by a multienzyme complex, chlorophyll-synthetase, and may be directed both through changes in the number of acting centres of Chl biosynthesis and through changes within the centres (SHLYK et al. 1969a).
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