Abstract
The main route of adenine degradation in chlorophyll-deficient and variegated leaves of Pelargonium zonale (Geraniaceae) may be the over-all reaction path of oxidative purine catabolism. Only part of the supplied adenine is transformed into free guanine. Part of the 8- 14C-adenine supplied gives rise to serine- 14C. It is suggested that the imidazole ring of adenine or a metabolically related adenine derivative is opened and C-8 is lost as a single carbon unit which is used in serine biosynthesis, giving carbon-3 atom of serine.
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