TY  - BOOK
AU  - Suzuki,T.
AU  - Takahashi,E.
TI  - Caffeine biosynthesis in Camellia sinensis
KW  - CAMELLIA SINENSIS
KW  - THEACEAE
KW  - TEA
KW  - BIOSYNTHESIS
KW  - PURINE METABOLISM
N2  - The metabolism of adenine and guanine, relating to the biosynthesis of caffeine, in excised shoot tips of tea was studied with micromolar amounts of adenine-[8-14C]or guanine-[8-14C]. Among the presumed precursors of caffeine biosynthesis, adenine was the most effective, whereas guanine was the least effective. After administration of a 'pulse' of adenine-[8-14C], almost all of the adenine-[14C]supplied disappeared by 30 hr, and 14C-labelled caffeine and RNA purine nucleotide (AMP and GMP)synthesis increased throughout the experimental period, whereas the radioactivities of free purine nucleotides, 7-methylxanthine and theobromine increased during the first 10 hr incubation period, followed by a steady decrease. By contrast, more than 45
UR  - https://drive.google.com/file/d/1EwklGtNIFnNnq329aUIf9-ib27mxlnae/view?usp=drivesdk
ER  -