Stimulation of caffeine biosynthesis in suspension-cultured coffee cells and the in situ existence of 7-methylxanthosine

adenina adenine alcaloides de la xantina biochemistry biochimie biosynthese biosynthesis biotransformation caffeine cell culture chemical composition coffea arabica composition chimique cultivo in vitro culture de cellule culture in vitro guanosina guanosine in vitro culture inosine light luz plant growth substances purinas purine purines rubiaceae sustancias de crecimiento vegetal teobromina theobromine xanthine alkaloids