Furthermore, our results show that none of the used chemicals influenced the formation of chlorogenic acid and other flavonoid classes exceps for anthocyanin and blush percentage (Fig. 1 and Table 1).This suggests independent regulation of different flavonoid classes and of chlorogenic acid, although they share the same biosynthetic pathway. This independent regulation has been observes befor (Awad et al., 2001) and might be caused by physical separation on the cellular level, as suggested by the apparent on-off mechanism in anthocyanin formation (Awad et al., 2000) or be the consequence of channeling through different multi-enzyme complexes (Burbulis and Shirley, 1999)