Effects of harvesting date and climate on the flavonoid and carotenoid contents of marigold (Calendula officinalis L.)

asteraceae calendula calendula officinalis carotenoide carotenoides carotenoids chemical composition clima climat climate compositae composition chimique cosecha flavonoide flavonoides flavonoids fleur flores flowers glicosidos glycoside glycosides harvesting harvesting date inflorescence inflorescences inflorescencias italia italie italy pigment pigmentos pigments quercetin quercetina xanthophylle xanthophylls xantofilas