Allelopathy effects of Artemisia ordosica

The allelopathic effects of Artemisia ordosica on receptor plant species: Amaranthus tricolor,Orychopragmus violaceus,Raphanus sativus and Triticum aestivum was gaven.The aqueous extracted from aerial parts of A.ordosica causes inhibition on germination and decreases seedling and root elongation of receptor plants in vitro.The dry weight,seeding height and root length are reduced proportionally at various concentrations of the extracts.In different organic extracts of aqueous extracts,EtOAc extracts significantly inhibited the seedling and root elongation of receptor plants.This EtOAc extracts is separated into three parts.Through identification with chemical reactions,it was found that the bioactive fraction contained flavonoid compounds.