A study of total flavone contents on various organs of different Polygonum capitatum accessions

The variations of the total flavone contents on various organs of ten P.capitatum accessions native to Guizhou and Sichuan were studied by spectrophotometry,in order to search plants which contain higher contents of the total flavone in the accessions and their organs.The results showed that the differences of the total flavone contents among the different organs were great,the order of the total flavone contents was:old steminflorescenceyoung leafold leafyoung stem.There were significant differences of the total flavone contents in the old stems or inflorescences among ten accessions,and no significant difference in the other organs.The accession native to Dujiangyan contained the highest total flavone content(up to 2.761%),much higher than others.