Analysis of swainsonine contents at various stages in Oxytropis ochrocephala

The main toxic swainsonine(SW) contents of Oxytropis ochrocephala in various plant parts at different stages were detected by gas chromatography (GC),the dynamic regulation of swainsonine was analyzed, the SW production of the whole grass aboveground part in O. ochrocephala per square metre was investigated and calculated.The results showed that the SW content of fruits was the highest, which was up to 107.787 mg·kg-1, the SW content in aboveground part at fruiting stage was the highest,which was up to 48.19 mg·kg-1. The averages of SW contents in different tissues at 4 period were podsflowersleavesstemsroot,the SW contents in aboveground part and the SW production of the whole grass aboveground part at four growth period were different which decreased in the following order: fruiting periodflorescence periodwithering periodbud formation period.