关键词: 四川牡丹, 休眠, 白菜, 保护酶, 抑制作用

Abstract: The effects of water crude extracts of the seed coat and endosperm of Paeonia decomposita on the seed germination，seedling growth and antioxidant enzymes of Brassica pekinensis were examined to understand the cause of seed dormancy of P. decomposita Hand.-Mazz. The results showed that the seed，especially the endosperm tissue of P. decomposita，contained substances that strongly suppressed seed germination. The crude extract of endosperm of P. decomposita，which significantly reduced the activities of catalase and peroxidase，and indirectly affected the activity of superoxide dismutase，showed a more significant inhibition than that of seed coat at the same dose. It was concluded that the presence of inhibitory substances is one of important causes of seed dormancy in P. decomposita.

Key words: Paeonia decomposita Hand.-Mazz., dormancy, Brassica pekinensis, protective enzyme, inhibiting effect