Polyamines (PAs) are involved in various developmental processes, especially plant flowering. Their significant influences have been established; however, the exact mechanism by which PAs regulate flowering remains unclear. To explore PA metabolism flowering, gibberellic acid (GA3, 0~2400 mg L?1) and spermidine (Spd, 0~1 mM) were applied alone or combination during early stage of flower bud for...

The activity of ornithine decarboxylase (EC 4.1.1.17) increased in confluent cultures of glioma C6BU-1 cells 3 h after adding a complete serum-containing medium, and was maximal 5 h later. The activity of S-adenoxyl-L-methionine decarboxylase (EC 4.1.1.50) increased soon after addition of the complete medium to the cells, and reached its peak after 11 h. The activity of diamine oxidase (EC 1.4....