Abstract:

Dynamic changes of polyamine metabolism during flower formation in rape (Brassica Napus L.) were studied with three cultivars ‘Fuyou No.4’, RG-8 and its early-maturing mutant (RG-8M). The results showed that the lower levels of polyamines (mainly putrescine and spermidine) were benefit to induct floral bud differentiation of rape. The higher levels of polyamines were benefit for floral bud development. And what’s more, the earlier-maturing cultivar was earlier to reach the high level of polyamines. The PAO activity and the content of total polyamines in the leaves changed in parallel, and there was a significantly positive relationship between them. It showed that the higher PAO activity were also benefit for flowering.