Effects of GA3 and IAA on the germination of four species of Clematis seeds

The effects of different concentrations of IAA and GA3 treatments on the germination process of the seeds of Clematis brevicaudata,C.serratifolia,C.hexapetalaand,C.fusca were studied in this paper.The results showed that 20 mg·L-1 IAA treatment was optimal for C.brevicaudata whose germination rate was 83% and the mean germination time decreased by 4.6 days.20 mg·L-1 IAA and 5 mg·L-1 GA3 treatments were optimal for C.Serratifolia whose germination rate can reach 93.4% and 90%,respectively.The mean germination time of these two treatments for C.serratifolia decreased by 3 days and 2.3 days,respectively.500 mg·L-1 GA3 significantly increase C.Hexapetala and C.fuscas seed germination rate.The germination rate of C.hexapetala seed increased from the original 5.1% to 33.4%.The germination rate of C.fusca seed increased from the original 4% to 53.3% and the mean germination time decreased by 2 days.