%0 Journal Article %A YE Ying %A LIU Zhigao %A LIANG Lijun %A JI Mengcheng %T Effects of 137Cs-γ Rays Irradiation on Germination and Seedling Growth of Clematis chinensis %D 2020 %R 10.11869/j.issn.100-8551.2020.08.1621 %J Journal of Nuclear Agricultural Sciences %P 1621-1630 %V 34 %N 8 %X In order to cultivate Clematis chinensis species, the seeds of Clematis chinensis were used as experimental materials to conduct radiation treatment with different dose (0, 50, 100, 150, 200 Gy) of 137Cs-γ rays the influence of radiation on seed germination and seedling growth of Clematis chinensis were studied. The results showed that 50 Gy could promote seed germination and seedling formation. The LD50 of Clematis chinensis was found to be 109.5 Gy. After radiation treatment, 7 kinds of mutation in leaf shapes were appeared including the heart shape, among which 50 and 100 Gy treatment induced the most mutation, with five and four types respectively. Seedling height, tiller number, ground diameter and internode length decreased with the increase of radiation doses. With the increase of radiation doses, relative chlorophyll content decreased, Fv/Fm, Fv/Fo and ETR overall increased first and then decreased, reaching the maximum value at 50 Gy. Higher radiation doses inhibited the activity of the photosynthetic system. qPincreased with the increase of radiation doses. Both of ETR and NPQ showed a downward trend with the increase of radiation doses, dectreased to the lowest at the treatment of 100 Gy. Experiments showed that, the seedlings irradiated by 50-100 Gy rays have rich variations in morphology, proportion of variation, high quality growth and well-performed photosynthetic system. Considering LD50of Clematis chinensis, the appropriate doses range of 137Cs-γ irradiation for Clematis chinensis breeding is 50-109.5Gy. The result provided a scientific basis for radiation breeding in Clematis. L. %U https://www.hnxb.org.cn/EN/10.11869/j.issn.100-8551.2020.08.1621