Abstract

FANG, Yan; ENHE, Zhang; QINLI, Wang  and  ZHUHONG, Mao. Germination and dormancy-breaking of Daphne giraldii Nitsche (Thymelaeaceae) seeds from northwestern China. Rev. Chapingo ser. cienc. for. ambient [online]. 2016, vol.22, n.1, pp.99-113. ISSN 2007-4018.  https://doi.org/10.5154/r.rchscfa.2015.04.015.

Daphne giraldii Nitsche (Thymelaeaceae) is a perennial evergreen shrub that is widely used in the ornamental plant and pharmaceutical industries in China. It exhibits dormancy, which delays and reduces germination. This study determined the effects of chemical treatment, stratification and burial treatment for overcoming the seed dormancy of D. giraldii. Results showed that chemical pre-treatment was less effective in breaking dormancy. The best germination percentage (GP) was 52.33 %, a germination rate (GR) of 1.19 only observed after 70 d of seed stratification at 5 °C treatment, indicating that the germination behavior of D. giraldii was not significantly affected by stratification. The physiological dormancy of D. giraldii seeds was alleviated during burial. Seeds buried at 100 cm depth for 170 days showed the highest germination success with GP of 86.5 % and GR of 10.11, which was the most effective treatment to alleviate seed dormancy. This information may be useful to restore and conserve other shrubs grown in Northwestern China and elucidate their survival under similar extreme environments.

Keywords : Stratification; gibberellic acid; 6-benzyladenine; burial; germination capacity.

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