Seed germination requirements and responses to desiccation and storage of Apterosperma oblata (Theaceae), an endangered tree from south-eastern China: implications for restoration

摘要

Apterosperma oblata H. T. Chang is an endangered species in the Theaceae, and although it reproduces by seed its germination requirements are not known. To provide basic information for conservation and restoration programs, we studied the effects of temperature, light, desiccation, and storage on the germination of A. oblata seeds under laboratory conditions. Optimal temperatures for seed germination were 15 and 20 degrees C. Photoperiod greatly affected final germination percentage, and constant darkness inhibited seed germination. Fresh harvested seeds had a high moisture content (56.4%), and they gradually lost their germination ability as dehydration occurred, suggesting that the seeds may be recalcitrant. Although short-term (2 months) dry storage at 4 degrees C increased the germination percentage, the overall trend was a considerable decline in germination percentage with an increase in storage duration at 4 degrees C and 20 degrees C. Since seeds are recalcitrant and easy to germinate at maturity, we recommend seedlings establishment rather than seeds for conservation and restoration programs of the species.