Impacts of Host Trees and Sowing Conditions on Germination Success and a Simple Ex Situ Approach to Generate Symbiotic Seedlings of a Rare Epiphytic Orchid Endemic to Hainan Island, China

文献类型： 外文期刊

第一作者： Yang, Fu-Sun

作者： Yang, Fu-Sun;Zhu, Jie;Song, Xi-Qiang;Yang, Fu-Sun;Sun, Ai-Hua;Zhu, Jie;Song, Xi-Qiang;Downing, Jason;Liu, Hong;Downing, Jason;Downing, Jason;Liu, Hong;Liu, Hong;Liu, Hong

作者机构：

关键词： Dendrobium sinense;Seed germination;Mycorrhizal fungi;Host trees

期刊名称：BOTANICAL REVIEW （ 影响因子：3.083； 五年影响因子：3.825 ）

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收录情况： SCI

摘要： For species relying on seeds for population regeneration, knowledge on seed germination behaviors in relation to environmental factors is critical in designing species recovery strategy. Dendrobium sinense is an orchid endemic to Hainan Island of China and listed as Endangered by the IUCN Redlist. It reproduces primarily via seeds in its natural habitat. However, how germination is impacted by major environmental factors is poorly known. This study aimed to examine germination success of D. sinense seeds using two approaches, i.e. in situ and ex situ, using host tree barks as germination media. The latter was intended to generate symbiotic seedlings in a simple and economic approach which could be used for reintroduction efforts. In addition, three factors of in situ symbiotic seed germination success, including different sowing time, location (distance from an adult plant), and host tree were investigated. Our results showed that seeds sown ex situ and in situ in July had the highest rates of germination. Seed germination was significantly higher ex situ using bark as medium than in situ. Seeds sown directly on Rhododendron moulmainense, the most common host tree, with naturally occurring conspecific orchids had the highest rate of germination. In contrast, ex situ seeds sown on the bark of Cyclobalanopsis blakeii, a non-host species, had the highest rate of seed germination. In situ a positive correlation was found between the seed germination rate and the distance of the seeds from the adult D. sinense. Based on these results, it is likely seedling recruitments are determined by host tree species, the presence of and the distance from an adult conspecific orchid, which imply the importance of the mycorrhizal fungi, which were not reported here. This study provided important information on the optimal environmental conditions for population augmentation and reintroduction, which can be used as part of the species recovery strategy.

分类号： Q94

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