中国特有珍稀植物伯乐树种子的类型和贮藏

Seed Category and Storage of Bretschneidara sinensis,a Rare Endemic Plant in China

伯乐树(Bretschneidara sinensis)是我国特有的单种科植物,被列为国家一级重点保护野生植物。本试验研究了伯乐树种子的类型和贮藏方法,结果表明:伯乐树种子对脱水敏感,当相对失水率大于50%后即丧失萌发能力,但对低温(4～5℃)并不敏感,属于典型的中间性种子。低温下一定湿度的沙藏(含水率8%～12%)优于其它贮藏方法,但并不能长期在低温下贮藏,最长的贮藏时间也仅为1年左右。说明伯乐树种子为短命型种子,每年需采集新的种子以补充种子库。

Bretschneidara sinensis is a monotypic species endemic in China and is classified in National Key Protected Wild Plants （First Group）. The seed category and storage measure were studied in this study, results showed that seed of Br. Sinensis was sensitive to dehydration, and the seed would lost germination ability after the relative dehydration rate was lower than 50%. Whereas it was not sensitive to low temperature （4 ℃ to 5 ℃ ）, consequently it was typical intermediate seed. Although the germination rate of seeds which were kept in sands （MC 8% - 12% ）under low temperature was higher than other storage conditions ,the seeds could not be preserved for a longtime under low temperature, and the storage period was no longer than 52 wk （about 1 year）. So Bretschneidara sinensis belonged to whort life type seeds and the fresh seeds must be collected to supply the seed bank.