Abstract: Five legume forages (Glycyrrhiza inflata, Glycyrrhiza pallidiflora, Oxytropis kansuensis, Oxytropis falcata, Oxytyopis imbricata) were investigated in this study. Different scarification methods (cutting seed coats or immersing seeds with 98% sulfuric acid) for breaking seed dormancy were used. Results indicated that both impermeability and mechanical barrier of seed coat were key factors limiting seed germination. The germination rates of Glycyrrhiza inflata and Oxytropis kansuensis seeds were significantly improved with cutting seed coats or immersing in 98% sulfuric acid. The germination rates of Glycyrrhiza inflata and Oxytropis kansuensi reached 69% and 75% after immersing 98% sulfuric acid for 20 min or 5 min, respectively. The highest germination rate (93%) in Glycyrrhiza pallidiflora was obtained with seed coat pierced. Cutting seed coat was the optimal breaking seed dormancy method for both Oxytropis falcata and Oxytyopis imbricata and the 78% and 77% germination rates were obtained, respectively. The optimal temperature was at 30℃ for Oxytyopis imbricata seed germination and under 20℃ for other four tested seeds germinations.

Key words: Leguminous forage, Seeds, Germination, Dormancy

摘要： 对胀果甘草(Glycyrrhiza inflata Batalin)、刺果甘草(Glycyrrhiza pallidiflora Maxim)、甘肃棘豆(Oxytropis kansuensis Bunge)、镰形棘豆(Oxytropis falcata Bge)和密花棘豆(Oxytyopis imbricata Kom)5种豆科牧草进行萌发特性研究,采用打破硬实的方法如划破种皮、98%浓硫酸对种子处理,以期探讨其适宜的发芽条件。结果表明:通过切破种皮和浓硫酸处理可以有效地解除种子硬实。胀果甘草和甘肃棘豆分别经过98%的浓硫酸处理20 min和5 min后,发芽率各自达到69%和75%(P<0.05);刺果甘草经过划破种皮,发芽率达到93%,是供试牧草种子中发芽率最高的;镰形棘豆和密花棘豆的适宜处理方法都是切破种皮,发芽率分别达到了78%和77%(P<0.01);对于5种牧草种子的温度条件,除了密花棘豆为30℃,其他4种均在20℃以下。

关键词: 豆科牧草, 种子, 萌发, 硬实