Objective: To explore the optimum condition on germination of Millettia speciosa Champ, in order to provide guidance for seedling breeding, we studied the germination characters. Methods: Shapes, weights per thousand seeds and content of moisture were observed. The germination rates of the seeds were determined under different soaking time, different illumination and temperature treatments, and the correlation among them were measured. The difference of germination rate, germination index, numbers of initial germination and germination days were also compared. Results:The mean length and width of seeds were 1 042. 24 mm,925. 34 mm,respectively. Length to width ratio 1. 13. weights per thousand seeds was 45. 00 g and content of moisture was 2. 51%. Seeds under soaking time for 24 hours gained the highest germination rate when other conditions were the same. Germination rate under illumination was significantly higher than those under dark. With the increase of temperature, the germination rate raise firstly and then fell, and 25 - 30 ℃ was optimum. Different beds had influence on germination rate, while top of paper obtained the highest rate and index, the maximum numbers of initial germination and the shortest germination days. Conclusion;Top of paper, soaking time for 24 hours,25 ℃,illumination were the optimum condition for seed germination of Millettia speciosa Champ.%目的:研究牛大力种子萌发特性,找到种子萌发的最佳条件,为牛大力规范化、规模化种植提供种苗繁育途径和方法.方法:测定牛大力种子形态、千粒重和含水量,研究在不同浸种时间、不同光照、不同温度条件下的发芽率,并进一步比较它们之间的相关性,同时比较在不同发芽床培养下的发芽率、发芽指数、始发芽粒数和发芽天数的差异.结果:牛大力种子平均长度为1042.24 mm,宽度为925.34 mm,长宽比为1.13,百粒重平均为45.00 g,含水量为2.51％.在光照、温度等因素相同的条件下,种子浸种24h发芽率最高；在较适宜的浸种时间和温度条件下,种子在光照下培养的发芽率极显著高于在黑暗下培养的发芽率；随着温度的增加,种子发芽率先升后降,25～ 30℃最适合种子萌发；不同发芽床对牛大力种子发芽率有影响,纸上发芽率(92.00％)和发芽指数(15.78)均最高,且始发芽粒数最多(9粒),发芽所需天数最短(14.67 d).结论:在双层纸床上,浸种24 h,25℃,光照条件,最适宜牛大力种子的萌发.
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