Abstract: The seed biological characteristics of wild Cornus hongkongensis subsp. elegans were investigated, and the effects of different treatments with variable temperature, low temperature stratification and chemical agents on seed germination were compared. The results showed that the 1000-seed weight was 76.91 g, with average length of 5.81 mm, average width of 5.10 mm and average thickness of 3.99 mm. The water absorption of seeds was below 8% during the entire process of experiment, the existence of dense and hard seed coat affects the germination of seeds. Under the condition of variable temperature, 30 ℃/15 ℃ with large temperature difference could strongly promote germination of the seeds, germination time lag was shorter, germination percentage and germination energy were higher. The seeds of C. hongkongensis subsp. elegans were soaking in 30% NaOH for 10 min could greatly shorten the germination time of seeds. There was no significant difference in the germination results of seeds treated with low-temperature stratification at 4 ℃.

Key words: Cornus hongkongensis subsp. elegans, wild plant, biological characteristics, seed germination

摘要： 对野生秀丽四照花(Cornus hongkongensis subsp. elegans)种子的生物学特性进行观察测定，比较变温、低温层积、化学处理对种子萌发的影响。结果表明，秀丽四照花种子千粒重76.91 g，长5.81 mm、宽5.10 mm、厚3.99 mm。种子在整个试验过程中吸水率低于8%，说明有吸水性障碍的坚硬种皮抑制了种子萌发。变温条件下，温差较大的30 ℃/15 ℃处理对秀丽四照花种子萌发有较好的促进作用，萌发时滞短，萌发率和发芽势较高。秀丽四照花种子经30% NaOH浸泡10 min，可明显缩短萌发时间，但4 ℃低温层积处理对种子萌发没有显著效果。

关键词: 秀丽四照花, 野生植物, 生物学特性, 种子萌发