野生狭叶荨麻种子形态与萌发特性的研究

以野生狭叶荨麻种子为材料,观测其外部形态和活力,分别采用15,20,25,30和35℃不同温度条件与50,100,300和500mg/L4种赤霉素浓度以及98%浓硫酸、35%氢氧化钠不同时间浸种,研究狭叶荨麻种子的萌发特性。结果表明,荨麻种子长958.72μm、宽534.85μm,当年收获的种子活力为83.25%,种子卵形,淡黄色,千粒重为0.1045g。最适萌发温度为25℃,发芽率为42.67%。用98％浓硫酸和35%的氢氧化钠处理,能提高其发芽率,酸蚀以5min、碱蚀以15min为宜,赤霉素浸种对发芽率无明显影响。

A study of germination characteristics and morphology of wild Urtica angustifolia seed

The aim of this research was to observe external morphology of Urtica angustifolia seed and detect seed vitality under different conditions. The wild U. angustifolia seeds were incubated at 15℃, 20℃, 25℃, 30℃, or 35℃, with 50, 100, 300, or 500 mg/L gibberellin, and with seed soaking in 98% concentrated sulfuric acid and 35% sodium hydroxide for different times. The length and width of U. angustifolia seeds were 958.72 and 534.85 μm. U. angustifolia seed vitality of those harvested in 2008 was 83.25%. U. angustifolia seed was yellow-gray, and the 1 000-seed weight was 0.104 5 g. The optimum germination temperature for U. angustifolia seeds was 25℃, which gave a germination rate of 42.67%. The seed germination rate was enhanced by soaking in 98% concentrated sulfuric acid for 5 min and 35% sodium hydroxide for 15 min, but gibberellin had no effect on germination rate.