镰荚棘豆种子破除休眠及活力改善方法研究

目的打破镰荚棘豆Oxytropis falcata种子的休眠,提高种子活力。方法测定种子形态特征、物理特性,采用物理、化学方法,进行种子硬实破除,应用外源化学物质,改善种子活力。结果镰荚棘豆种子千粒质量为1.239g,种子的硬实率高达90.67%,用浓硫酸处理8 min破除种子硬实后,再用激动素(CTK)+KNO_3组合处理进行种子引发,种子的发芽率高达82.7%,发芽势达68.0%,发芽时间比对照提前2 d。结论用浓硫酸处理8 min后,用170 mg/L的CTK处理12 h,再在2%KNO_3中浸泡12 h,可大幅度提高种子的发芽率和整齐度。

Study on method of breaking dormancy and improving vitality in seeds of Oxytropis falcata

Objective To break the dormancy of Oxytropis falcata seeds and improve the seed vigor. Methods The physical and chemical methods were used to break the hard seeds, and the exogenous chemicals were used to improve the seed vigor. Results The 1000-seed weight was 1.239 g, and the seed hardiness rate was as high as 90.67%. After 8 min of treatment with concentrated sulfuric acid, the seeds were activated by CTK + KNO₃ combination. The germination rate was up to 82.7%, the germination potential was up to 68.0%, and the germination time was 2 d earlier than the control group. Conclusion After treated with concentrated sulfuric acid for 8 min, treated with 170 mg/L CTK for 12 h, then soaked in 2% KNO₃ for 12 h, the germination rate and uniformity of seeds can be greatly improved.