浸种温度对红芪(Hedysarum polybotrys)种子发芽的影响

Effects of Soaking Temperature on Seed Germination Characteristics of Hedysarum polybotrys

采用初始温度不同的水浸红芪(Hedysarum polybotrys)种荚12h,然后发芽,以不浸种为对照,旨在探寻提高种子发芽质量的预处理方法,为规范化生产提供科学依据。结果表明:红芪种子发芽率进程符合Logistic方程,浸种荚对红芪种子发芽特性具有极显著影响。与对照比较,在20~80℃的水中自然冷却浸种12h均不同程度改善了种子发芽特性。随水温的提高,种子发芽质量先提高后下降;当水温为60℃时发芽质量最佳,发芽率、发芽势和发芽指数分别达80.7%、34.7%和4.994,较对照发芽率34.7%、发芽势4.0%和发芽指数1.865分别增加46.0%、30.7%和3.128;但当水温达80℃时,发芽质量出现下降趋势,但仍显著高于对照和20℃水浸处理的水平。60℃热水浸种12h可软化红芪种荚,增强种子吸水吸胀能力,并稀释降低发芽抑制物,有效提高种子出苗质量和育苗成效。水浸种预处理还可有效精选种子,但经浸种后的种子需拌土小心播种,严防机械损伤。

In order to explore a better pretreatment method to improve the sprouting quality and provide a scientific basis for good agricultural production of Radixhedysari,a seed germination experiment was done after soaking the seed pods of the medical plant in different initial temperatures of water for 12 husing the non-soaking pod seeds as the control.The result showed that the dynamics of germination rate of the plant seeds showed'S'type curve pattern,fitting to Logistic equation.The soaking pretreatments in different initial temperatures of water for 12 hhad great effect on the germination properties of the pod seeds of the plant compared with the control.The germination characteristics were significantly improved in pretreatments of the soaked pod-seeds in hot water at 20-80 ℃for 12 hcooling down spontaneously,respectively.The germination rate of the seeds without shelling increased at first but decreased afterwards with the soaking water temperature rising.The best germination quality for the seeds was found in the soaking pre-treatment in water at 60 ℃,in which the germination rate,germination power and germination index were 80.7%,34.7% and 4.994,which increased by 46.0%,30.7% and 3.128,respectively compared with the corresponding control values(34.7%,4.0%and 1.865).However,when the temperature of water was up to 80℃,the sprouting quality began to be inferior,but still higher than the levels of the control seeds and the pretreatment seeds soaked at 20℃.All above indicated that the soaking pretreatment of the seeds without shelling in hot water at initial temperature of 80 ℃for 12 hcould improve the germination rate and the sprouting quality resulted in setting up good foundation for cultivating health seedlings and improving seedling-culturing benefit.The seed pretreatment soaking in water before sowing also contributed to the seed choiceness effectively ensuring the seed quality for sowing.However,when sowing the soaked seeds attention must be paid to taking strict precautions against various seed damage.