种荚预处理对红芪种子发芽特性的影响

采用去除果荚浸种、不去除果荚浸种荚和焖种荚等方法对红芪种子预处理12 h后再行发芽试验,以不去果荚不浸种干种荚为对照,旨在探寻改善红芪种子发芽特性的种子预处理方法。结果表明,春播季节20℃/18℃自然光照条件下,各处理红芪种子发芽率随发芽天数的动态变化均呈“S型”变化趋势,符合Logistic曲线方程。红芪种荚从置发芽床后第2~6天开始,种子先后启动发芽,第14~19天发芽陆续结束。整个发芽过程中,种子各发芽指标均表现出预处理间的显著差异性,预处理使红芪种子发芽提早1~4 d,发芽高峰持续期延长2 d。去果荚浸种12 h显著加快了种子发芽进程,焖种荚处理有效延长了发芽持续期。各处理发芽指标从高到低依次为去果荚浸种12 h(发芽率80.7%,发芽势54.0%,发芽指数7.083)>不去果荚焖种荚12 h(发芽率64.0%,发芽势13.3%,发芽指数3.462)>不去果荚水浸种荚12 h(发芽率48.0%,发芽势22.0%,发芽指数3.007)>对照干种荚(发芽率34.7%,发芽势4.0%,发芽指数1.865)。以上说明种荚果皮造成的吸水障碍是限制红芪种子发芽的主要因素,播种前将红芪种荚浸种12 h或焖种12 h再行播种均可显著改善红芪种子发芽特性,去除果荚后再浸种效果更佳,发芽率可达80.0%以上。

Effects of pod pre-treatments on the germination traits of Hedysarum polybotrys seeds

Plant pod seeds of Hedysarum polybotrys were used in a germination test in order to explore the effect of seed pre-treatment methods.Several methods,such as soaking the peeled seeds,and soaking and ste-wing the unpeeled seed pods for 12 h,were compared with non-soaked,dry seed pods as a control.Results un-der natural illumination at 18-20℃ showed that germination dynamics in all pre-treatments followed S curve patterns that fitted to a logistic equation.Germination started days 2 -6 and finished days 14 -19.The pre-treatments showed significant differences in germination traits.The peeled and soaking pre-treatment and the soaking and stewed unpeeled-seed pods pre-treatment delayed peak germination by two days.The peeled and soaking pre-treatment significantly expedited germination while the unpeeled and stewing pre-treatment pro-longed germination duration.All the pre-treatments for 12 h significantly improved germination quality com-pared with the control.The control had a germination rate of 34.7%,germination power 4.0% and germina-tion index 1.865.The results for the peeled and soaked seeds were 80.7%,54.0% and 7.083 respectively, that for the unpeeled stewed seed pods 64.0%,13.3% and 3.462 respectively.The results thus show that pre-treating seeds by soaking or stewing can significantly improve germination quality.Improvements were highest in the peeled pre-treatment,where seeds showed over 80% germination rate.