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草业学报  2015 

种荚预处理对红芪种子发芽特性的影响

DOI: 10.11686/cyxb2014274, PP. 159-167

Keywords: 预处理,红芪种荚,去皮浸种,焖种荚,发芽特性

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Abstract:

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12h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1~4d,发芽高峰持续期延长2d。去果荚浸种12h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12h(发芽率80.7%,发芽势54.0%,发芽指数7.083)>不去果荚焖种荚12h(发芽率64.0%,发芽势13.3%,发芽指数3.462)>不去果荚水浸种荚12h(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12h或焖种12h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。

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