盐胁迫对东北藿香种子萌发的影响
Journal of Chinese Medicinal Materials(2019)
Abstract
目的:探讨3种单盐胁迫对东北藿香种子萌发特性的影响,明确种子萌发阶段和幼苗生长阶段对3种单盐胁迫的耐受性.方法:以东北藿香种子为试材,采用不同浓度Na2SO4、NaHCO3和Na2CO3盐溶液处理其种子,测定发芽率、发芽势、发芽指数、活力指数、苗高、胚根长等指标,并通过建立的函数方程确定东北藿香种子对3种单盐的耐受值.结果:3种盐胁迫处理的发芽率、发芽势、发芽指数和活力指数均随其盐浓度的升高而显著下降;苗高和胚根生长受抑;东北藿香种子萌发阶段和幼苗生长阶段对Na2SO4、NaHCO3和Na2CO3的耐受阈值分别为64.71、36.68、15.95 mmol/L和98.06、18.78、5.27 mmol/L.结论:东北藿香种子萌发阶段和幼苗生长阶段对3种单盐胁迫均具有一定的耐受性,其对3种单盐的耐受性依次为Na2SO4>NaHCO3>Na2CO3.
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