中性盐胁迫对乌拉尔甘草种子萌发的影响研究

Neutral Salt Stress Impacts on Seed Germination of Glycyrrhiza uralensis Fisch

本文研究了NaCl和Na2SO4不同浓度下两种中性盐胁迫对乌拉尔甘草种子萌发的效应。结果表明:≤280 mmol/L浓度的NaCl和≤240 mmol/L浓度的Na2SO4处理时,发芽率高于60%,高浓度的Na2SO4抑制种子发芽强于NaCl;不同浓度Na2SO4处理的发芽高峰期出现比对照早3～5天,比NaCl处理的早2～6天;Na2SO4处理种子的发芽势小于相同浓度的NaCl;中性盐胁迫浓度大于200 mmol/L时,种子发芽指数小于对照,NaCl溶液各梯度处理下的发芽指数均高于相应浓度的Na2SO4处理。发芽率、发芽势和发芽指数都与NaCl和Na2SO4浓度呈极显著负相关,发芽高峰期出现的天数与NaCl浓度呈正相关,与Na2SO4浓度呈负相关。

In this study,the effects of two kinds of neutral salt stresses on the seed germination of Glycyrrhiza uralensis Fisch were analyzed.The results showed that the germination rates were above 60% under ≤280 mmol/L concentration of NaCl or ≤240 mmol/L concentration of Na2SO4.High concentration of Na2SO4 inhibited seed germination more than NaCl.The germinations under Na2SO4 treatment were 3-5 days earlier than CK,and 2-6 days than NaCl treatment.Seed germination ability treated by Na2SO4 was less than NaCl under the same concentration,and seed germination index under NaCl treatment was higher than Na2SO4 under the same concentration.Significant negative correlations existed between germination rate,germination energy,or germination index and the concentration of NaCl or Na2SO4.Germination peak showed a positive correlation with the concentration of NaCl but a negative correlation with the concentration of Na2SO4.