NaCl胁迫对光果甘草和苦豆子种子萌发的影响

Effect of NaCl Press on Seed Germination of Glycyrrhiza glabra and Sophora alopecuroides

试验研究了不同浓度的氯化钠对光果甘草(Glycyrrhiza glabra L.)和苦豆子(Sophora alopecuroides L.)种子萌发的影响进行了研究。研究结果表明:在不同浓度的NaCl条件下,光果甘草和苦豆子种子的发芽势、发芽率、发芽指数、活力指数和胚根胚芽生长长度均随着盐浓度的增加而下降。但在1.8%浓度时,光果甘草种子仍能保持60%以上的发芽率,而苦豆子种子发芽率只有4.8%。光果甘草种子发芽的最适盐浓度为1.6%,临界浓度为1.9%,极限浓度为2.4%。而苦豆子种子发芽的最适盐浓度为0.9%,临界盐浓度为1.2%,极限盐浓度为1.9%。光果甘草种子的发芽指数、活力指数和盐害指数迅速下降的浓度都比苦豆子高,而盐害率比苦豆子低很多。盐浓度提高到1.9%时,光果甘草种子的盐害率只有40.06%,而苦豆子的为100%,由此可看出,光果甘草的抗盐能力非常强,能适应含NaCl盐量高达1.8%的恶劣的生态环境。而苦豆子的抗盐能力相对较弱,只能适应含盐量为1.2%的土壤条件。对胚根胚芽生长来讲,在低浓度时NaCl盐对胚根胚芽生长的影响较小,浓度升高到1.2%以上,胚根胚芽生长受到严重影响,其中胚根生长受到影响较大。

This paper studied the seed germination of light fruit licorice（Glycyrrhiza glabra L.and Sophora（Sophora alopecuroides L.）under the different concentrations of NaCl.The result showed that seed germination rate,germination index,vigor index and length of radical,the growth of embryo of light fruit licorice and Sophora alopecuroides decreased with the concentration of NaCl increasing.But the seed germination rate of Glycyrrhiza glabra remained above 60% after being treated by the concentration of 1.8% NaCl and that of Sophora alopecuroides was only 4.8%.The critical concentration and the limit concentration were 1.9% and 2.4% for Glycyrrhiza glabra,respectively and 1.2% and 1.9% for Sophora.And seed germination index,vigor index and salt injury index of Glycyrrhiza glabra was higher than that of Sophora and salt injury rate was lower than that of Sophora.Salt damage rate of Glycyrrhiza glabra seed and Sophora seed were 40.06% and 100%,respectively.So,it showed that the seeds of Glycyrrhiza glabra was belong to the competence of the salt-tolerance and the extreme concentration was 1.8%.But it was poor for Sophora and the concentration was 1.2%.There was a little influence on the growth of radical and embryo under low concentration of NaCl,and it could affected badly the growth of radical and embryo above the 1.2% concentration of NaCl,especially for the former.