不同浓度的硫酸钠条件下光果甘草种子和苦豆子种子的萌发特性研究

Study on the Characteristics of Seed Germination of Glycyrrhiza glabra and Sophora alopecuroides Under the Condition of Different Concentrations of Sodium Sulfate

用不同浓度的Na2SO4对光果甘草种子和苦豆子种子萌发的影响进行了研究。结果表明:在不同浓度的Na2SO4条件下,光果甘草种子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。但在浓度为2.4%时,光果甘草种子仍能保持91.7%的发芽率,而苦豆子种子发芽率为0。光果甘草种子发芽的最适盐浓度为2.4%或2.4%以上,暂无临界浓度和极限浓度。而苦豆子种子发芽的最适盐浓度为1.8%,临界盐浓度为1.9%,极限盐浓度为2.4%。光果甘草种子的发芽指数和活力指数都比苦豆子种子高,而盐害率比苦豆子种子低。盐浓度提高到2.4%时,光果甘草种子的盐害率只有8%,而苦豆子种子为100%,由此可以确定,光果甘草种子抗Na2SO4盐的能力非常强,能适应含Na2SO4盐量高达2.4%以上的恶劣的生态环境。而苦豆子种子抗Na2SO4盐的能力相对较弱,只能适应含盐量为1.8%的土壤条件。对胚根胚芽生长来讲,在各浓度的Na2SO4盐条件下,胚根胚芽生长受到的影响都比较小,但胚根生长受到的影响比胚芽大。

It studied the effects of seed germination of Glycyrrhiza glabra and Sophora alopecuroides under the condition of different concentrations of sodium sulfate. The results showed that it decreased for germination power, the percentage of germination, germination index, vigor index and the growth length of radical and germ with the increase of concentration of sodium sulfate. But it remained 91.7% for Glycyrrhiza glabra and zero for Sophora alopecuroides at the concentration of 2.4% sodium sulfate. The optimization of sodium sulfate concentration was 2. d% or above, and this without critical concentration and limit concentration for Glycyrrhiza glabra. And it was the optimal concentration of 1.8%, 1.9% critical concentration and 2.4% of limit concentration for Sophora alopecuroides. And the germination index and vigor index of Glycyrrhiza glabra was higher than that of Sophora alopecuroides, but the rate of salt injury of Glycyrrhiza glabra was lower than that of Sophora alopecuroides. And the rate of salt injury of Glycyrrhiza glabra and Sophora alopecuroides were 8% and 100% at the 2.4% concentration of sodium sulfate, respectively. So ,it deduced that the competence of Na2SOa-resistance was stronger for Glycyrrhiza glabra and could adapt the hostile ecological environment of 2.4% concentration of sodium sulfate. But it was of poor competence of Na2SO4-resistanee and only apt to the 1.8% concentration of sodium sulfate. It was of lower effects on the growth length of radical and germ and the former was larger than the latter under different concentration of sodium sulfate.