碱性盐胁迫对光果甘草和苦豆子种子萌发的影响研究

Study on the Characteristics of Seed Germination of Glycyrrhiza glabra and Sophora alopecuroides under the Condition of Sodium

研究了不同浓度的碳酸钠对光果甘草和苦豆子种子萌发的影响。结果表明:在不同浓度的碳酸钠盐(Na2CO3)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Na2CO3浓度的增加而下降。但Na2CO3浓度提升到0.9%时,光果甘草种子还能保持73%的发芽率,而苦豆子种子发芽率只有26%。光果甘草种子发芽的最适Na2CO3浓度为0.9%,临界浓度为1.2%,极限浓度为2.1%。而苦豆子种子发芽的最适Na2CO3浓度为0.6%,临界浓度在0.6%和0.9%之间,极限浓度为1.8%。光果甘草种子的发芽指数和0.9%以上浓度的活力指数都比苦豆子高,而盐害率比苦豆子种子低很多。Na2CO3浓度提高到0.9%时,光果甘草种子的盐害率只有26.71%,而苦豆子种子的为70.28%,由此可以确定,光果甘草种子萌发抵抗Na2CO3盐的能力比苦豆子种子强,能适应含Na2CO3盐量达0.9%以上的恶劣的碱土生态环境。而苦豆子种子萌发抗Na2CO3盐的能力相对较弱,只能适应Na2CO3含量为0.6%的碱性土壤条件。

In this study, the effect of Na2 CO3 with different concentration on the seed germination of Glycyrrhiza glabra and Sophora alopecuroides were investigated. The results indicated that with the increasing concentration of Na2CO3, germinative force, germination percentage, germination index, vital index, radicle and germ length of Glycyrrhiza glabra and Sophora alopecuroides all declined. But the germination percentage of 73% in the Glycyrrhiza glabrain was much different from 26% in the Sophora alopecuroides under the condition of concentration of 0.9% in Na2CO3. The better growing concentration, critical concentration and maximum concentration of Na2CO3 for seed germination in the Glycyrrhiza glabrain was 0.9%, 1.2% and 2.1% respectively, but the above three concentration in the Sophora alopecuroides was 0.6% ,0.6% -0.9% and 1.8% respectively. Germination index and vital index for above the concentration of O. 9% in the Glycyrrhiza glabrain were higher than that in the Sophora alopecuroides, but the salt injury index in the Glycyrrhiza glabrain was much lower. Under the condition of the concentration of 0.9% in Na2CO3, the salt injury index were 26.71% （ Glycyrrhiza glabrain） and 70.28 % （Sophora alopecuroides） respectively, it suggested that the resistance to Na2 CO3 for the seed germination in the Glycyrrhiza glabrain was stronger compared with the Sophora alopecuroides, and the Glycyrrhiza glabrain was able to adapt to the bad Alkaline earth environment with the concentration of above 0.9% , but Sophora alopecuroides just for the concentration of 0.6%.