干旱胁迫对苦豆子种子吸胀萌发和幼苗生长的影响

目的 研究干旱胁迫对苦豆子Sophora alopecuroides L. 种子吸胀萌发的影响及其幼苗抗旱性。方法 以苦豆子种子为实验材料，采用PEG-6000模拟干旱条件，测定种子吸胀速率、发芽率、种苗生长情况、组织相对含水量等指标。结果 随着胁迫程度的加剧，苦豆子种子吸胀速率、发芽率、发芽指数、生活力、苗高和根长、组织饱和含水量等指标均表现出明显降低的趋势，而苗干质量、根干质量和根冠比均呈先升后降的趋势。结论 苦豆子种子在适当的干旱胁迫下可以提高苦豆子幼苗的抗旱性，有利于培育壮苗。

Effect of drought stress on imbibition germination and seedling growth of Sophora alopecuroides

Objective To study the influence of drought stress on imbibition germination of Sophora alopecuroides and the drought resistance of its seedling. Methods To measure the imbibition rate, germination rate, germination index, seedling growth, and relative tissue moisture content under the drought stress by PEP-6000. Results With the increased level of stress, the imbibition rate, germination rate, germination index, vigor index, seedling hight, root length, and the relative tissue moisture content tended to decrease, while the seedling dry weight, root dry weight, and root-shoot ratio presented rising tendency then followed by the decrease. Conclusion The appropriate drought stress could improve the drought resistance of seedling, which is beneficial to cultivate strong seedling.