苦豆子种子萌发特性研究

Seed Germination Characteristics of Sophora alopecuroides L.

用NaCl和NaNO3处理苦豆子(Sophora alopecuroides L.)种子,以不同土壤类型和不同深度播种研究其萌发率、萌发指数、相对盐害率、胚根和胚轴生长及解除胁迫后生理指标的变化。结果表明:随着盐浓度的增加,苦豆子种子的萌发率、萌发指数、胚根、胚轴生长均呈下降趋势。低浓度NaCl和NaNO3(25～150 mmol.L-1)对种子萌发抑制作用不明显;高浓度的NaCl和NaNO3(>200 mmol.L-1)显著抑制种子萌发。盐胁迫解除后,萌发率随着原盐胁迫浓度的增加呈升高趋势。不同播种深度及土壤类型以1～3 cm沙土中生长较好,黑钙土、栗钙土次之,大于等于7 cm时则抑制其出苗。在同一深度条件下,出苗率表现为沙土>黑钙土>栗钙土。

Effects of NaCl and NaNO3 solutions as well as three soil types and sowing depth on seed germination of Sophora alopecuroides L.were measured.Results showed that seed germination rates,germination index as well as radicle and hypocotyl development decreased as the concentration of salt increased.The low concentration of NaCl and NaNO3（25~150 mmol·L-1） insignificantly inhibited seed germination,whereas the high concentration of NaCl and NaNO3（200 mmol·L-1） significantly did.The higher concentration of salt applied to seeds,the higher germination rates the seed had after terminating salt stress.In addition,seedlings grew very well in sandy soil when the seeds were sowed under 1~3 cm depth,whereas the seedlings could not emerge when sowing depth was 7 cm or more under tested soil types.Seeds had the highest germination rate when sown in sandy soil compared with those sown in chernozem and chestnut soil under the same sowing depth.