NaCl胁迫下海滨锦葵种子萌发和幼苗生长过程的生理特性变化

以1／4 Hoagland溶液为基础培养液，研究了0．5％、1．0%、1．5％、2．0％和2．5％NaCl处理对海滨锦葵Kostelezkya rirginica（L．）Presl．]种子萌发和幼苗生长的影响，发现随着培养液中NaCl浓度的增加，海滨锦葵种子萌发率逐渐降低；当NaCl浓度达2．5％时种子不萌发，但NaCl胁迫解除后，种子的萌发率水平与对照相当。幼苗在含0．5％～1．0%NaCl的培养液中生长状况良好，叶绿素含量和根系活力明显增高；但当NaCl浓度达1．5％-2．0％时，叶绿素含量和根系活力逐渐下降；与对照相比，NaCl胁迫下幼苗的MDA水平降低。结果表明，NaCl胁迫对海滨锦葵种子萌发和幼苗牛长有一定的影响，但海滨锦葵可通过种子休眠、增加根系活力、降低体内MDA水平来缓解一定的盐害效应．以适应盐胁迫的生长环境．

Physiological characteristic changes during the process of seed germination and seedling growth of Kostelezkya virginica under the NaCl stress

Using 1/4 Hoagland as the basic culture solution,the status of seed germination and seedling growth of Kostelezkya virginica(L.) Presl.under 0.5%-2.5% NaCl stress was researched.With the increasing of NaCl concentration,the seed germination rate decreased gradually.The seeds treated by 2.5% NaCl did not germinated,but seeds still germinated and got similar germination rate as CK when NaCl stress was canceled.The seedlings growing in 0.5%-1.0%NaCl culture solution were much better than that in higher salt concentration,and had higher chlorophyll content and root system activity than CK,but got bad and chlorophyll content was reduced when seedlings cultured in 1.5%-2.0% NaCl solution.The MDA content of seedling was decreased under NaCl stress.In addition,the adaptation mechanism of K.virginica to NaCl stress was discussed.