水分胁迫对牛心朴子植株生长及渗透调节物质积累的影响

Effects of water stress on the growing and accumulation of osmolyte of Cynanchum komarovii

采用PVC管种植模拟土壤干旱的方法,研究了牛心朴子 Cynanchumkomarovii 在水分胁迫下植株生长及渗透调节物质的积累情况.结果表明:牛心朴子植株地上部对土壤水分比较敏感,随水分胁迫程度的加强和胁迫时间的延长,植株生长显著变缓,直至停止生长,而根/冠比值则有所加大;可溶性糖是牛心朴子根系主要的渗透调节物质,随着土壤水分胁迫程度的加重,根系中的可溶性糖呈明显的增加趋势,叶中的可溶性糖则随胁迫的加重而呈下降趋势,说明在干旱胁迫下牛心朴子的同化产物大部分分配于根系之中;Pro在牛心朴子叶、茎、根的渗透调节中也起着重要作用,随土壤水分胁迫的加重,其在根、茎、叶中的积累明显增加;而无机离子在牛心朴子渗透调节过程中的作用很小.

The growth and osmolyte accumulation of Cynanchum komarovii was studied under water stress.Treatments were carried out in PVC tube to simulate drought.The results indicated that Cynanchum komarovii is sensitive to soil water from root to shoot,which apparently become slower and even stopped growing with water stress aggravation and the time of stress increase,but the rootshoot ratio increased.The soluble sugar is primary osmolyte in roots of Cynanchum komarovii,which increased markedly with water stress aggravation,while soluble sugar in leaves decrease.The results showed that assimilation of Cynanchum komarovii mostly distributed to root.The proline in roots,stems and leaves is also important osmolyte.They will accumulate markedly with water stress aggravation.But inorganic ion acted less in osmotic adjustment process of Cynanchum komarovii.