摘要
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 rootshoot 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.
出处
《西北植物学报》
CAS
CSCD
2003年第4期592-596,共5页
Acta Botanica Boreali-Occidentalia Sinica
基金
科技部生物工程中心 863 领域项目
973 G1999011704 项目
宁夏回族自治区自然科学基金 C229 资助