草业学报2013，Vol.22Issue(4)：116-122,7.DOI:10.11686/cyxb20130414
盐胁迫对砂蓝刺头不同器官中离子分布的影响
Effects of salt stress on ion distribution in different Echinops gmelini organs
摘要
Abstract
Echinops gmelini is an annual wild plant distributed in arid desert areas of North China.The changes of water content,Na+,Cl-,Si4+,K+,Ca2+ contents and the K+/Na+,Ca2+/Na+,Si4+/Na+ ratios were measured in E.gmelini seedlings in a water control and under different concentrations (100,200,300,400 mmol/L) of NaCl stress:the water contents were found to increase by 9.86％,1.41％,4.23％,and 8.45％,respectively.Therefore the ability to absorb water was enhanced under salt stress,resulting in dilution of the cell's salt ion concentration to reduce physiological drought caused by salt ions.Na+ and Cl-contents of roots were higher than those of leaves under salt stress,so the salt ion damage on the leaves was reduced; The Si4+,K+,Ca2+ concentrations and K+/Na+,Ca2+/Na+,Si4+/Na+ ratio in roots under salt stress were significantly reduced compared with no salt stress.Based on the ion selective absorption of Na+ and K+,E.gmelini roots retained more Na+ and reduced the Na+ damage to leaves; The K+ selective absorption to leaves of E.gmelini were strengthened under NaCl stress,which was significant for maintaining iron homeostasis and photosynthesis in shoots.关键词
砂蓝刺头/盐胁迫/离子分布Key words
Echinops gmelini/ salt stress/ ion distribution分类
农业科技引用本文复制引用
杨小菊,赵昕,石勇,李新荣..盐胁迫对砂蓝刺头不同器官中离子分布的影响[J].草业学报,2013,22(4):116-122,7.基金项目
国家自然科学基金(30770343,91125029)资助. （30770343,91125029）
