K+ Accumulation in Poplar Roots Induced by Osmotic Stress

Cuttings of Populus × xiaozhuanica W.Y.Hsu et Liang cv.‘ Popularis ’ 35 44 were treated with PEG solution. After fast freezing,freeze-drying,pressure infiltration with ether and embedding in plastic,K+ content were measured by X ray microanalysis in cell wall,cytoplasm and vacuole of rhizodermis, cortex and stelar parenchyma cells of roots. Compared to the controls,K+ content in all root tissues were increased by osmotic stress.In particular,the increasing K+ was largely accumulated in vacuole. The K+ accumulation induced by osmotic stress could be inhibited completely by cycloheximide.