| The effects of different calcium, potassium nutrition concentration on growth development and physiological characteristic of potato variety "gram new No1" were investigated under NaCl stress under tissue culture conditions.the main conclusions were as follows:1Under different NaCl concentration stress,5～15mmol/L CaCl2treatment could increase plant height,stem diameter, leaf number and the dry weight of stem and leaf of potato and could improved the root activity of potato under25mmol/L and50mmol/L NaCl stress.2Under the low-salt stress,5～15mmol/L CaCl2treatment promoted the increasing of proline content, soluble sugar content, soluble protein content. Under the same salt concentration stress, superoxide dismutase (SOD) activity and peroxidase (POD) activity was increased firstly and then decreased with the increasing of CaCl2concentration.And when CaCl2concentration was10mmol/L, superoxide dismutase (SOD) activity and peroxidase (POD) activity were the largest. Ca2+also promoted the decreasing of cell membrane permeability and MDA content effectively. But under the high-salt stress, the effect of5～10mmol/L CaCl? treatment was best.3Under the low-salt stress,4～12mmol/L K2SO4treatment increased plant height, the dry weight of stem and leaf and root activity,and8mmol/L K2SO4was the best than the orthers. But under the high-salt stress, the effect of4mmol/L K2SO4treatment was the best.4Under different NaCl concentration stress,4～12mmol/LK2SO4treatment promoted the increasing of Proline content, chlorophyll content, K+content, superoxide dismutase (SOD) activity and peroxidase (POD) activity. K2SO4also promoted the decreasing of cell membrane permeability and MDA content effectively. And under the low-salt stress, the effect of4mmol/L K2SO4treatment was the best. Under the high-salt stress, the effect of4mmol/L K2SO4treatment was the best. |
