Isolation of protoplast from callus of Populus euphratica and H fluxes across plasma membrane under NaCl stress

We used callus of Populus euphratica Olive to isolate protoplasts, and H fluxes across plasma membrane were investi-gated. The concentration of enzymes for protoplast isolation, e.g. cellulase, pectolyase, macerozyme, hemicellulase, and sorbitol content, incubation time were systemically studied. High yield and viability of protoplast was achieved after 6-8 hours incubation of P. euphratica callus in enzyme solution containing 1.5% (w:v) cellulase R-10, 0.1% (w:v) pectolyase Y-23, 0.2% (w:v) macerozyme R-10, 0.05% (w:v) hemicellulase and 0.75-0.80 mol·L-1 sorbitol. Non-invasively ion selective microelectrode technique was used to access proton fluxes in the absence and presence of NaCl (20 mmol·L-1). Salt-induced transient net H efflux was observed in the plasma membrane of P. euphratica cells. The shift of H flux response to NaCl shock and the relevance to salt tolerance were discussed.     

月季原生质体分离条件的研究

采用质壁分离和冰冻预处理月季幼叶.用纤维素酶、果胶酶、甘露醇的混合酶液分离原生质体,并对影响原生质体产量及活力因素进行分析.结果表明,纤维素酶对原生质体产量有极显著影响,适宜月季幼叶原生质体提取的酶液组合为:纤维素酶1.5%、果胶酶0.5%、甘露醇0.6 mol/L、酶解12 h;质壁分离后,原生质体产量增加,但活力降低;冰冻处理使产量提高,处理12 h时,原生质体活力达到最高.