The Na^+ and K^+ permeability of K^+ channel in plasma membrane, isolated from roots of the salt-tolerant mutant of ,wheat, was lower than that of wild type in 100 mmol/L KCI and NaCI solution. The opening frequency o...The Na^+ and K^+ permeability of K^+ channel in plasma membrane, isolated from roots of the salt-tolerant mutant of ,wheat, was lower than that of wild type in 100 mmol/L KCI and NaCI solution. The opening frequency of K^+ channel of the mutant reduced more significantly than that of wild type in two kinds of solution mentioned above. It is assumed that the reduction of opening frequency mainly contributes to the Na^+ and K^+ permeability of K^+ channel of the mutant. The electric conductance of single-channel of the mutant was similar to that of wild type and the main difference between them was exhibited as the opening frequency. Their K^+/Ka^+ selectivity of K^+ channel had no significant difference. The K^+/Na^+ selectivity of the mutant and wild type was 3.35 and 3. 18 respectively.展开更多
One of the detrimental effects of high salmity on plant cells is considered to be the result of an ion imbalance, particularly a high ratio of Na^+ to K^+ ions, in the cytoplasm. Such an imbalance is probably due to a...One of the detrimental effects of high salmity on plant cells is considered to be the result of an ion imbalance, particularly a high ratio of Na^+ to K^+ ions, in the cytoplasm. Such an imbalance is probably due to a great increase of entry of Na^+ ions into cells and a decline in absorption of K^+ ions under high-salinity conditions. Thus, plant cells展开更多
文摘The Na^+ and K^+ permeability of K^+ channel in plasma membrane, isolated from roots of the salt-tolerant mutant of ,wheat, was lower than that of wild type in 100 mmol/L KCI and NaCI solution. The opening frequency of K^+ channel of the mutant reduced more significantly than that of wild type in two kinds of solution mentioned above. It is assumed that the reduction of opening frequency mainly contributes to the Na^+ and K^+ permeability of K^+ channel of the mutant. The electric conductance of single-channel of the mutant was similar to that of wild type and the main difference between them was exhibited as the opening frequency. Their K^+/Ka^+ selectivity of K^+ channel had no significant difference. The K^+/Na^+ selectivity of the mutant and wild type was 3.35 and 3. 18 respectively.
基金Project supported by the National Natural Science Foundation of China.
文摘One of the detrimental effects of high salmity on plant cells is considered to be the result of an ion imbalance, particularly a high ratio of Na^+ to K^+ ions, in the cytoplasm. Such an imbalance is probably due to a great increase of entry of Na^+ ions into cells and a decline in absorption of K^+ ions under high-salinity conditions. Thus, plant cells
