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培养液中含有 1mmol·L-1K+、Na+离子的玉米根运往木质部渗出液中的K+/Na+比最大 ;低温不影响渗出液中的K+/Na+比 ,但极大地减少了根部向地上部输送的K+、Na+总量 ;钙的加入可以大大提高渗出液中的K+/Na+比 ,减少由根部向地上部输送的Na+量。
The K + / Na + ratio of maize roots containing 1 mmol·L-1 K + and Na + ions to exudates of xylem was the highest in culture medium, while K + / Na + ratio in exudate was not affected by hypothermia, but the root- The amount of K + and Na + delivered can increase the ratio of K + / Na + in exudate greatly and decrease the amount of Na + transported from the roots to the shoots.