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采用电子称重法检测了柳(Salix babylonica L.)苗蒸腾对盐激(NaCl)的快速反应。结果表明,100～500mmol/L的NaCl处理柳苗根系时,均能引起根系中产生一个负水压信号,并以极快的速度传递至冠部叶片,引起植物体液向下流动,在1～2s内使柳苗蒸腾速率增加至原来的8～15倍,然后逐渐下降,8～12min后,蒸腾速率保持在原来的水平(或略低)。另外,在蒸腾速率变化约2min后,在叶片区柳茎表面记录到电波的快速传递(速度变化范围在28～120mm·s~(-1)),这可能是主动调节冠部水分消耗的一个信号。
The rapid response of Salix babylonica L. transpiration to salt stress (NaCl) was detected by electronic weighing method. The results showed that 100 ~ 500mmol / L NaCl could induce a negative water pressure signal in the root system of the willow seedlings and transfer it to the crown leaf at a very fast speed, causing the body fluid to flow downward. Within 2s, the transpiration rate of willow seedlings increased to 8 ~ 15 times of the original, and then decreased gradually. After 8 ~ 12min, the transpiration rate kept at the original level (or slightly lower). In addition, after the transpiration rate was changed for about 2min, the rapid transmission of radio waves was recorded on the stems and leaves of the leaf area (speed ranged from 28 to 120 mm · s -1), which may be one of the active regulation of crown water consumption signal.