该文探讨了干燥脱水后的复苏植物密罗木(Myrothamnus flabellifolia)的复水速度和复水后不同时间下的木质部压力与植物对光-暗反应的关系。研究结果表明, 密罗木整株植物和离体枝条复水时水分在茎内的上升速度都很快, 10小时左右水分即可接近枝条的顶端。在植物复水初期, 木质部压力反应随着复水时间的延长不断增加, 3周后达到正常值。这种木质部压力的调节能力可能与气孔功能的恢复程度有关。同时, 密罗木在整个复水恢复过程中受到光照时木质部压力下降的弛豫时间都明显大于植物在光源关闭时木质部压力上升的弛豫时间。表明密罗木对蒸腾速率上升过程的调节速度明显低于对蒸腾速率下降过程的调节速度。
We investigated the rate of water ascent and time course of xylem pressure in response to light or darkness in the rehydrated resurrection plant Myrothamnus flabellifolia. The time for water to rise to the apex of an intact or detached desiccated twig was about 10 h, whereas the time for full recovery of the regulation of xylem pressure response to light or darkness was about 3 weeks. The recovery of the pressure regulation should be associated with the recovery and function of stomata in desiccated leaves after rehydration. In addition, the relaxation time of xylem pressure decline in response to light was significantly longer than that of xylem pressure ascent in response to darkness, so the regulation rate of the plant to transpiration increase induced by light was significantly lower than that to transpiration decline induced by darkness.
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