土壤含水量对红豆杉紫杉醇含量及相关生理指标的影响

以曼地亚红豆杉扦插苗为材料，在温室条件下研究了不同土壤含水量对其枝叶紫杉醇含量及相关生理指标的影响。结果显示：（1）枝叶中紫杉醇产量均随土壤含水量的降低而降低，在土壤含水量（258 %）大于对照（184 %）时，单株枝叶干质量比对照提高3366 %，相应紫杉醇产量提高5356 %。在土壤含水量为129 %、86 %和43 %的处理下，枝叶产量分别比对照减少885 %、1849 %和2958 %，而紫杉醇产量相应减少2415 %、5108 %和8297 %。（2）随着土壤含水量的降低，枝叶叶绿素含量随土壤含水量的降低而降低，脯氨酸和溶性糖含量先增加后降低，而丙二醛含量先降低后增加。

Effects of soil moisture on taxol content and related physiological indexes of Taxus media cv.Hicksii

Taking Taxus media cv.Hicksii cutting seedling as material,we researched the effects of different soil moisture on taxol content and the related physiological indexes of branches and leaves of T.media cv.Hicksii in the greenhouse.The results showed :(1) Taxol content in branches and leaves decreased with soil moisture decreasing.In the treatment with soil moisture of 25.8 %,dry weight of branches and leaves per plant increased by 33.66 %,and taxol yield accordingly increased by 53.56 %,comparing with the control with soil moisture of 18.4 %.Moreover,in the treatment with soil moisture of 12.9 %,8.6% and 4.3%,branches and leaves yield decreased by 8.85 %,18.49 % and 29.58%,while taxol yield decreased by 24.15 %,51.08 % and 82.97 %,respectively.(2) With soil moisture decreasing,chlorophyll content in branches and leaves decreased,contents of proline and soluble sugar firstly increased and then decreased,while MDA content firstly decreased and then increased.