多效唑对柽柳和管花肉苁蓉物质分配的调控作用

Effects of paclobutrazol on growth characteristics and dry matter distribution of Tamarix chinensis and Cistanche tubulosa

以中国柽柳和管花肉苁蓉为材料，研究了多效唑对柽柳生长和柽柳一管花肉苁蓉物质分配的调控作用。多效唑喷施试验结果：1）降低了柽柳株高，降低范围为7．9％～12．2％。2）提高了柽柳叶片的总叶绿素含量和净光合速率，升高幅度分别为19．4％～70．4％和19．0％～69．4％。3）增加了柽柳干物质向管花肉苁蓉的分配比例，管花肉苁蓉单株生物量增加8．2％～35．9％。4）当多效唑浓度为1．0～2．0g／L时，管花肉苁蓉中非结构性碳水化合物的含量和累积量均高于对照。5）多效唑适宜喷施浓度为：1.5～2．0g／L。结果表明，多效唑具有通过抑制柽柳徒长、提高柽柳光合速率和增加柽柳同化物向管花肉苁蓉的分配而提高管花肉苁蓉生物量的作用。

To study the effects of paclobutrazol on growth, dry matter accumulation and distribution among Tamarix chinensis and Cistanche tubulosa, changes of chlorophyll content, net photosynthetic rate, biomass and non-structural carbohydrate content were studied under different paclobutrazol levels. The results showed that： 1 ） Plant height of T. chinensis decreased along with application of paclobutrazol. 2） Under spraying paclobutrazol condition the chlorophyll content and the net photosynthetic rate of T. chinensis improved 19.4% - 70.4% and 19.0% - 69.4% respectively.3） The distribution proportion of the dry matter of C. tubufosa was also increased after treatment with paclobutrazol. 4） The content and accumulation of non-structural carbohydrates of C. tubulosa were higher than those of controls when 1.0 to 2.0 g/L of paclobutrazol was applied. 5） The optimal concentration for paclobutrazol treatment was 1.5 to 2.0 g/L. It is evident that the spraying paclobutrazol could increase the dry matter of C. tubulosa by inhibiting plant height and improving net photosynthetic rate of T. chinensis.