花叶鹅掌柴对日本菟丝子寄生的生理响应

Physiological Response of Schefflera odorata cv.Variegata to Cuscuta japonica Parasitization

为了阐明菟丝子与其寄主植物的相互关系,寻找菟丝子防治的有效方法,本试验采用人工接种法研究花叶鹅掌柴被日本菟丝子寄生后的生理反应。结果显示:花叶鹅掌柴被日本菟丝子寄生后其叶绿素含量下降45.5%,超氧化物歧化酶(SOD)和苯丙氨酸解氨酶(PAL)活性分别升高31.9%和143.6%,丙二醛(MDA)含量和过氧化物酶(POD)活性分别降低12.2%和4.4%;净光合速率(Pn)、气孔导度(Cond)和蒸腾速率(Tr)均明显下降。表明花叶鹅掌柴对菟丝子寄生的生理响应明显,被寄生后能产生一系列生理生化反应来适应寄生胁迫。

In order to clarify the relationship between dodder and its host plant,and find the effective method for the control of dodder,the physiological responses of Schefflera odorata cv.Variegata to Cuscuta japonica parasitization were studied by using artificial inoculation method.The results showed that the chlorophyl content of Schefflera odorata cv.Variegata was decreased by 45.5% after parasitized by Cuscuta japonica,SOD and PAL enzymes activity were increased 31.9% and 143.6% respectively.While the content of MDA and POD enzyme activity were declined 12.2% and 4.4% respectively.The net photosynthetic rate （P n）,stomatal conductance （Cond） and transpiration rate （T r） were obviously decreased.It showed that the physiological response of Schefflera odorata cv.Variegata to Cuscuta japonica parasitization was obviously,and could produce a series of physiological and biochemical reactions to adapt the parasitic stress.