田野菟丝子寄生对五种红树植物叶绿素荧光参数的影响

Influence of parasitic plant Cuscuta campestris on leaf chlorophyll fluorescence parameters of five mangrove species

红树林由于受到入侵植物薇甘菊的危害发生大面积退化,而田野菟丝子寄生是防控薇甘菊的有效途径。为了探讨田野莬丝子寄生对红树植物的影响,该研究通过同质园控制试验,利用PAM-2100便携式调制叶绿素荧光仪,测定了三种真红树植物(老鼠簕、木榄、秋茄)和两种半红树植物(海芒果、银叶树)幼苗在田野菟丝子寄生及对照情况下的叶片叶绿素荧光参数。结果表明:田野菟丝子寄生对红树植物幼苗光系统Ⅱ(PSⅡ)最大光化学效率(F_v/F_m)没有显著影响;对更为敏感的红树植物幼苗PSⅡ潜在活性(F_v/F_o)同样也没有显著影响;试验后期发现田野菟丝子对红树植物幼苗无法成功寄生。由此可见,田野菟丝子用于红树林薇甘菊的防治是安全的。

Because of the invasion of Mikania micrantha,mangrove forests are suffering a large area of degradation.Parasitism of Cuscuta campestris is an effective way to control the destruction of Mikania micrantha.In order to explore the effects of parasitism of Cuscuta campestris on mangrove plants and to provide the basis for the selection of the parasitism of C.campestris to control the invasion of Mikania micrantha in the mangrove community.In this study,through common-garden experiments,leaf chlorophyll fluorescence parameters were determined by PAM-2100 portable modulated chlorophyll fluorescence analyzer for the leaves of three true mangrove plant species(Acanthus ilicifolius,Bruguiera gymnorrhiza and Kandelia candel)and two mangrove associates(Cerbera manghas and Heritiera littoralis),uninfected or infected by Cuscuta campestris.The results showed that the infection with Cuscuta campestris had no significant effects on F v/F m or more sensitive F v/F o in the PSⅡof seedling of the mangrove species.By the end of the experiment,we found that although C.campestris could initiate haustoria on stems of mangrove plants,it failed to finish successful parasitism and then died.Therefore,the application of C.campestris to control Mikania micrantha invasion into mangrove forests is safe.