三叶鬼针草和黑心菊根系分泌物对井栏边草配子体叶绿素荧光特性的影响  

Effects of the Root Exudates of Bidens pilosa and Rudbeckia hirta on Chlorophyll Fluorescence of the Gametophyte of Pteris multifida

作　　者：张开梅[1] 沈羽[1] 刘颖[1] 刘俊华[1] 方炎明[1] 

机构地区：[1]南京林业大学森林资源与环境学院,南京210037

出　　处：《湖北农业科学》2014年第20期4861-4864,4911,共5页Hubei Agricultural Sciences

基　　金：国家自然科学基金项目(31200233);江苏省高校协同创新计划项目;江苏高校优势学科建设工程资助项目;南京林业大学高层次人才科研启动基金项目(G2014001)

摘　　要：研究了入侵植物三叶鬼针草（Bidens pilosa）和非入侵植物黑心菊（Rudbeckia hirta）的根系分泌物对三叶鬼针草入侵和潜在扩散区代表蕨类植物井栏边草（Pteris multifida）配子体叶绿素荧光参数的影响.结果表明,与对照相比,除非光化学荧光淬灭系数外,三叶鬼针草和黑心菊均可降低井栏边草其他叶绿素荧光参数.这种抑制作用随2种植物根系分泌物浓度升高而增强.处理第十天,抑制效果最明显.当三叶鬼针草和黑心菊根系分泌物浓度高于12.5％时,在处理4-10d后,配子体各叶绿素荧光参数均受到显著影响.综上所述,三叶鬼针草和黑心菊对井栏边草配子体光合能力均可产生抑制作用,且三叶鬼针草抑制作用更强.Pteris multifida is a common fern in China,with overlapping distribution area with a main invasive plant Bidens pilosa in China.Root exudates of B.pilosa,as well as non invasive plant Rudbeckia hirta,were applied to investigate their effects on fluorescence in P.multifida gametophytes.We found that gametophytes exposed to both B.pilosa and R.hirta had decreased fluorescence parameters in comparison with the control,except for non photochemical quenching （NPQ）.The inhibitory effects increased with increasing exudate concentrations of both species.The greatest inhibition exhibited at Day 10.Furthermore,it was found that these parameters were markedly affected from Day 4 to Day 10 in the presence of both exudates at a concentration of 12.5％ or above.It is concluded that both B.pilosa and R.hirta negatively affected the photosynthetic activity of P.multifida.Comparative research of invasive and non-invasive plants in our experiments demonstrated that invasive plants Bidens pilosa were responsible for the critical damage to local species.

关 键 词：三叶鬼针草(Bidens pilosa) 黑心菊(Rudbeckia hirta) 井栏边草(Pteris multifida) 配子体 叶绿素荧光 

分 类 号：Q945.7[生物学—植物学]