No plant functional diversity effects on foliar fungal pathogens in experimental tree communities  

作　　者：Lydia Hantsch Uwe Braun Josephine Haase Oliver Purschke Michael Scherer-Lorenzen Helge Bruelheide 

机构地区：[1]Institute of Biology,Geobotany and Botanical Garden,Martin Luther University Halle Wittenberg,Am Kirchtor 1,06108 Halle(Saale),Germany [2]Department of Environmental Systems Science,ETH Zurich,Ecosystem Management,Institute of Terrestrial Ecosystems,Universitaetsstr.16,8092 Zurich,Switzerland [3]German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig,Deutscher Platz 5e,04103 Leipzig,Germany [4]Faculty of Biology,Geobotany,Alberts-Ludwigs University of Freiburg,Schaenzlestr.1,79104 Freiburg,Germany

出　　处：《Fungal Diversity》2014年第3期139-151,共13页真菌多样性（英文）

基　　金：The research leading to these results also attracted funding from the European Union’s Seventh Framework Programme(FP7/2007-2013)under grant agreement no;265171,project FunDivEUROPE as well as of the BACCARA project,which received funding from the European Commission’s Seventh Framework Programme(FP7/2007-2013),under grant agreement no;226299.O.P.and H.B.also acknowledge the support of the German Centre for Integrative Biodiversity Research(iDiv)HalleJena-Leipzig,funded by the German Science Foundation(FZT 118).

摘　　要：Foliar fungal pathogens affect forest ecosystem processes by exerting highly species-specific impacts on growth and survival of trees.As many ecosystem processes in forests depend on functional diversity of specific tree species,a close relationship is expected between this and foliar fungal pathogen infestation.Testing for such a relationship in the German tree diversity experiment BIOTREE(Bechstedt),we hypothesized that pathogen richness and pathogen load decline with increasing functional diversity of tree communities.Using macro-and microscopic analyses,we assessed pathogen richness and load on 16 tree species in plots that,although differing in functional diversity,had the same tree species richness.We found no effects of functional diversity on pathogen richness or load.However,we encountered strong species identity effects in plot species composition,as susceptible tree species contributed positively to each community’s pathogen richness and load.Furthermore,testing for effects of particular leaf traits and geographical range size of host species revealed a significant effect of total leaf phenolics,which was unexpected as pathogen richness increased with increasing content in polyphenolics.Our study showed that at the community level,host species’identity was more important for foliar fungal pathogen richness and load than the functional diversity of host trees.The positive relationship between pathogen richness and phenolics in leaves,along with the finding that pathogen richness is very much conserved in tree species,point to an evolutionary arms race between hosts and fungi resulting from fungi increasing their capacity to infect tree leaves and trees boosting their defences.

关 键 词：Biodiversity-ecosystem functioning BIOTREE experiment Host defence traits Phylogenetic pattern POLYPHENOLICS Tree species identity effects 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]