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Neotyphodium fungal endophyte in tall fescue (Schedonorus phoenix): a comparison of three Northern European wild populations and the cultivar Kentucky-31

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Fungal Diversity 2013年第3期60卷 15-24页

作者： Pedro E.Gundel Marjo Helander Cecilia Casas Cyd E.Hamilton Stanley H.Faeth Kari Saikkonen MTT Agrifood Research Finland Plant Production Research31600 JokioinenFinland IFEVA-CONICET–Faculty of Agronomy Buenos Aires University(UBA)Buenos AiresArgentina Department of Biology Section of EcologyUniversity of Turku20014 TurkuFinland Soil Science Division Faculty of AgronomyBuenos Aires University(UBA)Buenos AiresArgentina Department of Biology University of North CarolinaGreensboroNC 27402-6170USA

Pooideae grasses may be colonized by systemic fungal *** fitness of endophyte depends entirely on resources and seed transmission from the host plant,while colonized plants may gain increased survival,growth,and reproduction relative to their uncolonized *** research of endophyte-grass interactions have been carried out on few cultivars of tall fescue(Schedonorus phoenix)and their symbiont Neotyphodium *** of studies using wild populations of tall fescue across the species natural distribution range,however,limits the understanding of the ecological and evolutionary role of the symbiosis in *** performed a common garden experiment in Southern Finland with three wild,tall fescue populations from northern Europe and the forage cultivar Kentucky-31(KY-31).For each population,we used naturally endophyte-colonized,naturally endophytecolonized but endophyte removed(decolonized),and naturally uncolonized plants to separate effects due to the host genotype from the *** evaluated growth variables and survival in four environmental treatments of varying water and *** of water and nutrients increased plant biomass and reproductive effort in all *** effect was higher for KY-31 plants which produced on average 55%more seeds than wild plants,indicating better adaptation to high resource ***,the higher incidence of Claviceps *** the low winter survival indicated KY-31 tall fescue is mal-adapted to Northern European *** colonized plants had greater plant biomass(≈12%),reproductive effort(≈22%)and seed mass(≈29%)than naturally uncolonized and decolonized ***,endophyte colonization did not affect plant survival,and the effects of endophyte colonization on tiller number,panicle/tiller ratio and Claviceps *** depended on the population *** the wild populations,endophyte removal only reduced the number of tillers(≈29%lower),while the differen

关键词： plant-microbial symbiosis Grass symbiosis Vertically transmitted symbiont Claviceps

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