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Symbiotic interactions as drivers of trade-offs in plants: effects of fungal endophytes on tall fescue

Fungal Diversity 2013年第3期60卷 5-14页

作者： Pedro E.Gundel Lucas A.Garibaldi Marjo Helander Kari Saikkonen Department of plant Production MTT Agrifood Research Finland31600 JokioinenFinland IFEVA-CONICET-Faculty of Agronomy Buenos Aires University(UBA)Buenos AiresArgentina Sede Andina Universidad Nacional de Río Negro(UNRN)and Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET)Mitre 6308400 San Carlos de BarilocheRío NegroArgentina Section of Ecology Department of BiologyUniversity of TurkuTurkuFinland

Studying the controls on biomass allocation trade-offs in plants are important since they affect harvestable product yields and are critical to understanding symbiotic *** fungal endophytes associate with cool-season grasses,growing systemically within the plant inter-cellular spaces and are transmitted through *** explore the endophytes influence on the relationship between the plant reproductive and vegetative aboveground biomass(reproductive effort:RE)and on the trade-off between two components of the reproductive biomass,number and weight of panicles(RPN),using tall fescue as a model *** endophyte-colonized,manipulatively endophyte-free,and naturally endophyte-free plants from Northern European wild-populations together with the cultivar Kentucky-31 were grown under different environmental conditions(nutrients x water).The endophyte had an effect on the RPN(E+:6.19,ME-:4.68 and E-:4.40)which indicates how reproductive biomass is partitioned into number and mass of panicles,but not on RE(≈0.06).As expected,wild plants showed higher reproductive effort(≈0.06)compared to the cultivar KY-31(0.05),irrespective of endophyte ***-colonized plants had lighter panicles than endophyte-free plants,a pattern that was clear among low-yielding ***,the tradeoff between RPN and RE was higher for endophytecolonized *** was again evident among plants with low RE indicating that colonized plants split the yield into either greater number of panicles and/or lighter *** effect of vertically transmitted endophytes has earlier been studied as ratios(***);however,our study shows that this approach may hide size-dependent endophyte effects on these *** study reveals that Neotyphodium endophyte affects trade-offs in tall fescue plants in a complex manner,and is influenced by a number of biological and abiotic factors.

关键词： Allometry Biomass partitioning Neotyphodium Festuca Symbiosis plant-endophyte interaction

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