naa a22 4500 510759467 CHVBK 20180411083134.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s13225-013-0224-y doi (NATIONALLICENCE)springer-10.1007/s13225-013-0224-y Symbiotic interactions as drivers of trade-offs in plants: effects of fungal endophytes on tall fescue [Elektronische Daten] [Pedro Gundel, Lucas Garibaldi, Marjo Helander, Kari Saikkonen] Studying the controls on biomass allocation trade-offs in plants are important since they affect harvestable product yields and are critical to understanding symbiotic interactions. Epichloae fungal endophytes associate with cool-season grasses, growing systemically within the plant inter-cellular spaces and are transmitted through seeds. We 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 system. Naturally 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 presence. Endophyte-colonized plants had lighter panicles than endophyte-free plants, a pattern that was clear among low-yielding plants. Similarly, the trade-off between RPN and RE was higher for endophyte-colonized plants. This was again evident among plants with low RE indicating that colonized plants split the yield into either greater number of panicles and/or lighter panicles. The effect of vertically transmitted endophytes has earlier been studied as ratios (e.g. RE); however, our study shows that this approach may hide size-dependent endophyte effects on these relationships. Our 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. Mushroom Research Foundation, 2013 Allometry nationallicence Biomass partitioning nationallicence Neotyphodium nationallicence Festuca nationallicence Symbiosis nationallicence Plant-endophyte interaction nationallicence Gundel Pedro Department of Plant Production, MTT Agrifood Research Finland, 31600, Jokioinen, Finland aut Garibaldi Lucas Sede Andina, Universidad Nacional de Río Negro (UNRN) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mitre 630, 8400, San Carlos de Bariloche, Río Negro, Argentina aut Helander Marjo Section of Ecology, Department of Biology, University of Turku, Turku, Finland aut Saikkonen Kari Department of Plant Production, MTT Agrifood Research Finland, 31600, Jokioinen, Finland aut Fungal Diversity Springer Netherlands 60/1(2013-05-01), 5-14 1560-2745 60:1<5 2013 60 13225 https://doi.org/10.1007/s13225-013-0224-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s13225-013-0224-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gundel Pedro Department of Plant Production, MTT Agrifood Research Finland, 31600, Jokioinen, Finland aut NATIONALLICENCE 700 1- Garibaldi Lucas Sede Andina, Universidad Nacional de Río Negro (UNRN) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mitre 630, 8400, San Carlos de Bariloche, Río Negro, Argentina aut NATIONALLICENCE 700 1- Helander Marjo Section of Ecology, Department of Biology, University of Turku, Turku, Finland aut NATIONALLICENCE 700 1- Saikkonen Kari Department of Plant Production, MTT Agrifood Research Finland, 31600, Jokioinen, Finland aut NATIONALLICENCE 773 0- Fungal Diversity Springer Netherlands 60/1(2013-05-01), 5-14 1560-2745 60:1<5 2013 60 13225 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer