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Root Morphology and Mycorrhizal Symbioses Together Shape Nutrient Foraging Strategies of Temperate Trees

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Root Morphology and Mycorrhizal Symbioses Together Shape Nutrient Foraging Strategies of Temperate Trees Root morphology and mycorrhizal symbioses together shape nutrient foraging strategies of temperate trees Weile Chen (陈伟乐)a,b, Roger T. Koidea,c, Thomas S. Adamsa,b, Jared L. DeForestd, Lei Chenga,e, and David M. Eissenstata,b,1 aIntercollege Graduate Degree Program in Ecology, The Pennsylvania State University, University Park, PA 16802; bDepartment of Ecosystem Science and Management, The Pennsylvania State University, University Park, PA 16802; cDepartment of Biology, Brigham Young University, Provo, UT 84602; dDepartment of Environmental and Plant Biology, Ohio University, Athens, OH 45701; and eCollege of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China Edited by Sarah E. Hobbie, University of Minnesota, St. Paul, MN, and approved May 26, 2016 (received for review January 20, 2016) Photosynthesis by leaves and acquisition of water and minerals by (AM) symbioses (17). Ectomycorrhizal (EM) symbioses emerged roots are required for plant growth, which is a key component of among several of the more advanced lineages of plants (18). In many ecosystem functions. Although the role of leaf functional many temperate forests, both AM and EM trees commonly co- traits in photosynthesis is generally well understood, the relation- occur despite fundamental differences in nutrient acquisition ship of root functional traits to nutrient uptake is not. In particular, strategies (19, 20). EM fungi are, on the whole, better adapted to predictions of nutrient acquisition strategies from specific root acquire nutrients from organic substrates than AM fungi (21, 22). traits are often vague. Roots of nearly all plants cooperate with Thus, EM trees may exhibit greater dependence on mycorrhizal mycorrhizal fungi in nutrient acquisition. Most tree species form hyphal foraging than AM trees under conditions where nutrients symbioses with either arbuscular mycorrhizal (AM) or ectomycor- largely occur in organic forms. rhizal (EM) fungi. Nutrients are distributed heterogeneously in the Moreover, absorptive roots of many species in the more re- soil, and nutrient-rich “hotspots” can be a key source for plants. cently diverged lineages tend to be thinner than those roots of Thus, predicting the foraging strategies that enable mycorrhizal species of more basal lineages (23). Recent studies suggest that root systems to exploit these hotspots can be critical to the un- the diameter of absorptive roots, which affects the carbon costs of derstanding of plant nutrition and ecosystem carbon and nutrient constructing root length (24), also influences root foraging strat- cycling. Here, we show that in 13 sympatric temperate tree spe- egies for mineral nutrients (11, 12). Compared with species with cies, when nutrient availability is patchy, thinner root species alter thin roots, thick-root species often have longer root lifespans (25) their foraging to exploit patches, whereas thicker root species but, at least in AM species, proliferate their roots more slowly in do not. Moreover, there appear to be two distinct pathways by nutrient-rich patches (11, 12). Thus, there may be a trade-off which thinner root tree species enhance foraging in nutrient-rich between building long-lived, thick absorptive roots and rapid root patches: AM trees produce more roots, whereas EM trees produce foraging in ephemeral nutrient hotspots in AM species. However, more mycorrhizal fungal hyphae. Our results indicate that strate- because roots are mycorrhizal in the vast majority of cases, one gies of nutrient foraging are complementary among tree species needs to consider the mycorrhizal fungi, together with roots, when with contrasting mycorrhiza types and root morphologies, and that attempting to understand nutrient foraging (12, 15, 26). For exam- predictable relationships between below-ground traits and nutrient ple, when foraging in fertile patches that are relatively short-lived, acquisition emerge only when both roots and mycorrhizal fungi are there may be a greater advantage for plant species with costly, thick considered together. absorptive roots to rely more on mycorrhizal fungi than those plant species with less costly, thin roots because hyphae are typically much mycorrhizal fungi | plant traits | root proliferation | soil heterogeneity | thinner and, presumably, much less costly than roots. symbioses Significance n recent years, there has been considerable progress in linking Iplant traits such as leaf thickness and wood density to various Plant growth requires acquisition of soil nutrients in a patchy plant functions (1, 2), which can be of considerable value in environment. Nutrient patches may be actively foraged by scaling ecosystem processes to landscape and global scales (3). symbioses comprising roots and mycorrhizal fungi. Here, we Plants also use a suite of approaches for acquiring nutrients from show that thicker root tree species (e.g., tulip poplar, pine) re- the soil, but an explicit link is lacking between nutrient acquisi- spond weakly or not at all to nutrient heterogeneity. In contrast, tion and specific root traits. For example, nutrients are often thinner root tree species readily respond by selectively growing heterogeneously distributed in soil due to the patchy distribution roots [arbuscular mycorrhizal trees (e.g., maple)] or mycorrhizal of litter and the activities of animals so that a precise foraging fungal hyphae [ectomycorrhizal trees (e.g., oak)] in nutrient-rich strategy that allows preferential root proliferation in nutrient- “hotspots.” Our results thus indicate predictable patterns of rich “hotspots” can provide greater nutrient returns for a par- nutrient foraging among tree species with contrasting mycor- ticular carbon investment in roots (4–7). However, the precision rhiza types and root morphologies. These findings can pave the of plant foraging for nutrients that are distributed in patches way for a more holistic understanding of root-microbial func- varies widely among species (8–12), and the cause of the varia- tion, which is critical to plant growth and biogeochemical cycles tion and how it is linked to root traits remain unclear. Increasing in forested ecosystems. evidence suggests that simple relationships between root con- Author contributions: W.C., R.T.K., L.C., and D.M.E. designed research; W.C. performed struction and root function may need to include the symbiotic research; T.S.A. and J.L.D. contributed new reagents/analytic tools; W.C. analyzed data; relationship between roots and mycorrhizal fungi (13, 14), which and W.C., R.T.K., T.S.A., J.L.D., L.C., and D.M.E. wrote the paper. function together in nutrient acquisition (15). The authors declare no conflict of interest. Among the tree species of the world’s forests, there is significant This article is a PNAS Direct Submission. 1 variation in the types of associated mycorrhizal fungi and in the To whom correspondence should be addressed. Email: [email protected]. ECOLOGY construction of the absorptive roots (16). Species in the basal plant This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. lineages, such as the Magnoliaceae, form arbuscular mycorrhizal 1073/pnas.1601006113/-/DCSupplemental. www.pnas.org/cgi/doi/10.1073/pnas.1601006113 PNAS | August 2, 2016 | vol. 113 | no. 31 | 8741–8746 Downloaded by guest on September 26, 2021 species (−4 to 29%; Fig. 1). Using an alternate method of AM and EM fungal estimations generated overall similar results in the pattern of species foraging precision (Fig. S4). These results suggest, for the first time to our knowledge, the existence of two spectra in foraging strategies among temperate trees determined by their mycorrhiza types. Unlike the universal leaf economics spectrum of photosynthesis (1), we found two potential pathways (roots vs. hyphae) in nutrient acquisition. AM trees vary in their ability to forage selectively in nutrient patches primarily by varying root proliferation as a function of root diameter. In contrast, EM trees vary in their ability to forage selectively in nutrient patches primarily by varying mycorrhizal hyphal proliferation as a function of root diameter. There was comparatively little change in root biomass, root architecture, and percentage of mycorrhizal colo- nization of roots when trees species foraged in the nutrient-rich patches (Table S2). Compared with root foraging, the use of mycorrhizal fungal hyphae may permit a more thorough exploitation of nutrient patches in soil (15). This prediction was supported for the EM trees, which showed greater hyphal foraging precision than root foraging precision in the majority of trees (average of 74% for Fig. 1. Foraging precision of roots vs. extramatrical mycorrhizal fungal hyphae vs. 21% for roots, five of seven tree species were above hyphae. Six AM (red color) and seven EM (green color) tree species are the 1:1 line; Fig. 1). EM trees may rely more on their fungal shown. The thickness of the symbol “x” is proportional to averaged root diameter of the first three root orders of the species. Species located above symbionts because some EM fungi are known to develop rhizo- the 1:1 line suggest higher foraging precision in mycorrhizal hyphae than morphs that can extend many centimeters away from a root (29) roots, whereas species located below the 1:1 line suggest higher foraging and also have greater potential for mineralizing organic matter than precision in roots than mycorrhizal hyphae. Precision of mycorrhizal hyphal roots or AM fungi (21). However, the situation was quite different foraging
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