title: Ectomycorrhizal colonization and growth of the hybrid larch F₁ under elevated CO₂ and O₃.
abstract: We studied the colonization of ectomycorrhizal fungi and species abundance of a hybrid larch (F1) under elevated CO₂ and O₃. Two-year-old seedlings were planted in an Open-Top-Chamber system with treatments: Control (O3 < 6 nmol/mol), O₃ (60 nmol/mol), CO₂ (600 μmol/mol), and CO2 + O₃. After two growing seasons, ectomycorrhiza (ECM) colonization and root biomass increased under elevated CO₂. Additionally, O₃ impaired ECM colonization and species richness, and reduced stem biomass. However, there was no clear inhibition of photosynthetic capacity by O₃. Concentrations of Al, Fe, Mo, and P in needles were reduced by O₃, while K and Mg in the roots increased. This might explain the distinct change in ECM colonization rate and diversity. No effects of combined fumigation were observed in any parameters except the P concentration in needles. The tolerance of F1 to O₃ might potentially be related to a shift in ECM community structure.
authors.affiliation: Graduate School of Agriculture, Hokkaido University, Japan.
authors.forename: Xiaona
authors.initials: X
authors.lastname: Wang
authors.affiliation: Research Center for Eco-Environment Sciences, Chinese Academy Sciences, China.
authors.forename: Laiye
authors.initials: L
authors.lastname: Qu
authors.affiliation: Research Faculty of Agriculture, Hokkaido University, Japan.
authors.forename: Qiaozhi
authors.initials: Q
authors.lastname: Mao
authors.affiliation: Research Faculty of Agriculture, Hokkaido University, Japan; Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8506, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Watanabe
authors.affiliation: Research Faculty of Agriculture, Hokkaido University, Japan.
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Hoshika
authors.affiliation: Deparetment of Biology, Colorado State University, Fort Collins, CO 80523-1878, USA.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Koyama
authors.affiliation: Graduate School of Agriculture, Hokkaido University, Japan.
authors.forename: Korin
authors.initials: K
authors.lastname: Kawaguchi
authors.affiliation: Research Faculty of Agriculture, Hokkaido University, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Tamai
authors.affiliation: Research Faculty of Agriculture, Hokkaido University, Japan. Electronic address: tkoike@for.agr.hokudai.ac.jp.
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Koike
mesh_terms: D000393:Air Pollutants / Q000633:toxicity*; D018533:Biomass; D002245:Carbon Dioxide / Q000633:toxicity*; D005651:Fumigation; D005658:Fungi; D028221:Larix / Q000187:drug effects / Q000254:growth & development*; D038821:Mycorrhizae / Q000502:physiology; D010126:Ozone / Q000633:toxicity*; D010788:Photosynthesis / Q000502:physiology; D018517:Plant Roots; D018547:Plant Stems; D010944:Plants; D036226:Seedlings / Q000254:growth & development
chemical_list: D000393:Air Pollutants; D002245:Carbon Dioxide; D010126:Ozone
keywords: Ectomycorrhiza; Elevated CO(2); Elevated ozone; Hybrid larch F(1); Species richness