title: Effects of tropospheric ozone on loblolly pine seedlings inoculated with root infecting ophiostomatoid fungi.
abstract: Seedlings from four loblolly pine (Pinus taeda L.) families were exposed in open-top chambers to charcoal-filtered air (CF), non-filtered air (NF) or air amended with ozone to 2 times ambient (2×). Two of the families used were selected for their tolerance to fungi associated with Southern Pine Decline while two were selected for their susceptibility. Seedlings were treated with five inoculation treatments: no wound (NW), wound only (W), wound + media (WM), Grosmannia huntii (GH) and Leptographium terebrantis (LT). After 118 days of exposure (AOT40 = 31 ppm-hr(-1) for 2× ozone) seedling volume, dry matter, chlorophyll content, water potential and lesions were measured and analyzed using ANOVA procedures. Our results indicate that seedlings selected for their susceptibility to root infecting ophiostomatoid fungi were also more sensitive to ozone. Overall lesion length was greater on seedlings exposed to elevated ozone concentrations but was not specific to either root infecting ophiostomatoid fungi.
authors.affiliation: Forest Health Dynamics Laboratory, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, USA. Electronic address: jjc0022@auburn.edu.
authors.forename: Jeff
authors.initials: J
authors.lastname: Chieppa
authors.affiliation: School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, USA.
authors.forename: Art
authors.initials: A
authors.lastname: Chappelka
authors.affiliation: Forest Health Dynamics Laboratory, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, USA.
authors.forename: Lori
authors.initials: L
authors.lastname: Eckhardt
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D055155:Ophiostomatales / Q000502:physiology*; D010126:Ozone / Q000633:toxicity*; D041603:Pinus taeda / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism / Q000382:microbiology*; D010935:Plant Diseases / Q000382:microbiology; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism / Q000382:microbiology; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism / Q000382:microbiology
chemical_list: D002734:Chlorophyll; D010126:Ozone
keywords: Grosmannia huntii; Leptographium terebrantis; Loblolly pine; Root infecting ophiostomatoid fungi; Tropospheric ozone