DOI: 10.1016/j.foreco.2013.10.009
Scopus记录号: 2-s2.0-84888137259
论文题名: Association between resistance to an introduced invasive pathogen and phenolic compounds that may serve as biomarkers in native oaks
作者: McPherson B.A. ; Mori S.R. ; Opiyo S.O. ; Conrad A.O. ; Wood D.L. ; Bonello P.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 312 起始页码: 154
结束页码: 160
语种: 英语
英文关键词: Coast live oak
; Ellagic acid
; Phytophthora ramorum
; Plant defense
; Quercus agrifolia
; Sudden oak death
Scopus关键词: Live oak
; Phytophthora ramorum
; Plant defense
; Quercus agrifolia
; Sudden oak death
; Forestry
; Mathematical models
; Methanol
; Plants (botany)
; Regression analysis
; Ellagic acid
; antioxidant
; beetle
; biomarker
; chemical defense
; deciduous tree
; disease incidence
; disease resistance
; forest management
; invasive species
; mortality
; native species
; pathogen
; pest species
; phenolic compound
; survival
; symptom
; Ellagic Acid
; Forestry
; Mathematical Models
; Methanol
; Plants
; Quercus
; Regression Analysis
; Ambrosia
; Coleoptera
; Fungi
; Hexapoda
; Oomycetes
; Phytophthora
; Phytophthora ramorum
; Quercus
; Quercus agrifolia
; Scolytinae
英文摘要: California coast live oaks (Quercus agrifolia Nee) have suffered large losses from sudden oak death, caused by the introduced oomycete Phytophthora ramorum. Infected mature coast live oaks exhibit cankers on the main stem that produce a viscous sap-derived exudate, referred to as bleeding. Subsequent attacks by ambrosia and bark beetles, followed by the activity of fungi introduced by these insects, have led to mortality levels greater than 50% since the mid-1990s. Despite an infection rate of 5% year-1, asymptomatic trees still persist in many heavily infected stands after more than 15years of exposure to the pathogen. We hypothesized that varying responses to P. ramorum, including apparent recovery from infections, reflected phenotypic differences in susceptibility. In this study we evaluated the relationship between the early development of symptoms in mature trees that were experimentally inoculated with P. ramorum and long-term survival. A logit model showed that external canker lengths measured 9months following inoculation predicted survival 7years later. We defined resistance to P. ramorum in the surviving trees as absence or cessation of bleeding after the 7years of the study and absence of beetle attacks on bleeding trees. Probability of resistance was also predicted by external canker length measured 9months after inoculation. Canker length distribution was consistent with quantitative resistance to P. ramorum. The role of plant chemistry in resistance was examined by quantifying soluble phenolics in phloem methanol extracts prepared from the surviving trees. A logistic regression model found that expression of resistance was associated with four phenolic compounds; ellagic acid and a partially characterized ellagic acid derivative, and two chromatographic peaks that represent two uncharacterized phenolic compounds. Ellagic acid and a crude methanol extract from coast live oak phloem (total phenolics) were fungistatic when assayed in vitro at physiologically relevant levels and total phenolics were fungicidal at the highest concentration tested. The association of certain phenolics with resistance may facilitate the use of biomarkers in minimally invasive assays to predict the response of trees to P. ramorum, thereby increasing the options for managing threatened forests. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66212
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720, United States; United States Department of Agriculture, Forest Service, Pacific Southwest Research Station, Albany, CA 94710, United States; Molecular and Cellular Imaging Center-Columbus, Ohio Agricultural Research and Development Center, The Ohio State University, Columbus, OH 43210, United States; Department of Plant Pathology, The Ohio State University, Columbus, OH 43210, United States
Recommended Citation:
McPherson B.A.,Mori S.R.,Opiyo S.O.,et al. Association between resistance to an introduced invasive pathogen and phenolic compounds that may serve as biomarkers in native oaks[J]. Forest Ecology and Management,2014-01-01,312