U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Application Technology Research: Wooster, OH
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                                    Software
                People

                    Staff Listing
                                    Careers


        


                    Departments
                        Agricultural Engineering
                                    Entomology
                                    Horticulture
                                    Plant Pathology
                                    IR-4 programSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Midwest Area Wooster, Ohio Application Technology Research Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Ranger, Christopheritem
                                            SINGH, A - RUTGERSitem
                                            JOHNSON-CICALESE, J - RUTGERSitem
                                            POLAVARAPU, S - RUTGERSitem
                                            VORSA, N - RUTGERS
  Submitted to: Journal of Chemical Ecology
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 1/24/2007
                                    Publication  Date: 4/1/2007
                                    Citation: Ranger, C.M., Singh, A.P., Johnson-Cicalese, J., Polavarapu, S., Vorsa, N. 2007. Intraspecific Variation in Aphid Resistance and Constitutive Phenolics Exhibited by the Wild Blueberry Vaccinium darrowi. Journal of Chemical Ecology. 33:711-729.Interpretive Summary: Viruses pose a considerable threat to the commercial production of highbush blueberries, Vaccinium corymbosum.  Aphids infesting cultivated blueberry fields are one of the primary modes of virus transmission from infected to healthy plants.  Managing aphid-transmitted viruses mainly occurs through insecticide applications and rouging infected plants.  Aphid-resistant cultivars could provide a multifaceted approach to aphid and virus management.  Since uncultivated blueberry species represent valuable sources of insect and disease resistance traits, wild accessions of V. darrowi were evaluated for resistance to the blueberry aphid, Illinoia pepperi.  Phenolics, which are documented to confer resistance to aphids, were also measured in leaves and stems of V. darrowi to determine if such compounds predicted resistance levels.  Several wild accessions of V. darrowi with resistance against I. pepperi were identified and are being used in a traditional breeding program to improve the resistance levels of existing cultivars.  A correlation was not detected between phenolics and aphid resistance, which means other plant factors need to be considered as indicators of resistance.
                                Technical Abstract: Illinoia pepperi (MacGillivray) infests cultivated highbush blueberries, Vaccinium corymbosum L., in the Northeastern United States.  Allopatric resistance to I. pepperi was examined using Vaccinium darrowi Camp, which evolved in the absence of I. pepperi in the Southeastern United States.  Vaccinium corymbosum cv. ‘Elliott’ was used as a susceptible control.  Between population variability in I. pepperi resistance was assessed by measuring length of the prereproductive period, fecundity, and survivorship on 14 V. darrowi accessions representing 11 discrete wild populations.  Length of I. pepperi’s prereproductive period and survivorship were not significantly affected.  However, significant differences were detected in fecundity and the intrinsic rate of increase (rm).  Within population variability in resistance was measured by confining 1st instars to 24 accessions from a single wild population of V. darrowi (NJ88-06).  Significant differences in the mean total number of aphids occurring after 20 d were only detected between 2 of the 24 V. darrowi accessions.  A greater degree of diversity in I. pepperi resistance exists between populations of V. darrowi compared to within a population.  Constitutive leaf and stem polyphenolics were also identified by HPLC-MS and quantified from 14 of the V. darrowi accessions.  The accessions varied considerably in concentrations of five phenolic acids and seven flavonol glycosides, but a correlation was not found between individual or total phenolics and aphid performance.  Overall, screening within and between populations of V. darrowi identified promising sources of aphid resistance, but phenolic acid and flavonol glycoside profiles did not predict resistance levels.  The mechanism of resistance remains to be identified.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov