• Contact Us
    • Send Feedback
    • Login
    View Item 
    •   Home
    • Journal and Journal Articles
    • Journal and Journal Articles
    • View Item
    •   Home
    • Journal and Journal Articles
    • Journal and Journal Articles
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    Whole Repository
    CollectionsIssue DateRegionCountryHubAffiliationAuthorsTitlesSubject
    This Sub-collection
    Issue DateRegionCountryHubAffiliationAuthorsTitlesSubject

    My Account

    Login

    Welcome to the International Institute of Tropical Agriculture Research Repository

    What would you like to view today?

    Identification of okra (Abelmoschus spp.) accessions resistant to aphid (Aphis gossypii Glover) in Cameroon

    Thumbnail
    View/Open
    S14ArtAbangIdentificationInthomDev.pdf (431.1Kb)
    Date
    2014
    Author
    Abang, A.F.
    Srinivasan, R.
    Kekeunou, S.
    Hanna, R.
    Chagomoka, Takemore
    Chang, J.C.
    Bilong-Bilong, C.F.
    Type
    Journal Article
    Metadata
    Show full item record
    Abstract/Description
    Okra germplasm collected from different locations around the world were screened atAVRDC(TheWorldVegetable Center) in 2011 and 2012 to identify germplasm resistant to themelon aphid (Aphis gossypii) for use in sub-Saharan Africa. A total of 260 okra accessions andvarieties were screened (150 at AVRDC Taiwan and 110 at AVRDC Cameroon), whichincluded four varieties commercially available in Cameroon. The experiments wereconducted under natural infestation in Shanhua, Taiwan, and at Yaoundé, Cameroon. Sincethe preliminary screening trials were conducted in Taiwan and Cameroon, the aphidpopulations in these two countries were compared. A total of 60 insects was used forcytochrome c oxidase I (COI) gene sequencing and phylogenetic analysis. The nucleotidesequences of all the populations showed 100 % similarity and the phylogenetic analysisconfirmed the genetic similarity of A. gossypii in Taiwan and Cameroon. Results of thescreening trials showed that three accessions (VI033805, VI036213 and VI051114) wereresistant to A. gossypii. The basis of resistance of the three okra accessions was elucidated bystudying their biochemical and biophysical properties. There was no significant differencebetween the susceptible and resistant okra accessions in terms of leaf tannins, free aminoacids, total sugars and total phenols. Only total nitrogen was significantly different betweenthe susceptible and the two resistant okra accessions with the lowest aphid infestation(VI033805 and VI036213). Thus, higher leaf nitrogen content seems to favour the aphidinfestation on okra. For physical parameters, there was no significant difference among theaccessions in trichome density of bottom and middle leaves, and leaf toughness. However,trichome density in the younger leaves of resistant VI033805 was significantly higher thansusceptible VI057245. Studies on settling behaviour showed that aphids did not discriminatebetween the susceptible and resistant okra accessions for oviposition and feeding 72 h afterrelease.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1039
    Agrovoc Terms
    Aphid; Biochemical; Okra; Aphis Gossypii
    Regions
    Africa; West Africa
    Countries
    Cameroon
    Journals
    African Entomology
    Collections
    • Journal and Journal Articles4835
    copyright © 2019  IITASpace. All rights reserved.
    IITA | Open Access Repository