The roles of plant secondary metabolites from cowpea floral structures in resistance to the flower bud thrips

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dc.creatorAlabi, O.Y.
dc.creatorOdebiyi, J.A.
dc.creatorTamò, Manuele
dc.creatorOmoloye, A.A.
dc.date2011-06-20
dc.date2017-08-31T12:19:40Z
dc.date2017-08-31T12:19:40Z
dc.date.accessioned2026-06-27T15:51:08Z
dc.descriptionFloral structures of six cowpea (Vigna unguiculata) cultivars were analysed for secondary plant metabolites (polyphenols, terpenoids and flavonoids) to study their relationships with resistance to Megalurothrips sjostedti (Trybom). Polyphenols varied significantly (P < 0.001) among the floral structures of the cultivars at the same growth stage. Significant negative correlations were obtained between polyphenols and damage indices (r = -0.57), mean adult counts (r = -0.56) and mean larval counts (r = -0.64) of resistant cowpea cultivars especially in the late season, indicating that polyphenols play a significant role in cowpea resistance to M. sjostedti. High levels of polyphenols obtained from Sanzibanili and Sewe cultivars, coupled with highly significant correlations between the polyphenols and thrips population on resistant cultivars, and their damage indices, suggests that these polyphenols could be inhibitors or deterrents in this case. Terpenoid extracts (10 mg/mL) of IT90K-277-2, Sewe, Sanzibanili, TVu 1509 and KV × 404-8-1 racemes; KV × 404-8-1 and TVu 1509 floral buds; IT90K-277-2, Sewe and Sanzibanili flowers caused significant (P < 0.001) larval mortalities, since mortality ranged between 56.7%-96.7%. Hence terpenoid extracts from floral structures of the cultivars are biologically active and confers antibiotic resistance to M. sjostedti larvae; this compound could be promising candidates for genetic transformation of cowpea cultivars.
dc.identifierhttps://hdl.handle.net/10568/83300
dc.identifier.urihttp://hdl.handle.net/123456789/115366
dc.languageen
dc.rightsLimited Access
dc.sourceAlabi, O.Y., Odebiyi, J.A., Tamo, M. & Omoloye, A.A. (2011). The roles of plant secondary metabolites from cowpea floral structures in resistance to the flower bud thrips. Journal of Agricultural Science and Technology A, 262-269.
dc.subjectvigna unguiculata
dc.subjectterpenoids
dc.subjectflavonoids
dc.subjectpolyphenols
dc.subjectcowpeas
dc.subjectcultivars
dc.subjectmetabolites
dc.subjectflower bud thrips
dc.subjecthost plant resistance
dc.titleThe roles of plant secondary metabolites from cowpea floral structures in resistance to the flower bud thrips
dc.typeJournal Article

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Instituto Internacional de Agricultura Tropical (IITA)