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Title: Mechanism of vector resistance in groundnut to control groundnut rosette virus disease in Sub-Saharan Africa
Author: Willekens, Jeroen
ISNI:       0000 0001 3568 6418
Awarding Body: University of Greenwich.
Current Institution: University of Greenwich
Date of Award: 2003
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Analysis of biological performance parameters of Aphis craccivora on groundnut variety ICG12991 in laboratory and field trials demonstrated that ICG12991 was resistant to the aphid vector of groundnut rosette diseases and that this resistance was stable over time and under high aphid pressure. Feeding experiments related slow population development and high aphid mortality on ICG 12991 to an inhibition of phloem feeding from the sieve elements. Consequently, virus transmission of all three agents of rosette disease was almost totally absent even under very high pressure of viruliferous aphids. Further investigation of the underlying mechanism of resistance in ICG 12991 showed that the resistance was induced by aphid probes rather than constitutive. The induced plant response was described as a hypersensitive response around the aphid feeding sites. Aphid-resistance and hypersensitivity were identified in at least 7 groundnut varieties and it is proposed that more varieties are likely to express these characteristics. The results led to the recommendation to evaluate groundnut varieties for aphid resistance by evaluating aphid population development. The identification of vector resistance and its efficacy in reducing virus spread of rosette disease in the field has opened the way for novel approaches for groundnut disease management.
Supervisor: Kimmins, Frances ; Stevenson, Philip ; Cheke, Robert Sponsor: Higher Education Funding Council for England (HEFCE)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: SB Plant culture