Willekens, Jeroen (2003) Mechanism of vector resistance in groundnut to control groundnut rosette virus disease in Sub-Saharan Africa. PhD thesis, University of Greenwich.

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Abstract

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.

Item Type:	Thesis (PhD)
Additional Information:	uk.bl.ethos.399351
Uncontrolled Keywords:	disease management; groundnut rosette virus disease;
Subjects:	S Agriculture > SB Plant culture
Pre-2014 Departments:	School of Science School of Science > Natural Resources Institute
Last Modified:	13 Feb 2019 11:25
URI:	http://gala.gre.ac.uk/id/eprint/6344

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