Components of resistance of cassava to African cassava mosaic virus

Fargette, Denis; Colon, L.T.; Bouveau, R.; Fauquet, Claude

doi:10.1007/bf01877245

Cited by 56 publications

(66 citation statements)

References 16 publications

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“…(d) Breeding for resistance and tolerance Breeding for resistance is widely advocated as the key strategy for disease control in cassava and sweet potato (Fargette et al 1996;Aritua et al 1998;Morales 2001;Lapidot & Friedmann 2002;Diaz-Pendon et al 2004;Ariyo et al 2005;Thresh & Cooter 2005). Although at present there is little evidence of resistance breakdown (Thresh & Cooter 2005) in cassava and sweet potato, the appearance of virulent virus strains is a problem in many crops worldwide as it can render the resistance redundant.…”

Section: Resultsmentioning

confidence: 99%

“…These strategies include plant breeding for resistance to the virus (Fargette et al 1996;Aritua et al 1998;Morales 2001;Lapidot & Friedmann 2002;Diaz-Pendon et al 2004;Ariyo et al 2005;Thresh & Cooter 2005), the control of vectors (Palumbo et al 2001), as well as crop sanitation through removal of diseased plants (Gibson & Aritua 2002;Thresh & Cooter 2005) and improved selection/production of planting material (Thro et al 1999;Feng et al 2000;Monger et al 2001;Gibson & Aritua 2002;Alleman et al 2004) for these vegetatively propagated crops.…”

Section: Introductionmentioning

confidence: 99%

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Disease control and its selection for damaging plant virus strains in vegetatively propagated staple food crops; a theoretical assessment

2006

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Viral diseases are a key constraint in the production of staple food crops in lesser developed countries. New and improved disease control methods are developed and implemented without consideration of the selective pressure they impose on the virus. In this paper, we analyse the evolution of within-plant virus titre as a response to the implementation of a range of disease control methods. We show that the development of new and improved disease control methods for viral diseases of vegetatively propagated staple food crops ought to take the evolutionary responses of the virus into consideration. Not doing so leads to a risk of failure, which can result in considerable economic losses and increased poverty. Specifically in vitro propagation, diagnostics and breeding methods carry a risk of failure due to the selection for virus strains that build up a high within-plant virus titre. For vegetatively propagated crops, sanitation by roguing has a low risk of failure owing to its combination of selecting for low virus titre strains as well as increasing healthy crop density.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Disease control and its selection for damaging plant virus strains in vegetatively propagated staple food crops; a theoretical assessment

2006

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“…According to Fargette et al (1996) working on Cassava mosaic virus (CMV), some tolerant cultivars may co-exist with the virus without showing symptoms. Similar scenario could be happening with CBSV.…”

Section: Discussionmentioning

confidence: 99%

Relationship between Symptoms Expression and Virus Detection in Cassava Brown Virus Streak-Infected Plants

Rwegasira¹,

Rey²

2012

JAS

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Diagnosis of Cassava brown streak disease (CBSD) has for long been based on foliar and root symptoms expression on infected plants. Variability in patterns of symptoms expression between varieties and seasons however, has meant that symptom-based diagnostics are unreliable. The current study established the relationship between symptom expression on cassava plants and the infection with Cassava brown streak virus (CBSV) using RT-PCR diagnostic tool. It was established that manifestation of CBSD-like symptoms (particularly the foliar chloroses and necrotic blotches) may not be an absolute indication of CBSV-infection. Only 67% of tested samples were both foliarly symptomatic and infected by the virus. About 22% of samples were free from CBSV despite being foliarly symptomatic and 7% were CBSV-infected but foliarly symptom less. Some CBSV-infected plants did not exhibit any foliar symptoms although had root necroses. A few CBSV-free plants were regenerated from infected cuttings in one of the four tested cultivars, Albert. Five out of fifteen (33%) plants cv. Albert were symptom less and two out of the five (40%) were CBSV-free. The findings from this study suggest that symptoms-based diagnosing for CBSV infections is unreliable. As some of CBSV-infected plants tend to be considered CBSV-free due to lack of the disease symptoms, the scenario might have contributed to unlimited spread of CBSD through latently-infected planting materials.

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“…Various approaches to control are possible, as discussed in detail elsewhere . However, the main attention has been given to the use of resistant varieties (Fargette et al, 1996;Thresh et al, 1998a) and phytosanitation, involving the use of CMD-free planting material and the removal (roguing) of any additional diseased plants that occur .…”

Section: Control Measuresmentioning

confidence: 99%