Aphid Transmission of the Viruses Causing Chlorotic Rosette and Green Rosette Diseases of Peanut in Nigeria

Misari, S. M.; Abraham, Joel; Demski, J. W.; Kühn, Christina; Casper, R.; Breyel, E.

doi:10.1094/pd-72-0250

Cited by 15 publications

(11 citation statements)

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“…With time, this continuous "evolution" of GRD agents under strong selection pressure can lead to new disease patterns. For example, in Nigeria, a clear shift occurred from green to chlorotic rosette over a period of about 20 years (Naidu et al, 1999;Yayock et al, 1976;Misari et al, 1988). The shift could be due to changes in the genome sequences of GRD agents or to different vector biotypes and cropping patterns.…”

Section: Resultsmentioning

confidence: 99%

Groundnut rosette disease symptoms types distribution and management of the disease in Uganda

Okello¹,

Akello²,

Tukamuhabwa³

et al. 2014

Afr. J. Plant Sci.

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Groundnut rosette disease (GRD), caused by a complex of three agents: groundnut rosette assistor luteovirus, groundnut rosette umbravirus, and the associated satellite RNA, is a major groundnut disease in Uganda. Two main symptom types, chlorotic rosette and green rosette occur. A nationwide survey covering 23 districts was done in 2012 and 2013 to ascertain the predominant GRD symptom types, GRD incidences and severity, farmers' knowledge and their GRD coping mechanisms, the current groundnut seed system and farming practices. Data were analysed using SPSS and Chi-square tests of association. Mean GRD severity scores were geo-referenced and plotted on the Uganda map. Most respondent (52%) were females. Other than Northern Uganda, most regions grow groundnut landraces. Major seed sources were home saved and marketed. Thirty six percent of farmers grew groundnuts after cereals as recommended. All the farmers sampled knew about and had seen both rosette symptoms types, which were more visible during the second rains. A whole 42% of the farmers have no coping mechanism against GRD. The current knowledge of GRD did not have a significant effect on its management, seed source, varieties grown or gender of the farmers. The green rosette type predominates, making Uganda a green rosette belt.

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Section: Resultsmentioning

confidence: 99%

Groundnut rosette disease symptoms types distribution and management of the disease in Uganda

Okello¹,

Akello²,

Tukamuhabwa³

et al. 2014

Afr. J. Plant Sci.

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show abstract

“…With time, this continuous "evolution" of groundnut rosette disease agents under strong selection pressure can lead to new disease patterns. For example, in Nigeria, a clear shift occurred from green to chlorotic rosette over a period of about 20 years (43,50,84). The shift could be due to changes in the genome sequences of the groundnut rosette disease agents or to different vector biotypes and cropping patterns.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, all virus particles, irrespective of whether they contain GRAV RNA or GRV RNA and sat RNA, are acquired by the aphid vector from phloem sap. Once acquired, the aphid can potentially transmit virus particles for up to 14 days and possibly for life (43,71,81 …”

Section: Biology Of Groundnut Rosette Diseasementioning

confidence: 99%

Groundnut Rossette: A Virus Disease Affecting Groundnut Production in Sub-Saharan Africa

Naidu¹,

Kimmins

Deom

et al. 1999

Plant Disease

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“…Nonetheless, vector transmission characteristics of groundnut rosette disease seem to be different from the persistent type of transmission, characteristic of luteoviruses. Earlier studies (6,14) have reported a long acquisition access period (AAP; about 4 h for chlorotic rosette and 8 h for green rosette) and latent period (LP; median of 26.4 and 38.4 h for chlorotic and green rosette, respectively), but a brief inoculation access period (IAP; less than 10 min for either chlorotic or green rosette) for aphid transmission of the disease. In these studies, successful transmission was assessed by the appearance of groundnut rosette disease symptoms in the inoculated plants; therefore, the results strictly refer to transmission of GRV and its sat RNA.…”

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confidence: 99%

Spatiotemporal Separation of Groundnut Rosette Disease Agents

Naidu¹,

Kimmins²,

Holt³

et al. 1999

Phytopathology®

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Analysis by triple-antibody sandwich enzyme-linked immunosorbent assay of groundnut samples from fields in two seasons from different regions of Malawi showed the absence of groundnut rosette assistor virus (GRAV) from some plants showing groundnut rosette disease symptoms and the presence of GRAV in some symptomless plants. Viruliferous Aphis craccivora collected from fields transmitted either GRAV alone, groundnut rosette virus (GRV) with its satellite RNA (sat RNA), or all three agents together, in different proportions. More plants became infected with all three agents when increasing numbers of potentially viruliferous aphids were used per plant, suggesting a dosage response. Electrical pentration graph studies of aphid stylet activities indicated successful transmission of GRV and its sat RNA during both the "stylet pathway phase" and salivation into sieve elements, whereas GRAV was transmitted only during the latter phase. Aphids transmitted all three agents together only during the salivation phase. Reverse-transcriptase polymerase chain reaction testing of viruliferous aphids and of inoculated plants revealed no correlation between the presence of all three agents in prospective aphid vectors and their simultaneous transmission to groundnut plants. These results show that separation of the groundnut rosette disease agents occurs over time and space.

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Aphid Transmission of the Viruses Causing Chlorotic Rosette and Green Rosette Diseases of Peanut in Nigeria

Cited by 15 publications

References 0 publications

Groundnut rosette disease symptoms types distribution and management of the disease in Uganda

Groundnut rosette disease symptoms types distribution and management of the disease in Uganda

Groundnut Rossette: A Virus Disease Affecting Groundnut Production in Sub-Saharan Africa

Spatiotemporal Separation of Groundnut Rosette Disease Agents

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