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Kepngop LRK, Wosula EN, Amour M, Ghomsi PGT, Wakam LN, Kansci G, Legg JP. Genetic Diversity of Whiteflies Colonizing Crops and Their Associated Endosymbionts in Three Agroecological Zones of Cameroon. INSECTS 2024; 15:657. [PMID: 39336625 PMCID: PMC11432237 DOI: 10.3390/insects15090657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2024] [Revised: 08/23/2024] [Accepted: 08/28/2024] [Indexed: 09/30/2024]
Abstract
Bemisia tabaci (Gennadius) is as a major pest of vegetable crops in Cameroon. These sap-sucking insects are the main vector of many viruses infecting plants, and several cryptic species have developed resistance against insecticides. Nevertheless, there is very little information about whitefly species on vegetable crops and the endosymbionts that infect them in Cameroon. Here, we investigated the genetic diversity of whiteflies and their frequency of infection by endosymbionts in Cameroon. Ninety-two whitefly samples were collected and characterized using mitochondrial cytochrome oxidase I (mtCOI) markers and Kompetitive Allele Specific PCR (KASP). The analysis of mtCOI sequences of whiteflies indicated the presence of six cryptic species (mitotypes) of Bemisia tabaci, and two distinct clades of Bemisia afer and Trialeurodes vaporariorum. Bemisia tabaci mitotypes identified included: MED on tomato, pepper, okra, and melon; and SSA1-SG1, SSA1-SG2, SSA1-SG5, SSA3, and SSA4 on cassava. The MED mitotype predominated in all regions on the solanaceous crops, suggesting that MED is probably the main phytovirus vector in Cameroonian vegetable cropping systems. The more diverse cassava-colonizing B. tabaci were split into three haplogroups (SNP-based grouping) including SSA-WA, SSA4, and SSA-ECA using KASP genotyping. This is the first time that SSA-ECA has been reported in Cameroon. This haplogroup is predominant in regions currently affected by the severe cassava mosaic virus disease (CMD) and cassava brown streak virus disease (CBSD) pandemics. Three endosymbionts including Arsenophonus, Rickettsia, and Wolbachia were present in female whiteflies tested in this study with varying frequency. Arsenophonus, which has been shown to influence the adaptability of whiteflies, was more frequent in the MED mitotype (75%). Cardinium and Hamiltonella were absent in all whitefly samples. These findings add to the knowledge on the diversity of whiteflies and their associated endosymbionts, which, when combined, influence virus epidemics and responses to whitefly control measures, especially insecticides.
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Affiliation(s)
- Lanvin R. K. Kepngop
- Laboratory for Phytobiochemistry and Medicinal Plants Studies, Antimicrobial & Biocontrol Agents Unit (AmBcAU), Department of Biochemistry, Faculty of Science, University of Yaoundé 1, Yaoundé P.O. Box 337, Cameroon
| | - Everlyne N. Wosula
- International Institute of Tropical Agriculture, Dar es Salaam P.O. Box 34441, Tanzania
| | - Massoud Amour
- International Institute of Tropical Agriculture, Dar es Salaam P.O. Box 34441, Tanzania
| | - Pierre G. T. Ghomsi
- Laboratory for Phytobiochemistry and Medicinal Plants Studies, Antimicrobial & Biocontrol Agents Unit (AmBcAU), Department of Biochemistry, Faculty of Science, University of Yaoundé 1, Yaoundé P.O. Box 337, Cameroon
| | - Louise N. Wakam
- Laboratory for Phytobiochemistry and Medicinal Plants Studies, Antimicrobial & Biocontrol Agents Unit (AmBcAU), Department of Biochemistry, Faculty of Science, University of Yaoundé 1, Yaoundé P.O. Box 337, Cameroon
| | - Germain Kansci
- Laboratory of Food Science and Nutrition, Department of Biochemistry, Faculty of Science, University of Yaoundé 1, Yaoundé P.O. Box 337, Cameroon
| | - James P. Legg
- International Institute of Tropical Agriculture, Dar es Salaam P.O. Box 34441, Tanzania
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Kumar V, Subramanian J, Marimuthu M, Subbarayalu M, Ramasamy V, Gandhi K, Ariyan M. Diversity and functional characteristics of culturable bacterial endosymbionts from cassava whitefly biotype Asia II-5, Bemisia tabaci. 3 Biotech 2024; 14:100. [PMID: 38456084 PMCID: PMC10914660 DOI: 10.1007/s13205-024-03949-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 01/28/2024] [Indexed: 03/09/2024] Open
Abstract
Whitefly Bemisia tabaci, a carrier of cassava mosaic disease (CMD), poses a significant threat to cassava crops. Investigating culturable bacteria and their impact on whiteflies is crucial due to their vital role in whitefly fitness and survival. The whitefly biotype associated with cassava and transmitting CMD in India has been identified as Asia II 5 through partial mitochondrial cytochrome oxidase I gene sequencing. In this study, bacteria associated with adult B. tabaci feeding on cassava were extracted using seven different media. Nutrient Agar (NA), Soyabean Casein Digest Medium (SCDM), Luria Bertani agar (LBA), and Reasoner's 2A agar (R2A) media resulted in 19, 6, 4, and 4 isolates, respectively, producing a total of 33 distinct bacterial isolates. Species identification through 16SrRNA gene sequencing revealed that all isolates belonged to the Bacillota and Pseudomonadota phyla, encompassing 11 genera: Bacillus, Cytobacillus, Exiguobacterium, Terribacillus, Brevibacillus, Enterococcus, Staphylococcus, Brucella, Novosphingobium, Lysobacter, and Pseudomonas. All bacterial isolates were tested for chitinase, protease, siderophore activity, and antibiotic sensitivity. Nine isolates exhibited chitinase activity, 28 showed protease activity, and 23 displayed siderophore activity. Most isolates were sensitive to antibiotics such as Vancomycin, Streptomycin, Erythromycin, Kanamycin, Doxycycline, Tetracycline, and Ciprofloxacin, while they demonstrated resistance to Bacitracin and Colistin. Understanding the culturable bacteria associated with cassava whitefly and their functional significance could contribute to developing effective cassava whitefly and CMD control in agriculture. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-024-03949-0.
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Affiliation(s)
- Venkatesh Kumar
- Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641003 India
| | - Jeyarani Subramanian
- Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641003 India
| | - Murugan Marimuthu
- Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641003 India
| | - Mohankumar Subbarayalu
- Department of Plant Biotechnology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641003 India
| | - Venkatachalam Ramasamy
- Department of Genetics and Plant Breeding, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641003 India
| | - Karthikeyan Gandhi
- Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641003 India
| | - Manikandan Ariyan
- Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
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Namuddu A, Seal S, van Brunschot S, Malka O, Kabaalu R, Morin S, Omongo C, Colvin J. Distribution of Bemisia tabaci in different agro-ecological regions in Uganda and the threat of vector-borne pandemics into new cassava growing areas. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2023. [DOI: 10.3389/fsufs.2023.1068109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Previous studies in sub-Saharan Africa have showed the spread of cassava mosaic disease (CMD) and cassava brown streak disease (CBSD) pandemics into different cassava growing regions by high Bemisia tabaci populations. Studies did indicate that there were stark differences in some whitefly species, yet they have not looked extensively across agroecologies. Members of B. tabaci species complex termed sub-Saharan Africa 1 (SSA1) and SSA2 have been linked to the spread of CMD and CBSD viruses. During the period of a severe CMD pandemic in the 1990s, SSA2 was the most predominant until the resurgence of SSA1, particularly SSA1-subgroup1 (SSA1-SG1) from the early 2000s to date. Cassava being a drought resilient crop has become an important food security crop and has been introduced into new areas and regions. Considering the role B. tabaci in the spread of cassava virus pandemics into neighboring regions, we investigated the genetic diversity and distribution of B. tabaci in nine different agro-ecological regions of Uganda in 2017. Adult whiteflies were collected from cassava and 33 other host plants from cassava-growing areas, those with limited cassava and areas with no cassava, where it is being introduced as a food security crop. The partial sequences of the mitochondrial cytochrome oxidase 1 (mtCO1) gene (657 bp) were used to determine the phylogenetic relationships between the sampled B. tabaci. Cassava B. tabaci SSA1 (-SG1, -SG2, -Hoslundia (previously called SSA1-SG1/2), -SG3), SSA2 and SSA3; non-cassava B. tabaci SSA6, SSA10, SSA11, SSA12, SSA13, MED-ASL, MED-Q1, MEAM1, Indian Ocean; and other Bemisia species, Bemisia afer and Bemisia Uganda1 were identified in the study. SSA3, one of the key B. tabaci species that occurs on cassava in West Africa, was identified for the first time in Uganda. The SSA1-SG1 was widely distributed, predominated on cassava and was found on 17 other host-plants. The ability of SSA1-SG1 to exist in environments with limited or no cassava growing poses the risk of continued spread of virus pandemics. Therefore, measures must be put in place to prevent the introduction of diseased materials into new areas, since the vectors exist.
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N’cho AJ, Seka K, Assiri KP, Simiand C, Otron DH, Ochou G, Konan KAJ, Kouadio MF, Fondio L, Atta Diallo H, Martin T, Delatte H. Genetic diversity of whitefly species of the Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) species complex, associated with vegetable crops in Côte d'Ivoire. PLoS One 2022; 17:e0276993. [PMID: 36315574 PMCID: PMC9621431 DOI: 10.1371/journal.pone.0276993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 10/17/2022] [Indexed: 11/05/2022] Open
Abstract
Since several years, whiteflies of the species complex of Bemisia tabaci (Gennadius) are causing several damages on vegetable crops in Côte d’Ivoire. These sap-sucking insects are the main vector of many viruses on tomato and several species of this complex have developed resistances against insecticides. Nevertheless, there is very little information about whitefly species on vegetable crops in Côte d’Ivoire. Here, we investigated the species diversity and their genetic diversity and structuring on samples from vegetable crops in the major tomato production areas of Côte d’Ivoire. To assess this diversity, 535 whitefly samples from different localities and plant species were collected and analysed with nuclear (microsatellite) and mitochondrial (mtCOI) markers. In each site, and ecological data were recorded, including whiteflies abundance and plant species colonised by B. tabaci. The analysis of mtCOI sequences of whiteflies indicated the presence of four cryptic species on tomato and associated crops in Côte d’Ivoire. These were MED ASL, MED Q1, SSA 1 and SSA3. The MED ASL species dominated over all samples in the different regions and plant species. One haplotype of MED ASL out of the 15 identified predominated on most plant species and most sites. These results suggested that MED ASL is probably the main phytovirus vector in the Ivorian vegetable cropping areas. In contrast, only five haplotypes of MED Q1 were identified on vegetables but in the cotton-growing areas of the country. Its low prevalence, low nuclear and mitochondrial diversity might indicate a recent invasion of this species on vegetable crops in Côte d’Ivoire. The Bayesian nuclear analysis indicated the presence of hybrid genotypes between the two main species MED ASL and MED Q1, however in low prevalence (10%). All these results highlight the need to maintain whitefly populations monitoring for a more effective management in Côte d’Ivoire.
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Affiliation(s)
- Anthelme-Jocelin N’cho
- Cirad, UMR PVBMT, Saint-Pierre, La Réunion, France
- Nangui Abrogoua University, Abidjan, Côte d’Ivoire
- National Center for Agricultural Research (CNRA), Bouaké, Côte d’Ivoire
- University of Montpellier, Cirad, UR Hortsys, Montpellier, France
- * E-mail: (AJN); (HD)
| | - Koutoua Seka
- Nangui Abrogoua University, Abidjan, Côte d’Ivoire
| | | | | | | | - Germain Ochou
- National Center for Agricultural Research (CNRA), Bouaké, Côte d’Ivoire
| | - Kouassi Arthur Jocelin Konan
- National Center for Agricultural Research (CNRA), Bouaké, Côte d’Ivoire
- Felix Houphouet Boigny University of Cocody, Abidjan, Côte d’Ivoire
| | - Marie-France Kouadio
- National Center for Agricultural Research (CNRA), Bouaké, Côte d’Ivoire
- Felix Houphouet Boigny University of Cocody, Abidjan, Côte d’Ivoire
| | - Lassina Fondio
- National Center for Agricultural Research (CNRA), Bouaké, Côte d’Ivoire
| | | | - Thibaud Martin
- University of Montpellier, Cirad, UR Hortsys, Montpellier, France
- Felix Houphouet Boigny University of Cocody, Abidjan, Côte d’Ivoire
| | - Hélène Delatte
- Cirad, UMR PVBMT, Antananarivo, Madagascar
- * E-mail: (AJN); (HD)
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Shirima RR, Wosula EN, Hamza AA, Mohammed NA, Mouigni H, Nouhou S, Mchinda NM, Ceasar G, Amour M, Njukwe E, Legg JP. Epidemiological Analysis of Cassava Mosaic and Brown Streak Diseases, and Bemisia tabaci in the Comoros Islands. Viruses 2022; 14:v14102165. [PMID: 36298720 PMCID: PMC9608219 DOI: 10.3390/v14102165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/15/2022] [Accepted: 09/28/2022] [Indexed: 01/20/2023] Open
Abstract
A comprehensive assessment of cassava brown streak disease (CBSD) and cassava mosaic disease (CMD) was carried out in Comoros where cassava yield (5.7 t/ha) is significantly below the African average (8.6 t/ha) largely due to virus diseases. Observations from 66 sites across the Comoros Islands of Mwali, Ngazidja, and Ndzwani revealed that 83.3% of cassava fields had foliar symptoms of CBSD compared with 95.5% for CMD. Molecular diagnostics confirmed the presence of both cassava brown streak ipomoviruses (CBSIs) and cassava mosaic begomoviruses (CMBs). Although real-time RT-PCR only detected the presence of one CBSI species (Cassava brown streak virus, CBSV) the second species (Ugandan cassava brown streak virus, UCBSV) was identified using next-generation high-throughput sequencing. Both PCR and HTS detected the presence of East African cassava mosaic virus (EACMV). African cassava mosaic virus was not detected in any of the samples. Four whitefly species were identified from a sample of 131 specimens: Bemisia tabaci, B. afer, Aleurodicus dispersus, and Paraleyrodes bondari. Cassava B. tabaci comprised two mitotypes: SSA1-SG2 (89%) and SSA1-SG3 (11%). KASP SNP genotyping categorized 82% of cassava B. tabaci as haplogroup SSA-ESA. This knowledge will provide an important base for developing and deploying effective management strategies for cassava viruses and their vectors.
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Affiliation(s)
- Rudolph Rufini Shirima
- International Institute of Tropical Agriculture (IITA-Tanzania), P.O. Box 34441, Dar es Salaam 14112, Tanzania
- Correspondence: ; Tel.: +25-52-2270-0092
| | - Everlyne Nafula Wosula
- International Institute of Tropical Agriculture (IITA-Tanzania), P.O. Box 34441, Dar es Salaam 14112, Tanzania
| | - Abdou Azali Hamza
- Institut National de Recherche pour L’Agriculture, La Pêche et L’Environnement (INRAPE), Moroni BP 1406, Comoros
| | - Nobataine Ali Mohammed
- Institut National de Recherche pour L’Agriculture, La Pêche et L’Environnement (INRAPE), Moroni BP 1406, Comoros
| | - Hadji Mouigni
- Institut National de Recherche pour L’Agriculture, La Pêche et L’Environnement (INRAPE), Moroni BP 1406, Comoros
| | - Salima Nouhou
- Institut National de Recherche pour L’Agriculture, La Pêche et L’Environnement (INRAPE), Moroni BP 1406, Comoros
| | - Naima Mmadi Mchinda
- Institut National de Recherche pour L’Agriculture, La Pêche et L’Environnement (INRAPE), Moroni BP 1406, Comoros
| | - Gloria Ceasar
- International Institute of Tropical Agriculture (IITA-Tanzania), P.O. Box 34441, Dar es Salaam 14112, Tanzania
| | - Massoud Amour
- International Institute of Tropical Agriculture (IITA-Tanzania), P.O. Box 34441, Dar es Salaam 14112, Tanzania
| | - Emmanuel Njukwe
- West and Central African Council for Agricultural Research and Development (CORAF), Dakar CP 18523, Senegal
| | - James Peter Legg
- International Institute of Tropical Agriculture (IITA-Tanzania), P.O. Box 34441, Dar es Salaam 14112, Tanzania
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Casinga CM, Wosula EN, Sikirou M, Shirima RR, Munyerenkana CM, Nabahungu LN, Bashizi BK, Ugentho H, Monde G, Legg JP. Diversity and Distribution of Whiteflies Colonizing Cassava in Eastern Democratic Republic of Congo. INSECTS 2022; 13:849. [PMID: 36135550 PMCID: PMC9504715 DOI: 10.3390/insects13090849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 08/31/2022] [Indexed: 06/16/2023]
Abstract
The present study characterizes Bemisia tabaci and Bemisia afer from cassava in eastern Democratic Republic of Congo (DRC). The Mitochondrial COI sequencing revealed the occurrence of six cassava B. tabaci mitotypes, which were designated into four haplogroups (SSA-ECA, SSA-CA, SSA2, and SSA-ESA) using KASP SNP genotyping. SSA-ECA (72%) was the most prevalent and occurred in the northern part of the surveyed area, in the Ituri and Nord/Sud-Kivu provinces, whilst SSA-CA (21%) was present in the south, primarily in Haut-Katanga. SSA-ECA was predominant in the areas of north-eastern DRC most severely affected by cassava brown streak disease and was also reported in the new outbreak area in Pweto territory, Haut-Katanga, in the south. Bemisia afer comprised two major clusters with 85.5% of samples in cluster one, while the rest were in cluster two, which has no reference sequence in GenBank. This study provides important information on the genetic diversity of B. tabaci and B. afer in eastern DRC. This knowledge will be used as a basis for further studies to understand and to identify the role of whitefly haplogroups, their population densities and consequences for virus epidemics and spread as well as leading to improved vector and virus management strategies.
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Affiliation(s)
- Clérisse M. Casinga
- International Institute of Tropical Agriculture, Bukavu-Kalambo, Bukavu, Democratic Republic of the Congo
- Department of Environmental Sciences, Université du Cinquantenaire de Lwiro, Kabare, Bukavu, Democratic Republic of the Congo
| | - Everlyne N. Wosula
- International Institute of Tropical Agriculture, Dar es Salaam, Tanzania
| | - Mouritala Sikirou
- International Institute of Tropical Agriculture, Kinshasa, Democratic Republic of the Congo
| | - Rudolph R. Shirima
- International Institute of Tropical Agriculture, Dar es Salaam, Tanzania
| | - Carine M. Munyerenkana
- International Institute of Tropical Agriculture, Bukavu-Kalambo, Bukavu, Democratic Republic of the Congo
| | - Leon N. Nabahungu
- International Institute of Tropical Agriculture, Bukavu-Kalambo, Bukavu, Democratic Republic of the Congo
| | - Benoit K. Bashizi
- International Institute of Tropical Agriculture, Bukavu-Kalambo, Bukavu, Democratic Republic of the Congo
| | - Henry Ugentho
- Programme National Manioc, Institut National d’Etude et de Recherche Agronomiques de Mulungu, Bukavu-Mulungu, Democratic Republic of the Congo
| | - Godefroid Monde
- Department of Plant Virology, Institut Facultaire des Sciences Agronomiques, Kisangani-Yangambi, Kisangani, Democratic Republic of the Congo
| | - James P. Legg
- International Institute of Tropical Agriculture, Dar es Salaam, Tanzania
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Distribution of invasive versus native whitefly species and their pyrethroid knock-down resistance allele in a context of interspecific hybridization. Sci Rep 2022; 12:8448. [PMID: 35589927 PMCID: PMC9120063 DOI: 10.1038/s41598-022-12373-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 04/28/2022] [Indexed: 12/24/2022] Open
Abstract
The invasion success of a species in an agrosystem is greatly influenced by environmental factors such as the use of insecticides, by the intrinsic evolutionary capabilities of the species, and also by interactions with resident species. On the island of La Réunion, the successive invasions of MEAM1 and MED whitefly species over the last 20 years have not only led an increased use of insecticides, but have also challenged the resident IO species. To trace the evolution of the 3 species, and the distribution of the kdr mutation (resistance to pyrethroid) in the para-type voltage-gated sodium channel, we genotyped 41 populations (using neutral nuclear markers) and look at the prevalence of the kdr allele. MEAM1 was predominantly present in agrosystems showing quasi fixation of the resistant kdr allele whereas IO was mainly in natural environments and did not have any resistant allele. Hybridization between the two former species was detected in low frequency but has not led to introgression of resistant alleles in the resident species so far. MED showed a limited distribution in agrosystems but all individuals displayed a resistant allele. These highly contrasting patterns of distribution and resistant mutations between invasive and resident whitefly species are further discussed.
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Distribution and Molecular Diversity of Whitefly Species Colonizing Cassava in Kenya. INSECTS 2021; 12:insects12100875. [PMID: 34680644 PMCID: PMC8541676 DOI: 10.3390/insects12100875] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/02/2021] [Accepted: 09/04/2021] [Indexed: 11/25/2022]
Abstract
Simple Summary The whitefly, Bemisia tabaci (Gennadium, Hemiptera) is a crop pest and plant-virus vector known to transmit more than 300 plant viruses. Among other plant viruses, the vector transmits viruses that cause the two major devastating viral diseases of cassava in sub-Saharan Africa namely cassava mosaic disease (CMD) and cassava brown streak disease (CBSD). In order to achieve effective implementation of whitefly management programs including prevention of spread of the species, accurate species identification is vital. Morphological identification approaches toward whitefly species limits the capacity to accurately identify new species, especially the presence of cryptic species such as the numerous B. tabaci genetic groups. Using the mitochondrial DNA cytochrome oxidase 1 (mtCO1) sequences, four distinct whitefly species namely Bemisia tabaci, Bemisia afer, Aleurodicus dispersus and Paraleyrodes bondari were identified in samples collected from major cassava growing regions in Kenya. The study presents the first report of P. bondari (Bondar’s nesting whitefly) on cassava in Kenya. We found three B. tabaci genetic groups of SSA1, SSA2 and Indian Ocean (IO) putative species colonizing cassava in Kenya. The information is useful to inform better management strategies of the whitefly vectors to reduce the impact of cassava viral diseases, which continue to be a threat to food security in major cassava growing regions. Abstract The whitefly, Bemisia tabaci (Gennadium, Hemiptera) has been reported to transmit viruses that cause cassava mosaic disease (CMD) and cassava brown streak disease (CBSD) in many parts of sub-Saharan Africa (SSA). Currently, there is limited information on the distribution, species and haplotype composition of the whitefly populations colonizing cassava in Kenya. A study was conducted in the major cassava growing regions of Kenya to address this gap. Analyses of mitochondrial DNA cytochrome oxidase 1 (mtCO1) sequences revealed the presence of four distinct whitefly species: Bemisia tabaci, Bemisia afer, Aleurodicus dispersus and Paraleyrodes bondari in Kenya. The B. tabaci haplotypes were further resolved into SSA1, SSA2 and Indian Ocean (IO) putative species. The SSA1 population had three haplogroups of SSA1-SG1, SSA-SG2 and SSA1-SG3. Application of KASP genotyping grouped the Bemisia tabaci into two haplogroups namely sub-Saharan Africa East and Southern Africa (SSA-ESA) and sub-Saharan Africa East and Central Africa (SSA-ECA). The study presents the first report of P. bondari (Bondar’s nesting whitefly) on cassava in Kenya. Bemisia tabaci was widely distributed in all the major cassava growing regions in Kenya. The increased detection of different whitefly species on cassava and genetically diverse B. tabaci mitotypes indicates a significant influence on the dynamics of cassava virus epidemics in the field. The study highlights the need for continuous monitoring of invasive whitefly species population on cassava for timely application of management practices to reduce the impact of cassava viral diseases and prevent potential yield losses.
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Xavier CAD, Nogueira AM, Bello VH, Watanabe LFM, Barbosa TMC, Alves Júnior M, Barbosa L, Beserra-Júnior JEA, Boari A, Calegario R, Gorayeb ES, Honorato Júnior J, Koch G, Lima GSDA, Lopes C, de Mello RN, Pantoja K, Silva FN, Ramos Sobrinho R, Santana EN, da Silva JWP, Krause-Sakate R, Zerbini FM. Assessing the diversity of whiteflies infesting cassava in Brazil. PeerJ 2021; 9:e11741. [PMID: 34316398 PMCID: PMC8286705 DOI: 10.7717/peerj.11741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 06/17/2021] [Indexed: 11/20/2022] Open
Abstract
Background The necessity of a competent vector for transmission is a primary ecological factor driving the host range expansion of plant arthropod-borne viruses, with vectors playing an essential role in disease emergence. Cassava begomoviruses severely constrain cassava production in Africa. Curiously, begomoviruses have never been reported in cassava in South America, the center of origin for this crop. It has been hypothesized that the absence of a competent vector in cassava is the reason why begomoviruses have not emerged in South America. Methods We performed a country-wide whitefly diversity study in cassava in Brazil. Adults and/or nymphs of whiteflies were collected from sixty-six cassava fields in the main agroecological zones of the country. A total of 1,385 individuals were genotyped based on mitochondrial cytochrome oxidase I sequences. Results A high species richness was observed, with five previously described species and two putative new ones. The prevalent species were Tetraleurodes acaciae and Bemisia tuberculata, representing over 75% of the analyzed individuals. Although we detected, for the first time, the presence of Bemisia tabaci Middle East-Asia Minor 1 (BtMEAM1) colonizing cassava in Brazil, it was not prevalent. The species composition varied across regions, with fields in the Northeast region showing a higher diversity. These results expand our knowledge of whitefly diversity in cassava and support the hypothesis that begomovirus epidemics have not occurred in cassava in Brazil due to the absence of competent vector populations. However, they indicate an ongoing adaptation process of BtMEAM1 to cassava, increasing the likelihood of begomovirus emergence in this crop.
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Affiliation(s)
- Cesar A D Xavier
- Dep. de Fitopatologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | | | | | | | | | - Miguel Alves Júnior
- Faculdade de Engenharia Agronômica, Universidade Federal do Pará, Altamira, PA, Brazil
| | - Leonardo Barbosa
- Instituto Federal do Sudeste de Minas Gerais, Rio Pomba, MG, Brazil
| | | | | | - Renata Calegario
- Dep. de Fitotecnia e Fitossanidade, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Eduardo Silva Gorayeb
- Centro de Ciências Agroveterinárias, Universidade do Estado de Santa Catarina, Lages, SC, Brazil
| | - Jaime Honorato Júnior
- Centro Multidisciplinar do Campus de Barra, Universidade Federal do Oeste da Bahia, Barra, BA, Brazil
| | - Gabriel Koch
- Dep. de Fitotecnia e Fitossanidade, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | | | - Cristian Lopes
- Instituto Federal do Sudeste de Minas Gerais, Rio Pomba, MG, Brazil
| | | | | | - Fábio Nascimento Silva
- Centro de Ciências Agroveterinárias, Universidade do Estado de Santa Catarina, Lages, SC, Brazil
| | - Roberto Ramos Sobrinho
- Centro de Ciências Agrárias/Fitossanidade, Universidade Federal de Alagoas, Rio Largo, AL, Brazil
| | | | | | | | - Francisco M Zerbini
- Dep. de Fitopatologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG, Brazil
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10
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Chiza Chikoti P, Tembo M, Peter Legg J, Rufini Shirima R, Mugerwa H, Sseruwagi P. Genetic Diversity of Mitochondrial DNA of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) Associated with Cassava and the Occurrence of Cassava Mosaic Disease in Zambia. INSECTS 2020; 11:E761. [PMID: 33167394 PMCID: PMC7694332 DOI: 10.3390/insects11110761] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 11/30/2022]
Abstract
Bemisia tabaci is an important vector of cassava brown streak viruses and cassava mosaic begomoviruses, the causal agents of cassava brown streak disease and cassava mosaic disease (CMD), respectively. A study was carried out to determine the genetic variability of B. tabaci associated with cassava and the occurrence of CMD in Zambia in 2013 and 2015. Phylogenetic analysis showed the presence of only the sub-Saharan Africa 1 (SSA1) genetic group in Zambia. The SSA1 population had three population subgroups (SGs): SSA1-SG1, SSA1-SG2 and SSA1-SG3. All three SSA1 population subgroups occurred in Western Province. However, only SSA1-SG3 occurred in Eastern Province, while only SSA1-SG1 occurred in North Western and Luapula Provinces. Adult B. tabaci were most abundant in Western Province in 2013 (11.1/plant) and 2015 (10.8/plant), and least abundant (0.2/plant) in Northern Province in both 2013 and 2015. CMD was prevalent in all seven provinces surveyed, with the highest incidence recorded in Lusaka Province in both 2013 (78%) and 2015 (83.6%), and the lowest in Northern Province in both 2013 (26.6%) and 2015 (29.3%). Although SSA1-SG1 occurred at greater abundances than the other subgroups, there was no direct association demonstrated between whitefly subgroup and incidence of CMD. Establishing which B. tabaci genetic groups and populations are associated with CMD and their distribution in the country is a key factor in guiding the development of CMD control strategies for cassava-dependent households.
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Affiliation(s)
- Patrick Chiza Chikoti
- Zambia Agriculture Research Institute, Mt. Makulu Research Station, Private Bag 7, Chilanga 10101, Zambia;
| | - Mathias Tembo
- Zambia Agriculture Research Institute, Mt. Makulu Research Station, Private Bag 7, Chilanga 10101, Zambia;
| | - James Peter Legg
- International Institute of Tropical Agriculture, P.O. Box 34441 Dar es Salaam, Tanzania; (J.P.L.); (R.R.S.)
| | - Rudolph Rufini Shirima
- International Institute of Tropical Agriculture, P.O. Box 34441 Dar es Salaam, Tanzania; (J.P.L.); (R.R.S.)
| | - Habibu Mugerwa
- Department of Entomology, University of Georgia, 1109 Experiment Street, Griffin, GA 30223, USA;
| | - Peter Sseruwagi
- Mikocheni Agricultural Research Institute, P.O. Box 6226 Dar es Salaam, Tanzania;
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11
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Nwezeobi J, Onyegbule O, Nkere C, Onyeka J, van Brunschot S, Seal S, Colvin J. Cassava whitefly species in eastern Nigeria and the threat of vector-borne pandemics from East and Central Africa. PLoS One 2020; 15:e0232616. [PMID: 32379806 PMCID: PMC7205266 DOI: 10.1371/journal.pone.0232616] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 04/18/2020] [Indexed: 12/02/2022] Open
Abstract
Bemisia tabaci (sensu latu) is a group of >40 highly cryptic whitefly species that are of global agricultural importance, both as crop pests and plant-virus vectors. Two devastating cassava diseases in East and Central Africa are spread by abundant populations of one of these species termed Sub-Saharan Africa 1 (SSA1). There is a substantive risk that these whitefly-borne pandemics will continue to spread westwards and disrupt cassava production for millions of smallholder farmers in West Africa. We report here, therefore, the first comprehensive survey of cassava B. tabaci in eastern Nigeria, a West African region likely to be the first affected by the arrival of these whitefly-borne pandemics. We found one haplotype comprising 32 individuals with 100% identical mtCO1 sequence to the East African SSA1 populations (previously termed SSA1-SG1) and 19 mtCO1 haplotypes of Sub-Saharan Africa 3 (SSA3), the latter being the most prevalent and widely distributed B. tabaci species in eastern Nigeria. A more divergent SSA1 mtCO1 sequence (previously termed SSA1-SG5) was also identified in the region, as were mtCO1 sequences identifying the presence of the MED ASL B. tabaci species and Bemisia afer. Although B. tabaci SSA1 was found in eastern Nigeria, they were not present in the high abundances associated with the cassava mosaic (CMD) and cassava brown streak disease (CBSD) pandemics of East and Central Africa. Also, no severe CMD or any CBSD symptoms were found in the region.
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Affiliation(s)
- Joachim Nwezeobi
- Natural Resources Institute, University of Greenwich, Chatham Maritime, Kent, United Kingdom
| | | | | | - Joseph Onyeka
- National Root Crops Research Institute, Umudike, Abia, Nigeria
| | - Sharon van Brunschot
- Natural Resources Institute, University of Greenwich, Chatham Maritime, Kent, United Kingdom
- School of Biological Sciences, The University of Queensland, St. Lucia, Queensland, Australia
| | - Susan Seal
- Natural Resources Institute, University of Greenwich, Chatham Maritime, Kent, United Kingdom
| | - John Colvin
- Natural Resources Institute, University of Greenwich, Chatham Maritime, Kent, United Kingdom
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12
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Taquet A, Delatte H, Barrès B, Simiand C, Grondin M, Jourdan-Pineau H. Insecticide resistance and fitness cost in Bemisia tabaci (Hemiptera: Aleyrodidae) invasive and resident species in La Réunion Island. PEST MANAGEMENT SCIENCE 2020; 76:1235-1244. [PMID: 31583807 DOI: 10.1002/ps.5633] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 09/10/2019] [Accepted: 09/27/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Global and intensive use of insecticides has led to the emergence and rapid evolution of resistance in the major pest Bemisia tabaci (Gennadius). In La Réunion, an island of the South West Indian Ocean, three whitefly species coexist, two of which are predominant, the indigenous Indian Ocean (IO) and the invasive Middle East Asia Minor 1 (MEAM1) species. To assess the resistance level of both of these species to acetamiprid and pymetrozine, whitefly populations were sampled at 15 collection sites located all over the island in agroecosystems and natural areas, and tested using leaf-dip bioassays. We also investigated the potential cost of resistance to acetamiprid by measuring six fitness-related traits for MEAM1 populations that displayed different resistance levels. RESULTS IO was mainly found in natural areas and was susceptible to both acetamiprid and pymetrozine. MEAM1 populations displayed evidence of high resistance to pymetrozine, whereas resistance to acetamiprid was more variable. No fitness-related costs were associated with this resistance in MEAM1 populations. CONCLUSION This is the first assessment of the susceptibility to insecticides for B. tabaci IO species. For the time being, no resistance to the tested insecticides has evolved in this species despite (i) its presence in agroecosystems and their surroundings, and (ii) its close proximity to, and possible hybridization with, the MEAM1 species. In contrast, with continuous selection pressure of insecticide treatments and in the absence of fitness cost to resistance, the invasive exotic species MEAM1 will continue to threaten agriculture in La Réunion. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Alizée Taquet
- CIRAD, UMR PVBMT, Pôle de Protection des Plantes, Saint-Pierre, France
| | - Hélène Delatte
- CIRAD, UMR PVBMT, Pôle de Protection des Plantes, Saint-Pierre, France
| | - Benoit Barrès
- Université de Lyon, Anses, INRA, USC CASPER, Lyon, France
| | | | - Martial Grondin
- CIRAD, UMR PVBMT, Pôle de Protection des Plantes, Saint-Pierre, France
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13
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Misaka BC, Wosula EN, Marchelo-d’Ragga PW, Hvoslef-Eide T, Legg JP. Genetic Diversity of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) Colonizing Sweet Potato and Cassava in South Sudan. INSECTS 2020; 11:insects11010058. [PMID: 31963536 PMCID: PMC7022610 DOI: 10.3390/insects11010058] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 01/09/2020] [Accepted: 01/10/2020] [Indexed: 01/13/2023]
Abstract
Bemisia tabaci (Gennadius) is a polyphagous, highly destructive pest that is capable of vectoring viruses in most agricultural crops. Currently, information regarding the distribution and genetic diversity of B. tabaci in South Sudan is not available. The objectives of this study were to investigate the genetic variability of B. tabaci infesting sweet potato and cassava in South Sudan. Field surveys were conducted between August 2017 and July and August 2018 in 10 locations in Juba County, Central Equatoria State, South Sudan. The sequences of mitochondrial DNA cytochrome oxidase I (mtCOI) were used to determine the phylogenetic relationships between sampled B. tabaci. Six distinct genetic groups of B. tabaci were identified, including three non-cassava haplotypes (Mediterranean (MED), Indian Ocean (IO), and Uganda) and three cassava haplotypes (Sub-Saharan Africa 1 sub-group 1 (SSA1-SG1), SSA1-SG3, and SSA2). MED predominated on sweet potato and SSA2 on cassava in all of the sampled locations. The Uganda haplotype was also widespread, occurring in five of the sampled locations. This study provides important information on the diversity of B. tabaci species in South Sudan. A comprehensive assessment of the genetic diversity, geographical distribution, population dynamics, and host range of B. tabaci species in South Sudan is vital for its effective management.
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Affiliation(s)
- Beatrice C. Misaka
- Department of Agricultural Science, School of Natural Resources and Environmental Sciences, University of Juba, P.O. Box 82, Juba, South Sudan; (B.C.M.); (P.W.M.-d.)
- Department of Plant Sciences, Norwegian University of Life Sciences (NMBU), P.O. Box 5003, 1432 Ås, Norway
| | - Everlyne N. Wosula
- International Institute of Tropical Agriculture, P.O. Box 34441, Dar es Salaam, Tanzania; (E.N.W.); (J.P.L.)
| | - Philip W. Marchelo-d’Ragga
- Department of Agricultural Science, School of Natural Resources and Environmental Sciences, University of Juba, P.O. Box 82, Juba, South Sudan; (B.C.M.); (P.W.M.-d.)
| | - Trine Hvoslef-Eide
- Department of Plant Sciences, Norwegian University of Life Sciences (NMBU), P.O. Box 5003, 1432 Ås, Norway
- Correspondence: ; Tel.: +47-93433775
| | - James P. Legg
- International Institute of Tropical Agriculture, P.O. Box 34441, Dar es Salaam, Tanzania; (E.N.W.); (J.P.L.)
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14
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Milenovic M, Wosula EN, Rapisarda C, Legg JP. Impact of Host Plant Species and Whitefly Species on Feeding Behavior of Bemisia tabaci. FRONTIERS IN PLANT SCIENCE 2019; 10:1. [PMID: 30723482 PMCID: PMC6349738 DOI: 10.3389/fpls.2019.00001] [Citation(s) in RCA: 116] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 01/03/2019] [Indexed: 05/20/2023]
Abstract
Whiteflies of the Bemisia tabaci species complex are economically important pests of cassava. In Africa, they cause greatest damage through vectoring viruses responsible for cassava mosaic disease and cassava brown streak disease. Several cryptic species from the B. tabaci complex colonize cassava and neighboring crops, but the feeding interactions between the different crops and B. tabaci species are unknown. The electrical penetration graph (EPG) technique makes it possible to conduct detailed feeding studies of sap-sucking insects by creating an electric circuit through the insect and the plant. The apparatus measures the voltage fluctuations while the wired-up insect feeds and produces graphs that describe feeding behavior. We utilized EPG to explore the feeding behavior of cassava-colonizing whiteflies (SSA1-SG3) on cassava, sweet potato, tomato, and cotton; and sweet potato-colonizing whiteflies (MED and IO) on cassava and sweet potato. Results show that: (1) feeding of SSA1-SG3 is not restricted to cassava. The least preferred host for SSA1-SG3 was tomato, where probing was delayed by 99 min compared to 10 min on other hosts, furthermore mean duration of phloem ingestion events was 36 min compared to 260 min on cassava. (2) Feeding of MED on cassava appeared to be non-functional, as it was characterized by short total phloem ingestion periods (<1 h) and few, short ingestion events, in contrast to feeding on sweet potato which was characterized by long phloem ingestion periods (>5 h). (3) Wire diameter affects the feeding in a statistically and practically significant manner. Implications for whitefly control and studies of host whitefly resistance are discussed.
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Affiliation(s)
- Milan Milenovic
- Dipartimento di Agricoltura, Alimentazione e Ambiente, University of Catania, Catania, Italy
- Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
- International Institute of Tropical Agriculture, Dar es Salaam, Tanzania
| | | | - Carmelo Rapisarda
- Dipartimento di Agricoltura, Alimentazione e Ambiente, University of Catania, Catania, Italy
| | - James Peter Legg
- International Institute of Tropical Agriculture, Dar es Salaam, Tanzania
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15
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Wosula EN, Chen W, Fei Z, Legg JP. Unravelling the Genetic Diversity among Cassava Bemisia tabaci Whiteflies Using NextRAD Sequencing. Genome Biol Evol 2018; 9:2958-2973. [PMID: 29096025 PMCID: PMC5714214 DOI: 10.1093/gbe/evx219] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2017] [Indexed: 12/27/2022] Open
Abstract
Bemisia tabaci threatens production of cassava in Africa through vectoring viruses that cause cassava mosaic disease (CMD) and cassava brown streak disease (CBSD). B. tabaci sampled from cassava in eight countries in Africa were genotyped using NextRAD sequencing, and their phylogeny and population genetics were investigated using the resultant single nucleotide polymorphism (SNP) markers. SNP marker data and short sequences of mitochondrial DNA cytochrome oxidase I (mtCOI) obtained from the same insect were compared. Eight genetically distinct groups were identified based on mtCOI, whereas phylogenetic analysis using SNPs identified six major groups, which were further confirmed by PCA and multidimensional analyses. STRUCTURE analysis identified four ancestral B. tabaci populations that have contributed alleles to the six SNP-based groups. Significant gene flows were detected between several of the six SNP-based groups. Evidence of gene flow was strongest for SNP-based groups occurring in central Africa. Comparison of the mtCOI and SNP identities of sampled insects provided a strong indication that hybrid populations are emerging in parts of Africa recently affected by the severe CMD pandemic. This study reveals that mtCOI is not an effective marker at distinguishing cassava-colonizing B. tabaci haplogroups, and that more robust SNP-based multilocus markers should be developed. Significant gene flows between populations could lead to the emergence of haplogroups that might alter the dynamics of cassava virus spread and disease severity in Africa. Continuous monitoring of genetic compositions of whitefly populations should be an essential component in efforts to combat cassava viruses in Africa.
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Affiliation(s)
- Everlyne N Wosula
- International Institute of Tropical Agriculture, Dar es Salaam, Tanzania
| | - Wenbo Chen
- Boyce Thompson Institute, Ithaca, New York
| | - Zhangjun Fei
- Boyce Thompson Institute, Ithaca, New York.,USDA-ARS Robert W. Holley Center for Agriculture and Health, Ithaca, New York
| | - James P Legg
- International Institute of Tropical Agriculture, Dar es Salaam, Tanzania
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16
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Jacobson AL, Duffy S, Sseruwagi P. Whitefly-transmitted viruses threatening cassava production in Africa. Curr Opin Virol 2018; 33:167-176. [PMID: 30243102 DOI: 10.1016/j.coviro.2018.08.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 08/28/2018] [Accepted: 08/31/2018] [Indexed: 10/28/2022]
Abstract
Emerging plant viruses are one of the greatest problems facing crop production worldwide, and have severe consequences in the developing world where subsistence farming is a major source of food production, and knowledge and resources for management are limited. In Africa, evolution of two viral disease complexes, cassava mosaic begomoviruses (CMBs) (Geminiviridae) and cassava brown streak viruses (CBSVs) (Potyviridae), have resulted in severe pandemics that continue to spread and threaten cassava production. Identification of genetically diverse and rapidly evolving CMBs and CBSVs, extensive genetic variation in the vector, Bemisia tabaci (Hemiptera: Aleyrodidae), and numerous secondary endosymbiont profiles that influence vector phenotypes suggest that complex local and regional vector-virus-plant-environment interactions may be driving the evolution and epidemiology of these viruses.
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Affiliation(s)
- Alana Lynn Jacobson
- Department of Entomology and Plant Pathology, Auburn University, 301 Funchess Hall, Auburn, AL 36849, USA.
| | - Siobain Duffy
- Department of Ecology, Evolution, and Natural Resources, Rutgers University, 14 College Farm Rd, New Brunswick, NJ 08901, USA
| | - Peter Sseruwagi
- Mikocheni Agricultural Research Institute, P.O. Box 6226, Dar es Salaam, Tanzania
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17
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Romba R, Gnankine O, Drabo SF, Tiendrebeogo F, Henri H, Mouton L, Vavre F. Abundance of Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) and its parasitoids on vegetables and cassava plants in Burkina Faso (West Africa). Ecol Evol 2018; 8:6091-6103. [PMID: 29988460 PMCID: PMC6024141 DOI: 10.1002/ece3.4078] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 03/09/2018] [Accepted: 03/24/2018] [Indexed: 02/02/2023] Open
Abstract
The whitefly Bemisia tabaci is a pest of many agricultural and ornamental crops worldwide and particularly in Africa. It is a complex of cryptic species, which is extremely polyphagous with hundreds of host plants identified around the world. Previous surveys in western Africa indicated the presence of two biotypes of the invasive MED species (MED-Q1 and MED-Q3) living in sympatry with the African species SSA and ASL. This situation constitutes one of the rare cases of local coexistence of various genetic entities within the B. tabaci complex. In order to study the dynamics of the distribution and abundance of genetic entities within this community and to identify potential factors that could contribute to coexistence, we sampled B. tabaci populations in Burkina Faso in 2015 and 2016 on various plants, and also their parasitoids. All four genetic entities were still recorded, indicating no exclusion of local species by the MED species. While B. tabaci individuals were found on 55 plant species belonging to eighteen (18) families showing the high polyphagy of this pest, some species/biotypes exhibited higher specificity. Two parasitoid species (Eretmocerus mundus and Encarsia vandrieschei) were also recorded with E. mundus being predominant in most localities and on most plants. Our data indicated that whitefly abundance, diversity, and rate of parasitism varied according to areas, plants, and years, but that parasitism rate was globally highly correlated with whitefly abundance suggesting density dependence. Our results also suggest dynamic variation in the local diversity of B. tabaci species/biotypes from 1 year to the other, specifically with MED-Q1 and ASL species. This work provides relevant information on the nature of plant-B. tabaci-parasitoid interactions in West Africa and identifies that coexistence might be stabilized by niche differentiation for some genetic entities. However, MED-Q1 and ASL show extensive niche overlap, which could ultimately lead to competitive exclusion.
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Affiliation(s)
- Rahim Romba
- Laboratoire d'Entomologie Fondamentale et Appliquée, Unité de Formation et de Recherche en Sciences de la Vie et de la Terre (UFR‐SVT)Université Ouaga I Pr Joseph Ki ZerboOuagadougouBurkina Faso
| | - Olivier Gnankine
- Laboratoire d'Entomologie Fondamentale et Appliquée, Unité de Formation et de Recherche en Sciences de la Vie et de la Terre (UFR‐SVT)Université Ouaga I Pr Joseph Ki ZerboOuagadougouBurkina Faso
| | - Samuel Fogné Drabo
- Laboratoire d'Entomologie Fondamentale et Appliquée, Unité de Formation et de Recherche en Sciences de la Vie et de la Terre (UFR‐SVT)Université Ouaga I Pr Joseph Ki ZerboOuagadougouBurkina Faso
| | | | - Hélène Henri
- Université de LyonUniversité Lyon 1CNRSLaboratoire de Biométrie et Biologie EvolutiveUMR5558VilleurbanneFrance
| | - Laurence Mouton
- Université de LyonUniversité Lyon 1CNRSLaboratoire de Biométrie et Biologie EvolutiveUMR5558VilleurbanneFrance
| | - Fabrice Vavre
- Université de LyonUniversité Lyon 1CNRSLaboratoire de Biométrie et Biologie EvolutiveUMR5558VilleurbanneFrance
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