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Wosula EN, Shirima RR, Amour M, Woyengo VW, Otunga BM, Legg JP. Occurrence and Distribution of Major Cassava Pests and Diseases in Cultivated Cassava Varieties in Western Kenya. Viruses 2024; 16:1469. [PMID: 39339946 PMCID: PMC11437512 DOI: 10.3390/v16091469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2024] [Revised: 09/07/2024] [Accepted: 09/11/2024] [Indexed: 09/30/2024] Open
Abstract
Cassava is an important food crop in western Kenya, yet its production is challenged by pests and diseases that require routine monitoring to guide development and deployment of control strategies. Field surveys were conducted in 2022 and 2023 to determine the prevalence, incidence and severity of cassava mosaic disease (CMD) and cassava brown streak disease (CBSD), whitefly numbers and incidence of cassava green mite (CGM) in six counties of western Kenya. Details of the encountered cassava varieties were carefully recorded to determine the adoption of improved varieties. A total of 29 varieties were recorded, out of which 13 were improved, although the improved varieties were predominant in 60% of fields and the most widely grown variety was MM96/4271. The CMD incidence was higher in 2022 (26.4%) compared to 2023 (10.1%), although the proportion of CMD attributable to whitefly infection was greater (50.6%) in 2023 than in 2022 (18.0%). The CBSD incidence in 2022 was 6.4%, while in 2023 it was 4.1%. The CMD incidence was significantly lower (5.9%) for the improved varieties than it was for the local varieties (35.9%), although the CBSD incidence did not differ significantly between the improved (2.3%) and local varieties (9.7%). Cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV) were both detected. Most infections were single CBSV infections (82.9%), followed by single UCBSV (34.3%) and coinfection with both viruses (16.7%). Whiteflies were more abundant in 2023, in which 28% of the fields had super-abundant populations of >100/plant, compared to 5% in 2022. KASP SNP genotyping designated 92.8% of the specimens as SSA-ECA for 2022, while it was 94.4% for 2023. The cassava green mite incidence was 65.4% in 2022 compared to 79.9% in 2023. This study demonstrates that cassava viruses, whiteflies and cassava green mites continue to be important constraints to cassava production in western Kenya, although the widespread cultivation of improved varieties is reducing the impact of cassava viruses. The more widespread application of high-quality seed delivery mechanisms could further enhance the management of these pests/diseases, coupled with wider application of IPM measures for whiteflies and mites.
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Affiliation(s)
- Everlyne N Wosula
- International Institute of Tropical Agriculture (IITA-Tanzania), Dar es Salaam P.O. BOX 34441, Tanzania
| | - Rudolph R Shirima
- International Institute of Tropical Agriculture (IITA-Tanzania), Dar es Salaam P.O. BOX 34441, Tanzania
| | - Massoud Amour
- International Institute of Tropical Agriculture (IITA-Tanzania), Dar es Salaam P.O. BOX 34441, Tanzania
| | - Vincent W Woyengo
- Kenya Agricultural Livestock Research Organization (KALRO), Kakamega P.O. Box 57811, Kenya
| | - Bonface M Otunga
- Kenya Agricultural Livestock Research Organization (KALRO), Kakamega P.O. Box 57811, Kenya
| | - James P Legg
- International Institute of Tropical Agriculture (IITA-Tanzania), Dar es Salaam P.O. BOX 34441, Tanzania
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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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Naveed H, Islam W, Jafir M, Andoh V, Chen L, Chen K. A Review of Interactions between Plants and Whitefly-Transmitted Begomoviruses. PLANTS (BASEL, SWITZERLAND) 2023; 12:3677. [PMID: 37960034 PMCID: PMC10648457 DOI: 10.3390/plants12213677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 10/22/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023]
Abstract
The transmission of plant viruses from infected to healthy host plants is a process in which insects play a major role, using various transmission strategies. Environmental factors have an impact on the transmission of viruses and the subsequent development of infections or diseases. When viruses are successful, plant virus diseases can reach epidemic proportions. Many plants across different regions are vulnerable to viral infections transmitted by the whitefly vector. Begomoviruses, which are transmitted by whiteflies, represent a significant threat to agriculture worldwide. The review highlights the mechanisms of virus acquisition and transmission by whiteflies and explores the factors influencing these interactions. Understanding the impacts of these changes is crucial for managing the spread of pests and mitigating damage to crops. It underscores the need for continued research to elucidate the mechanisms driving plant-insect-virus interactions and to identify new approaches for sustainable pest management.
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Affiliation(s)
- Hassan Naveed
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China;
- School of Life Sciences, Jiangsu University, Zhenjiang 212013, China;
| | - Waqar Islam
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
| | - Muhammad Jafir
- Department of Ecology, School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China;
| | - Vivian Andoh
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China;
- School of Life Sciences, Jiangsu University, Zhenjiang 212013, China;
| | - Liang Chen
- School of Life Sciences, Jiangsu University, Zhenjiang 212013, China;
| | - Keping Chen
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China;
- School of Life Sciences, Jiangsu University, Zhenjiang 212013, China;
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Shakoor S, Rao AQ, Ajmal S, Yasmeen A, Khan MAU, Sadaqat S, Ashraf NM, Wolter F, Pacher M, Husnain T. Multiplex Cas9-based excision of CLCuV betasatellite and DNA-A revealed reduction of viral load with asymptomatic cotton plants. PLANTA 2023; 258:79. [PMID: 37698688 DOI: 10.1007/s00425-023-04233-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Accepted: 08/27/2023] [Indexed: 09/13/2023]
Abstract
MAIN CONCLUSION Multiplexed Cas9-based genome editing of cotton resulted in reduction of viral load with asymptomatic cotton plants. In depth imaging of proteomic dynamics of resulting CLCuV betasatellite and DNA-A protein was also performed. The notorious cotton leaf curl virus (CLCuV), which is transmitted by the sap-sucking insect whitefly, continuously damages cotton crops. Although the application of various toxins and RNAi has shown some promise, sustained control has not been achieved. Consequently, CRISPR_Cas9 was applied by designing multiplex targets against DNA-A (AC2 and AC3) and betasatellite (βC1) of CLCuV using CRISPR direct and ligating into the destination vector of the plant using gateway ligation method. The successful ligation of targets into the destination vector was confirmed by the amplification of 1049 bp using a primer created from the promoter and target, while restriction digestion using the AflII and Asc1 enzymes determined how compact the plasmid developed and the nucleotide specificity of the plasmid was achieved through Sanger sequencing. PCR confirmed the successful introduction of plasmid into CKC-1 cotton variety. Through Sanger sequencing and correlation with the mRNA expression of DNA-A and betasatellite in genome-edited cotton plants subjected to agroinfiltration of CLCuV infectious clone, the effectiveness of knockout was established. The genome-edited cotton plants demonstrated edited efficacy of 72% for AC2 and AC3 and 90% for the (βC1) through amplicon sequencing, Molecular dynamics (MD) simulations were used to further validate the results. Higher RMSD values for the edited βC1 and AC3 proteins indicated functional loss caused by denaturation. Thus, CRISPR_Cas9 constructs can be rationally designed using high-throughput MD simulation technique. The confidence in using this technology to control plant virus and its vector was determined by the knockout efficiency and the virus inoculation assay.
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Affiliation(s)
- Sana Shakoor
- Centre of Excellence in Molecular Biology, University of the Punjab, 87-West Canal Bank Road, Lahore, 53700, Pakistan
| | - Abdul Qayyum Rao
- Centre of Excellence in Molecular Biology, University of the Punjab, 87-West Canal Bank Road, Lahore, 53700, Pakistan.
| | - Sara Ajmal
- Centre of Excellence in Molecular Biology, University of the Punjab, 87-West Canal Bank Road, Lahore, 53700, Pakistan
| | - Aneela Yasmeen
- Centre of Excellence in Molecular Biology, University of the Punjab, 87-West Canal Bank Road, Lahore, 53700, Pakistan
| | | | - Sahar Sadaqat
- Centre of Excellence in Molecular Biology, University of the Punjab, 87-West Canal Bank Road, Lahore, 53700, Pakistan
| | - Naeem Mahmood Ashraf
- School of Biochemistry and Biotechnology, University of the Punjab, Lahore, Pakistan
| | - Felix Wolter
- Pacific Biosciences, Bonn, Nordrhein-Westfalen, Deutschland
| | - Michael Pacher
- CureVac Manufacturing GmbH, Tübingen, Baden-Württemberg, Deutschland
| | - Tayyab Husnain
- Centre of Excellence in Molecular Biology, University of the Punjab, 87-West Canal Bank Road, Lahore, 53700, Pakistan
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Oberemok VV, Gal'chinsky NV, Useinov RZ, Novikov IA, Puzanova YV, Filatov RI, Kouakou NJ, Kouame KF, Kra KD, Laikova KV. Four Most Pathogenic Superfamilies of Insect Pests of Suborder Sternorrhyncha: Invisible Superplunderers of Plant Vitality. INSECTS 2023; 14:insects14050462. [PMID: 37233090 DOI: 10.3390/insects14050462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/10/2023] [Accepted: 05/11/2023] [Indexed: 05/27/2023]
Abstract
Sternorrhyncha representatives are serious pests of agriculture and forestry all over the world, primarily causing damage to woody plants. Sternorrhyncha members are vectors for the transfer of a large number of viral diseases, and subsequently, the host plant weakens. Additionally, many are inherent in the release of honeydew, on which fungal diseases develop. Today, an innovative approach is needed to create new and effective ways to control the number of these insects based on environmentally friendly insecticides. Of particular relevance to such developments is the need to take into account the large number of organisms living together with insect pests in this group, including beneficial insects. Practically without changing their location on their host plant, they adopted to be more invisible and protected due to their small size, symbiosis with ants, the ability to camouflage with a leaf, and moderately deplete plants and others, rarely leading them to death but still causing substantial economic loss in the subtropics and tropics. Due to the lack of presence in the literature, this review fills in this pesky spot by examining (on the example of distinct species from four superfamilies) the characteristic adaptations for this suborder and the chemical methods of combating these insects that allow them to survive in various environmental conditions, suggesting new and highly promising ways of using olinscides for plant protection against Sternorrhyncha members.
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Affiliation(s)
- Volodymyr V Oberemok
- Department of Molecular Genetics and Biotechnologies, Institute of Biochemical Technologies, Ecology and Pharmacy, V.I. Vernadsky Crimean Federal University, 295007 Simferopol, Crimea
- Nikita Botanical Gardens-National Scientific Centre, Russian Academy of Sciences, 298648 Yalta, Crimea
| | - Nikita V Gal'chinsky
- Department of Molecular Genetics and Biotechnologies, Institute of Biochemical Technologies, Ecology and Pharmacy, V.I. Vernadsky Crimean Federal University, 295007 Simferopol, Crimea
| | - Refat Z Useinov
- Department of Molecular Genetics and Biotechnologies, Institute of Biochemical Technologies, Ecology and Pharmacy, V.I. Vernadsky Crimean Federal University, 295007 Simferopol, Crimea
| | - Ilya A Novikov
- Department of Molecular Genetics and Biotechnologies, Institute of Biochemical Technologies, Ecology and Pharmacy, V.I. Vernadsky Crimean Federal University, 295007 Simferopol, Crimea
| | - Yelizaveta V Puzanova
- Department of Molecular Genetics and Biotechnologies, Institute of Biochemical Technologies, Ecology and Pharmacy, V.I. Vernadsky Crimean Federal University, 295007 Simferopol, Crimea
| | - Roman I Filatov
- Department of Molecular Genetics and Biotechnologies, Institute of Biochemical Technologies, Ecology and Pharmacy, V.I. Vernadsky Crimean Federal University, 295007 Simferopol, Crimea
| | - Nanan J Kouakou
- Centre National de Floristique, Université Félix Houphouët-Boigny, Abidjan 01 BP V 34, Côte d'Ivoire
| | - Kra F Kouame
- Centre National de Floristique, Université Félix Houphouët-Boigny, Abidjan 01 BP V 34, Côte d'Ivoire
| | - Kouadio D Kra
- Biology Laboratory and Animal Cytology, Université Nangui Abrogoua, Abidjan 02 BP 801, Côte d'Ivoire
| | - Kateryna V Laikova
- Department of Molecular Genetics and Biotechnologies, Institute of Biochemical Technologies, Ecology and Pharmacy, V.I. Vernadsky Crimean Federal University, 295007 Simferopol, Crimea
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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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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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10
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Mulema J, Day R, Nunda W, Akutse KS, Bruce AY, Gachamba S, Haukeland S, Kahuthia-Gathu R, Kibet S, Koech A, Kosiom T, Miano DW, Momanyi G, Murungi LK, Muthomi JW, Mwangi J, Mwangi M, Mwendo N, Nderitu JH, Nyasani J, Otipa M, Wambugu S, Were E, Makale F, Doughty L, Edgington S, Rwomushana I, Kenis M. Prioritization of invasive alien species with the potential to threaten agriculture and biodiversity in Kenya through horizon scanning. Biol Invasions 2022. [DOI: 10.1007/s10530-022-02824-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
AbstractInvasive alien species (IAS) rank among the most significant drivers of species extinction and ecosystem degradation resulting in significant impacts on socio-economic development. The recent exponential spread of IAS in most of Africa is attributed to poor border biosecurity due to porous borders that have failed to prevent initial introductions. In addition, countries lack adequate information about potential invasions and have limited capacity to reduce the risk of invasions. Horizon scanning is an approach that prioritises the risks of potential IAS through rapid assessments. A group of 28 subject matter experts used an adapted methodology to assess 1700 potential IAS on a 5-point scale for the likelihood of entry and establishment, potential socio-economic impact, and impact on biodiversity. The individual scores were combined to rank the species according to their overall potential risk for the country. Confidence in individual and overall scores was recorded on a 3-point scale. This resulted in a priority list of 120 potential IAS (70 arthropods, 9 nematodes, 15 bacteria, 19 fungi/chromist, 1 viroid, and 6 viruses). Options for risk mitigation such as full pest risk analysis and detection surveys were suggested for prioritised species while species for which no immediate action was suggested, were added to the plant health risk register and a recommendation was made to regularly monitor the change in risk. By prioritising risks, horizon scanning guides resource allocation to interventions that are most likely to reduce risk and is very useful to National Plant Protection Organisations and other relevant stakeholders.
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11
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Donnelly R, Gilligan CA. The role of pathogen-mediated insect superabundance in the East African emergence of a plant virus. THE JOURNAL OF ECOLOGY 2022; 110:1113-1124. [PMID: 35910423 PMCID: PMC9310957 DOI: 10.1111/1365-2745.13854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 01/22/2022] [Indexed: 06/15/2023]
Abstract
One of the major crops for food security is cassava. Superabundant Bemisia tabaci whitefly, comprising unusually high landscape populations of the insect, have been implicated in cassava virus emergence. Studies have been unable to select from several hypotheses, however, as to the dynamic drivers of superabundant whitefly associated with the emergence in East Africa of severe cassava mosaic disease. One possibility is that pathogenic modification of infected plants can itself increase the growth of insect vector colonies on infected plants.Through the modelling of population processes at the landscape scale we introduce a framework for analysing patterns in the association of disease and insect waves.Our analyses demonstrate the role of pathogen-mediated insect superabundance in a plant disease invasion. Synthesis. An elevated abundance of insects at the landscape scale is frequently implicated in invasions of the plant pathogens that they carry. We advance ecological understanding of plant disease invasions by showing how landscape data can be used to investigate the causes of insect vector superabundance.
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Affiliation(s)
- Ruairí Donnelly
- Department of Plant SciencesUniversity of CambridgeCambridgeUK
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12
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Shan HW, Liu SS. The Costs and Benefits of Two Secondary Symbionts in a Whitefly Host Shape Their Differential Prevalence in the Field. Front Microbiol 2021; 12:739521. [PMID: 34659172 PMCID: PMC8515054 DOI: 10.3389/fmicb.2021.739521] [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: 07/11/2021] [Accepted: 08/31/2021] [Indexed: 11/30/2022] Open
Abstract
Insects commonly harbor maternally inherited intracellular symbionts in nature, and the microbial partners often exert influence on host reproduction and fitness to promote their prevalence. Here, we investigated composition of symbionts and their biological effects in the invasive Bemisia tabaci MED species of a whitefly complex. Our field surveys revealed that populations of the MED whitefly, in addition to the primary symbiont Portiera, mainly contain two secondary symbionts Hamiltonella, which is nearly fixed in the host populations, and Cardinium with infection frequencies ranging from 0 to 86%. We isolated and established Cardinium-positive and Cardinium-free whitefly lines with a similar nuclear genetic background from a field population, and compared performance of the two whitefly lines. The infection of Cardinium incurred significant fitness costs on the MED whitefly, including reduction of fecundity and egg viability as well as delay in development. We then selectively removed Hamiltonella from the Cardinium-free whitefly line and compared performance of two whitefly lines, one harboring both Portiera and Hamiltonella and the other harboring only Portiera. While depletion of Hamiltonella had little or only marginal effects on the fecundity, developmental rate, and offspring survival, the Hamiltonella-free whitefly line produced very few female offspring, often reducing the progeny female ratio from about 50% to less than 1%. Our findings indicate that the varying costs and benefits of the association between these two symbionts and the MED whitefly may play an important role in shaping their differential prevalence in the field.
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Affiliation(s)
- Hong-Wei Shan
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, China.,Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Shu-Sheng Liu
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
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13
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Mugerwa H, Sseruwagi P, Colvin J, Seal S. Is High Whitefly Abundance on Cassava in Sub-Saharan Africa Driven by Biological Traits of a Specific, Cryptic Bemisia tabaci Species? INSECTS 2021; 12:260. [PMID: 33804645 PMCID: PMC8003695 DOI: 10.3390/insects12030260] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 03/06/2021] [Accepted: 03/17/2021] [Indexed: 11/17/2022]
Abstract
In East Africa, the prevalent Bemisia tabaci whiteflies on the food security crop cassava are classified as sub-Saharan Africa (SSA) species. Economically damaging cassava whitefly populations were associated with the SSA2 species in the 1990s, but more recently, it has been to SSA1 species. To investigate whether biological traits (number of first instar nymphs, emerged adults, proportion of females in progeny and development time) of the cassava whitefly species are significant drivers of the observed field abundance, our study determined the development of SSA1 sub-group (SG) 1 (5 populations), SG2 (5 populations), SG3 (1 population) and SSA2 (1 population) on cassava and eggplant under laboratory conditions. SSA1-(SG1-SG2) and SSA2 populations' development traits were similar. Regardless of the host plant, SSA1-SG2 populations had the highest number of first instar nymphs (60.6 ± 3.4) and emerged adults (50.9 ± 3.6), followed by SSA1-SG1 (55.5 ± 3.2 and 44.6 ± 3.3), SSA2 (45.8 ± 5.7 and 32.6 ± 5.1) and the lowest were SSA1-SG3 (34.2 ± 6.1 and 32.0 ± 7.1) populations. SSA1-SG3 population had the shortest egg-adult emergence development time (26.7 days), followed by SSA1-SG1 (29.1 days), SSA1-SG2 (29.6 days) and SSA2 (32.2 days). Regardless of the whitefly population, development time was significantly shorter on eggplant (25.1 ± 0.9 days) than cassava (34.6 ± 1.0 days). These results support that SSA1-(SG1-SG2) and SSA2 B. tabaci can become highly abundant on cassava, with their species classification alone not correlating with observed abundance and prevalence.
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Affiliation(s)
- Habibu Mugerwa
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK;
- Department of Entomology, University of Georgia, 1109 Experiment Street, Griffin, GA 30223, USA
| | - Peter Sseruwagi
- Biotechnology Department, Mikocheni Agricultural Research Institute, P.O. Box 6226 Dar es Salaam, Tanzania;
| | - John Colvin
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK;
| | - Susan Seal
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK;
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14
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Mugerwa H, Colvin J, Alicai T, Omongo CA, Kabaalu R, Visendi P, Sseruwagi P, Seal SE. Genetic diversity of whitefly ( Bemisia spp.) on crop and uncultivated plants in Uganda: implications for the control of this devastating pest species complex in Africa. JOURNAL OF PEST SCIENCE 2021; 94:1307-1330. [PMID: 34720787 PMCID: PMC8550740 DOI: 10.1007/s10340-021-01355-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 02/09/2021] [Accepted: 02/18/2021] [Indexed: 05/12/2023]
Abstract
UNLABELLED Over the past three decades, highly increased whitefly (Bemisia tabaci) populations have been observed on the staple food crop cassava in eastern Africa and associated with ensuing viral disease pandemics and food insecurity. Increased whitefly numbers have also been observed in other key agricultural crops and weeds. Factors behind the population surges on different crops and their interrelationships are unclear, although in cassava they have been associated with specific populations within the Bemisia tabaci species complex known to infest cassava crops in Africa. This study carried out an in-depth survey to understand the distribution of B. tabaci populations infesting crops and uncultivated plant hosts in Uganda, a centre of origin for this pest complex. Whitefly samples were collected from 59 identified plant species and 25 unidentified weeds in a countrywide survey. Identities of 870 individual adult whiteflies were determined through mitochondrial cytochrome oxidase 1 sequences (651 bp) in the 3' barcode region used for B. tabaci systematics. Sixteen B. tabaci and five related whitefly putative species were identified based on > 4.0% nucleotide divergence, of which three are proposed as novel B. tabaci putative species and four as novel closely related whitefly species. The most prevalent whiteflies were classified as B. tabaci MED-ASL (30.5% of samples), sub-Saharan Africa 1 (SSA1, 22.7%) and Bemisia Uganda1 (12.1%). These species were also indicated to be the most polyphagous occurring on 33, 40 and 25 identified plant species, respectively. Multiple (≥ 3) whitefly species occurred on specific crops (bean, eggplant, pumpkin and tomato) and weeds (Sida acuta and Ocimum gratissimum). These plants may have increased potential to act as reservoirs for mixed infections of whitefly-vectored viruses. Management of whitefly pest populations in eastern Africa will require an integration of approaches that consider their degree of polyphagy and a climate that enables the continuous presence of crop and uncultivated plant hosts. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s10340-021-01355-6.
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Affiliation(s)
- Habibu Mugerwa
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, ME4 4TB UK
- Department of Entomology, University of Georgia, 1109 Experiment Street, Griffin, GA 30223 USA
| | - John Colvin
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, ME4 4TB UK
| | - Titus Alicai
- Root Crops Programme, National Crops Resources Research Institute, P. O. Box 7084, Kampala, Uganda
| | - Christopher A. Omongo
- Root Crops Programme, National Crops Resources Research Institute, P. O. Box 7084, Kampala, Uganda
| | - Richard Kabaalu
- Root Crops Programme, National Crops Resources Research Institute, P. O. Box 7084, Kampala, Uganda
| | - Paul Visendi
- Centre for Agriculture and Bioeconomy, Queensland University of Technology, Brisbane, 4001 Australia
| | - Peter Sseruwagi
- Biotechnology Department, Mikocheni Agricultural Research Institute, P.O. Box 6226, Dar es Salaam, Tanzania
| | - Susan E. Seal
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, ME4 4TB UK
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15
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Shah R, Al-Sadi AM, Nasser Al-Sabahi J, Al-Raeesi AA, Khamis Said Al-Rawahi K, Saud Al-Rashdi A, Fadhil Madad Al-Hinai S, Velazhahan R. Efficacy of an Omani strain of Cordyceps javanica and its culture filtrate against whitefly ( Bemisia tabaci) under laboratory conditions. ALL LIFE 2020. [DOI: 10.1080/26895293.2020.1835742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- Riaz Shah
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Sultanate of Oman
| | - Abdullah Mohammed Al-Sadi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Sultanate of Oman
| | - Jamal Nasser Al-Sabahi
- Central Instrument Laboratory, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Sultanate of Oman
| | - Ali Ahmed Al-Raeesi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Sultanate of Oman
| | - Khalid Khamis Said Al-Rawahi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Sultanate of Oman
| | - Ahad Saud Al-Rashdi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Sultanate of Oman
| | - Sahar Fadhil Madad Al-Hinai
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Sultanate of Oman
| | - Rethinasamy Velazhahan
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Sultanate of Oman
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