Genetic diversity, distribution, and structure of Bemisia tabaci whitefly species in potential invasion and hybridization regions of East Africa

Ally Hadija, El Hamss Hajar, Simiand Christophe, Maruthi M.N., Colvin John, Delatte Hélène. 2023. Genetic diversity, distribution, and structure of Bemisia tabaci whitefly species in potential invasion and hybridization regions of East Africa. PloS One, 18 (5):e0285967, 22 p.

Url - jeu de données - Entrepôt autre : https://figshare.com/articles/figure/DAPC_analysis_performed_at_K_4_on_729_individuals_of_SSA1_species_n_sub_Tanzania_sub_288_n_sub_Uganda_sub_and_441_/23196489

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Résumé : Outbreaks of whitefly, Bemisia tabaci species in East and Central Africa, have become increasingly prevalent during the previous 25 years and are responsible for driving the spread of plant-virus diseases, such as cassava mosaic disease and cassava brown steak disease. Epidemics of these diseases have expanded their ranges over the same period, spreading from Uganda into other sub-Saharan African countries. It was hypothesised that a highly abundant 'invader' population of B. tabaci was responsible for spreading these diseases from Uganda to neighbouring countries and potentially hybridising with the resident cassava B. tabaci populations. Here, we test this hypothesis by investigating the molecular identities of the highly abundant cassava B. tabaci populations from their supposed origin in Uganda, to the northern, central, eastern and coastal regions of Tanzania. Partial mitochondrial cytochrome oxidase I (mtCOI) barcoding sequences and nuclear microsatellite markers were used to analyse the population genetic diversity and structure of 2734 B. tabaci collected from both countries and in different agroecological zones. The results revealed that: (i) the putative SSA1 species is structured according to countries, so differ between them. (ii) Restricted gene flow occurred between SSA1–SG3 and both other SSA1 subgroups (SG1 and SG2), even in sympatry, demonstrating strong barriers to hybridization between those genotypes. (iii) Not only B. tabaci SSA1-(SG1 and SG2) was found in highly abundant (outbreak) numbers, but B. tabaci SSA1-SG3 and the Indian Ocean (IO) species were also recorded in high numbers in several sites in Tanzania. (iv) The SSA1-(SG1 and SG2) species was distributed in both countries, but in Tanzania, the B. tabaci IO and SSA1–SG3 species predominated. These data confirm that multiple, local Tanzanian B. tabaci species produce highly abundant populations, independent of the spread of the putative invasive B. tabaci SSA1-(SG1 and SG2) populations.

Mots-clés Agrovoc : ravageur des plantes, espèce envahissante, génétique des populations, variation génétique, distribution des populations, Bemisia tabaci, phylogéographie

Mots-clés géographiques Agrovoc : République-Unie de Tanzanie, Ouganda

Mots-clés libres : Tanzania, Uganda, Population genetics, Phylogeography, Cassava, Haplotypes, Species diversity, Invasive species

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement européennes : European Agricultural Fund for Rural Development

Agences de financement hors UE : University of Greenwich, Bill and Melinda Gates Foundation, Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Auteurs et affiliations

• Ally Hadija, TARI (TZA) - auteur correspondant
• El Hamss Hajar, University of Greenwich (GBR)
• Simiand Christophe, CIRAD-BIOS-UMR PVBMT (REU)
• Maruthi M.N., University of Greenwich (GBR)
• Colvin John, University of Greenwich (GBR)
• Delatte Hélène, CIRAD-BIOS-UMR PVBMT (REU)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/604856/)

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