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Mwando NL, Khamis FM, Ndlela S, Meyhöfer R, Ombura FLO, Wamalwa M, Subramanian S, Mohamed SA. Comparative transcriptome analysis of false codling moth, Thaumatotibia leucotreta in response to high and low-temperature treatments. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. PART D, GENOMICS & PROTEOMICS 2024; 50:101199. [PMID: 38330807 DOI: 10.1016/j.cbd.2024.101199] [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: 11/30/2023] [Revised: 01/07/2024] [Accepted: 01/27/2024] [Indexed: 02/10/2024]
Abstract
The false codling moth (FCM), Thaumatotibia leucotreta, is a major quarantine pest native to Africa. Physical postharvest phytosanitary measures such as cold and heat treatments are championed to control its spread to new regions. However, the molecular changes that T. leucotreta undergoes as it attempts to adjust to its surroundings during the treatments and withstand the extreme temperatures remain largely unknown. The current study employs RNA-seq using the next-generation Illumina HiSeq platform to produce transcriptome profiles for differential gene expression analysis of T. leucotreta larvae under thermal stress. The transcriptome assembly analysis revealed 226,067 transcripts, clustering into 127,018 unigenes. In comparison to the 25 °C treated group, 874, 91, 159, and 754 individual differentially expressed genes (DEGs) co-regulated at -10, 0, 40, and 50 °C, respectively were discovered. Annotation of the DEGs by gene ontology (GO) revealed several genes, previously implicated in low and high-temperature stresses, including heat shock proteins, cytochrome P450, cuticle proteins, odorant binding proteins, and immune system genes. Kyoto Encyclopedia of Genes and Genomics (KEGG) classification analysis revealed that substantive DEGs were those involved in metabolic pathways such as thiamine, purine, folate, and glycerolipid metabolism pathways. The RT-qPCR validation of several significantly up- and down-regulated DEGs showed congruence between RNA-seq and qPCR data. This baseline study lays a foundation for future research into the molecular mechanisms underlying T. leucotreta's cold/heat tolerance by providing a thorough differential gene expression analysis that has identified multiple genes that may be associated with the insect's ability to withstand cold and heat.
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Affiliation(s)
- Nelson L Mwando
- International Centre of Insect Physiology and Ecology, icipe, 30772-00100, Nairobi, Kenya; Leibniz Universität Hannover, Institute of Horticultural Production Systems, Sect. Phytomedicine - Applied Entomology, Herrenhäuser Strasse 2, D-30419 Hannover, Germany.
| | - Fathiya M Khamis
- International Centre of Insect Physiology and Ecology, icipe, 30772-00100, Nairobi, Kenya
| | - Shepard Ndlela
- International Centre of Insect Physiology and Ecology, icipe, 30772-00100, Nairobi, Kenya
| | - Rainer Meyhöfer
- Leibniz Universität Hannover, Institute of Horticultural Production Systems, Sect. Phytomedicine - Applied Entomology, Herrenhäuser Strasse 2, D-30419 Hannover, Germany
| | - Fidelis L O Ombura
- International Centre of Insect Physiology and Ecology, icipe, 30772-00100, Nairobi, Kenya
| | - Mark Wamalwa
- International Centre of Insect Physiology and Ecology, icipe, 30772-00100, Nairobi, Kenya
| | - Sevgan Subramanian
- International Centre of Insect Physiology and Ecology, icipe, 30772-00100, Nairobi, Kenya
| | - Samira A Mohamed
- International Centre of Insect Physiology and Ecology, icipe, 30772-00100, Nairobi, Kenya
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Manrakhan A, Daneel JH, Serfontein L, Mauda E, Sutton GF, Hattingh V. Efficacy of an existing Ceratitis capitata (Diptera: Tephritidae) cold disinfestation treatment schedule for Ceratitis cosyra. JOURNAL OF ECONOMIC ENTOMOLOGY 2023; 116:779-789. [PMID: 37030002 DOI: 10.1093/jee/toad063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 03/10/2023] [Accepted: 03/18/2023] [Indexed: 06/14/2023]
Abstract
The efficacy of an existing cold disinfestation postharvest treatment targeting Ceratitis capitata (Wiedemann) in citrus was determined for the marula fly, Ceratitis cosyra (Walker). The cold tolerances of C. capitata and C. cosyra were first quantified in artificial diet at 3.5 °C at different exposure periods for up to 18 days. Ceratitis capitata was found to be more cold tolerant than C. cosyra. At 3.5 °C, the duration to achieve 99.9968% mortality was calculated to be 11.57 days for C. capitata and 9.10 days for C. cosyra. Under an existing C. capitata cold treatment schedule at 1 °C for 14 days, the conditions required for complete mortality of the third larval stage of C. cosyra in orange, Citrus sinensis (L.) Osbeck cv. Valencia, were then determined. No survivors of C. cosyra in oranges were recorded beyond 11 days of cold treatment at 1 °C. The efficacy of this C. capitata treatment for disinfestation of C. cosyra was thereafter confirmed in large scale trials in Valencia oranges. In the large-scale trial at the lowest mean temperature of 1.19 °C for 14 days, there were no survivors from a total of 85 490 treated C. cosyra third instars in oranges. Since C. capitata was shown to be more cold tolerant than C. cosyra and a large scale test demonstrated at least 99.9965% efficacy after 14 days at 1.19 °C, compared with the established effective C. capitata cold treatment of 14 days at 1.11 °C, cold disinfestation treatments for C. capitata should be at least equally effective against C. cosyra.
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Affiliation(s)
- Aruna Manrakhan
- Citrus Research International, PO Box 28, Mbombela 1200, South Africa
- Department of Conservation Ecology and Entomology, Faculty of AgriSciences, Stellenbosch University, Stellenbosch, South Africa
| | - John-Henry Daneel
- Citrus Research International, PO Box 28, Mbombela 1200, South Africa
| | - Leani Serfontein
- Citrus Research International, PO Box 28, Mbombela 1200, South Africa
| | - Evans Mauda
- Citrus Research International, PO Box 28, Mbombela 1200, South Africa
| | - Guy F Sutton
- Centre for Biological Control, Department of Zoology and Entomology, Rhodes University, PO Box 94, Makhanda 6140, South Africa
| | - Vaughan Hattingh
- Citrus Research International, PO Box 28, Mbombela 1200, South Africa
- Department of Horticultural Science, Stellenbosch University, Stellenbosch, South Africa
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