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ArticleCurrent microbiology2025

Biological functions of Crystal toxin proteins and their secondary metabolites in targeting rugose spiralling whitefly Aleurodicus rugioperculatus.

Suvetha Vasan, Ranjini Bhagwandas, Aiswarya Asokan, Arthi Kandhakumar, Velavan Viswakethu, Sabariswaran Kandasamy, Thirunavukkarasu Periyasamy, Rangeshwaran Rajagopal, Sivakumar Gopalswamy

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Article in Current microbiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

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2 · The registry

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3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

9 authors.

Suvetha VasanDepartment of Biotechnology, School of Life-Science, Nehru Arts and Science College (Autonomous), Bharathiar University, Coimbatore, 641105, Tamil Nadu, India.
Ranjini BhagwandasDepartment of Biotechnology, School of Life-Science, Nehru Arts and Science College (Autonomous), Bharathiar University, Coimbatore, 641105, Tamil Nadu, India.
Aiswarya AsokanDepartment of Biotechnology, School of Life-Science, Nehru Arts and Science College (Autonomous), Bharathiar University, Coimbatore, 641105, Tamil Nadu, India.
Arthi KandhakumarDepartment of Commerce, Nehru Arts and Science College (Autonomous), Bharathiar University, Coimbatore, 641105, Tamil Nadu, India.
Velavan ViswakethuDepartment of Biotechnology, Bishop Heber College (Autonomous), Bharathidasan University, Tiruchirappalli, 620017, Tamil Nadu, India. velavan.sv@gmail.com.ORCID http://orcid.org/0000-0002-9888-542X
Sabariswaran KandasamyDepartment of Biotechnology, PSGR Krishnammal College for Women, Bharathiar University, Coimbatore, 641104, Tamil Nadu, India.
Thirunavukkarasu PeriyasamyDepartment of Biotechnology, School of Life-Science, Nehru Arts and Science College (Autonomous), Bharathiar University, Coimbatore, 641105, Tamil Nadu, India.
Rangeshwaran RajagopalDivision of Germplasm Conservation and Utilisation, ICAR-National Bureau of Agricultural Insect Resources, Bengaluru, 560024, Karnataka, India.
Sivakumar GopalswamyDivision of Germplasm Conservation and Utilisation, ICAR-National Bureau of Agricultural Insect Resources, Bengaluru, 560024, Karnataka, India.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The rugose spiralling whitefly, Aleurodicus rugioperculatus is an invasive phloem-feeding pest and acts as vector for virus transmission in banana, coconut, and other economically important crops in southern India. The main aim of this research work was to evolve a novel and eco-friendly strategy to combat this serious pest. The entomopathogenic bacterium Bacillus thuringiensis produces parasporal crystal proteins, commonly known as δ-endotoxins and widely exploited as eco-friendly insecticides. This study tested two native B. thuringiensis strains namely NBAIR-TrBt18 and NBAIR-Bt25 that were confirmed to carry the Cry16A and Cry1Ab genes. The insecticidal efficacy for volatile organic compounds emitted through insect-microbes interaction as well as under natural conditions were analysed. Bioassay of purified parasporal crystals against pre-instar nymphs showed significant mortality at lower concentrations of 2.0 µg/mL (NBAIR-TrBt18) and 2.7 µg/mL (NBAIR-Bt25) at 72h. GC-MS analysis of the headspace volatiles revealed several bioactive compounds including Z-10-Tetradecen-1-ol acetate (10Z)-10-Tetradecenyl acetate), Trans-Z-α-Bisabolene epoxide, Phenylethyl alcohol, 7-Hexadecenal, (Z)-, 2-Ethyl-1-hexanol, 2-Butanone, 2-Heptanone, Benzaldehyde, Isovaleric acid, Nonanoic acid, Oleic Acid and Decanal. Twelve detected volatiles were tested for insecticidal activity against A. rugioperculatus. These compounds showed a positive correlation with observed mortality rates. Notably, Z-10-Tetradecen-1-ol acetate (10Z)-10-Tetradecenyl acetate), trans-2-Butanone, and trans-Z-α-Bisabolene were particularly exhibiting the highest mortality at 3rd day post-inoculation on 4th pre-instar nymphs. These findings confirm that (B) thuringiensis strains not only produced potent crystal toxins but also release volatile organic compounds that possessed both insecticidal and insect repellents properties at low dosages. Overall, this research provides a foundation for the development of novel eco-friendly biocontrol formulations by integrating selective metabolites with native B. thuringiensis strains to manage A. rugioperculatus for a sustainable and safe pest management option.

Indexed as

Bacillus thuringiensisBacterial ProteinsEndotoxinsHemipteraHemolysin ProteinsInsecticidesAnimalsBacillus thuringiensis ToxinsIndiaNymphPest Control, BiologicalSecondary MetabolismVolatile Organic CompoundsBacillus thuringiensis ToxinsBacterial ProteinsEndotoxinsHemolysin Proteinsinsecticidal crystal protein, Bacillus ThuringiensisInsecticidesVolatile Organic CompoundsAleurodicus rugioperculatusBacillus thuringiensisInsect bioassayInsect-microbes interactionVolatile organic compounds

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.