Full Text Journal Articles by
Author John Colvin

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Glucosylation prevents plant defense activation in phloem-feeding insects.

Osnat Malka, Michael L A E Easson, Christian Paetz, Monika Götz, Michael Reichelt, Beate Stein, Katrin Luck, Aleksa Stanišić, Ksenia Juravel, Diego Santos-Garcia, Lilach L Mondaca, Simon Springate, John Colvin, Stephan Winter, Jonathan Gershenzon, Shai Morin, Daniel G Vassão,

The metabolic adaptations by which phloem-feeding insects counteract plant defense compounds are poorly known. Two-component plant defenses, such as glucosinolates, consist of a glucosylated protoxin that is activated by a glycoside hydrolase upon plant damage. Phloem-feeding herbivores are not generally believed to be negatively impacted by two-component defenses due to ... Read more >>

Nat Chem Biol (Nature chemical biology)
[2020, :]

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Cassava whitefly species in eastern Nigeria and the threat of vector-borne pandemics from East and Central Africa.

Joachim Nwezeobi, Onyeyirichi Onyegbule, Chukwuemeka Nkere, Joseph Onyeka, Sharon van Brunschot, Susan Seal, John Colvin,

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). ... Read more >>

PLoS One (PloS one)
[2020, 15(5):e0232616]

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Evaluation of cultural control and resistance-breeding strategies for suppression of whitefly infestation of cassava at the landscape scale: a simulation modeling approach.

Hazel Parry, Andrew Kalyebi, Felix Bianchi, Peter Sseruwagi, John Colvin, Nancy Schellhorn, Sarina Macfadyen,

BACKGROUND:The whitefly Bemisia tabaci is an important vector of virus diseases, impacting cassava production in East Africa. To date, breeding efforts in this region have focused on disease resistance. Here we use a spatially-explicit simulation model to explore how breeding strategies for whitefly resistance will influence the population dynamics of ... Read more >>

Pest Manag. Sci. (Pest management science)
[2020, 76(8):2699-2710]

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African Basil (Ocimum gratissimum) Is a Reservoir of Divergent Begomoviruses in Uganda

Happyness G Mollel, Titus Alicai, John Colvin, Elvira Fiallo-Olivé, Jesús Navas-Castillo, Joseph Ndunguru, Peter Sseruwagi,

Begomoviruses are plant viruses that cause major losses to many economically important crops. Although they are poorly understood, begomoviruses infecting wild plants may have an important role as reservoirs in the epidemiology of viral diseases. This study reports the discovery and genomic characterization of three novel bipartite begomoviruses from wild ... Read more >>

Plant Dis. (Plant disease)
[2020, 104(3):853-859]

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A newly recorded Rickettsia of the Torix group is a recent intruder and an endosymbiont in the whitefly Bemisia tabaci.

Hua-Ling Wang, Teng Lei, Xiao-Wei Wang, M N Maruthi, Dan-Tong Zhu, Stephen L Cameron, Qiong Rao, Hong-Wei Shan, John Colvin, Yin-Quan Liu, Shu-Sheng Liu,

The bacterium Rickettsia is found widely in phytophagous insects and often exerts profound effects on the phenotype and fitness of its hosts. Here, we decrypt a new, independent, phylogenetically ancient Torix Rickettsia endosymbiont found constantly in a laboratory line of an economically important insect Asia II 7, a putative species ... Read more >>

Environ Microbiol (Environmental microbiology)
[2020, 22(4):1207-1221]

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African Basil (Ocimum gratissimum) Is a Reservoir of Divergent Begomoviruses in Uganda.

Happyness G Mollel, Joseph Ndunguru, Peter Sseruwagi, Titus Alicai, John Colvin, Jesús Navas-Castillo, Elvira Fiallo-Olivé,

Begomoviruses are plant viruses that cause major losses to many economically important crops. Although they are poorly understood, begomoviruses infecting wild plants may have an important role as reservoirs in the epidemiology of viral diseases. This study reports the discovery and genomic characterization of three novel bipartite begomoviruses from wild ... Read more >>

Plant Dis. (Plant disease)
[2020, 104(3):853-859]

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What has changed in the outbreaking populations of the severe crop pest whitefly species in cassava in two decades?

Hadija M Ally, Hajar El Hamss, Christophe Simiand, M N Maruthi, John Colvin, Christopher A Omongo, Helene Delatte,

High populations of African cassava whitefly (Bemisia tabaci) have been associated with epidemics of two viral diseases in Eastern Africa. We investigated population dynamics and genetic patterns by comparing whiteflies collected on cassava in 1997, during the first whitefly upsurges in Uganda, with collections made in 2017 from the same ... Read more >>

Sci Rep (Scientific reports)
[2019, 9(1):14796]

Cited: 1 time

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A characterisation of established unilateral transfemoral amputee gait using 3D kinematics, kinetics and oxygen consumption measures.

Bruce Carse, Helen Scott, Laura Brady, John Colvin,

BACKGROUND:Persons with unilateral transfemoral (UTF) amputation are known to walk with less efficiency than able-bodied individuals, therefore understanding the gait deviations that drive this inefficiency was considered to be important. RESEARCH QUESTIONS:What are the differences in gait outcomes between persons with UTF amputation and able-bodied persons? What is the prevalence ... Read more >>

Gait Posture (Gait & posture)
[2020, 75:98-104]

Cited: 1 time

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Scotland's efforts to improve the lives of trainee doctors.

Andrew C Pearson, John R Colvin,

BMJ (BMJ (Clinical research ed.))
[2019, 366:l5060]

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Publisher Correction: Insight into the microbial world of Bemisia tabaci cryptic species complex and its relationships with its host.

Hua-Ling Wang, Teng Lei, Wen-Qiang Xia, Stephen L Cameron, Yin-Quan Liu, Zhen Zhang, Maruthi M N Gowda, Paul De Barro, Jesús Navas-Castillo, Christopher A Omongo, Hélène Delatte, Kyeong-Yeoll Lee, Mitulkumar V Patel, Renate Krause-Sakate, James Ng, San-Ling Wu, Elvira Fiallo-Olivé, Shu-Sheng Liu, John Colvin, Xiao-Wei Wang,

A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper. ... Read more >>

Sci Rep (Scientific reports)
[2019, 9(1):8676]

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Insight into the microbial world of Bemisia tabaci cryptic species complex and its relationships with its host.

Hua-Ling Wang, Teng Lei, Wen-Qiang Xia, Stephen L Cameron, Yin-Quan Liu, Zhen Zhang, Maruthi M N Gowda, Paul De Barro, Jesús Navas-Castillo, Christopher A Omongo, Hélène Delatte, Kyeong-Yeoll Lee, Mitulkumar V Patel, Renate Krause-Sakate, James Ng, San-Ling Wu, Elvira Fiallo-Olivé, Shu-Sheng Liu, John Colvin, Xiao-Wei Wang,

The 37 currently recognized Bemisia tabaci cryptic species are economically important species and contain both primary and secondary endosymbionts, but their diversity has never been mapped systematically across the group. To achieve this, PacBio sequencing of full-length bacterial 16S rRNA gene amplicons was carried out on 21 globally collected species ... Read more >>

Sci Rep (Scientific reports)
[2019, 9(1):6568]

Cited: 1 time

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A method for real-time classification of insect vectors of mosaic and brown streak disease in cassava plants for future implementation within a low-cost, handheld, in-field multispectral imaging sensor.

Joseph Fennell, Charles Veys, Jose Dingle, Joachim Nwezeobi, Sharon van Brunschot, John Colvin, Bruce Grieve,

Background:The paper introduces a multispectral imaging system and data-processing approach for the identification and discrimination of morphologically indistinguishable cryptic species of the destructive crop pest, the whitefly Bemisia tabaci. This investigation and the corresponding system design, was undertaken in two phases under controlled laboratory conditions. The first exploited a prototype ... Read more >>

(Plant methods)
[2018, 14:82]

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Species-complex diversification and host-plant associations in Bemisia tabaci: A plant-defence, detoxification perspective revealed by RNA-Seq analyses.

Osnat Malka, Diego Santos-Garcia, Ester Feldmesser, Elad Sharon, Renate Krause-Sakate, Hélène Delatte, Sharon van Brunschot, Mitulkumar Patel, Paul Visendi, Habibu Mugerwa, Susan Seal, John Colvin, Shai Morin,

Insect-plant associations and their role in diversification are mostly studied in specialists. Here, we aimed to identify macroevolution patterns in the relationships between generalists and their host plants that have the potential to promote diversification. We focused on the Bemisia tabaci species complex containing more than 35 cryptic species. Mechanisms ... Read more >>

Mol Ecol (Molecular ecology)
[2018, 27(21):4241-4256]

Cited: 3 times

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African cassava whitefly, Bemisia tabaci, cassava colonization preferences and control implications.

Andrew Kalyebi, Sarina Macfadyen, Hazel Parry, Wee Tek Tay, Paul De Barro, John Colvin,

Cassava is a staple food for people across sub-Saharan Africa. Over the last 20 years, there has been an increased frequency of outbreaks and crop damage in this region caused by the cassava-adapted Bemisia tabaci putative species. Little is known about when and why B. tabaci adults move and colonize ... Read more >>

PLoS ONE (PloS one)
[2018, 13(10):e0204862]

Cited: 4 times

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An integrative approach to discovering cryptic species within the Bemisia tabaci whitefly species complex.

Soňa Vyskočilová, Wee Tek Tay, Sharon van Brunschot, Susan Seal, John Colvin,

Bemisia tabaci is a cryptic whitefly-species complex that includes some of the most damaging pests and plant-virus vectors of a diverse range of food and fibre crops worldwide. We combine experimental evidence of: (i) differences in reproductive compatibility, (ii) hybrid verification using a specific nuclear DNA marker and hybrid fertility ... Read more >>

Sci Rep (Scientific reports)
[2018, 8(1):10886]

Cited: 4 times

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African ancestry of New World, Bemisia tabaci-whitefly species.

Habibu Mugerwa, Susan Seal, Hua-Ling Wang, Mitulkumar V Patel, Richard Kabaalu, Christopher A Omongo, Titus Alicai, Fred Tairo, Joseph Ndunguru, Peter Sseruwagi, John Colvin,

Bemisia tabaci whitefly species are some of the world's most devastating agricultural pests and plant-virus disease vectors. Elucidation of the phylogenetic relationships in the group is the basis for understanding their evolution, biogeography, gene-functions and development of novel control technologies. We report here the discovery of five new Sub-Saharan Africa ... Read more >>

Sci Rep (Scientific reports)
[2018, 8(1):2734]

Cited: 10 times

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Desmodium mottle virus, the first legumovirus (genus Begomovirus) from East Africa.

Happyness G Mollel, Peter Sseruwagi, Joseph Ndunguru, Titus Alicai, John Colvin, Jesús Navas-Castillo, Elvira Fiallo-Olivé,

A novel bipartite legumovirus (genus Begomovirus, family Geminiviridae), that naturally infects the wild leguminous plant Desmodium sp. in Uganda, was molecularly characterized and named Desmodium mottle virus. The highest nucleotide identities for DNA-A, obtained from two field-collected samples, were 79.9% and 80.1% with the legumovirus, soybean mild mottle virus. DNA-B ... Read more >>

Arch. Virol. (Archives of virology)
[2017, 162(6):1799-1803]

Cited: 1 time

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Updated methods for assessing the impacts of nearby gas drilling and production on neighborhood air quality and human health.

Eduardo P Olaguer, Matthew Erickson, Asanga Wijesinghe, Brad Neish, Jeff Williams, John Colvin,

An explosive growth in natural gas production within the last decade has fueled concern over the public health impacts of air pollutant emissions from oil and gas sites in the Barnett and Eagle Ford shale regions of Texas. Commonly acknowledged sources of uncertainty are the lack of sustained monitoring of ... Read more >>

J Air Waste Manag Assoc (Journal of the Air & Waste Management Association (1995))
[2016, 66(2):173-183]

Cited: 2 times

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Identification and evaluation of suitable reference genes for gene expression studies in the whitefly Bemisia tabaci (Asia I) by reverse transcription quantitative realtime PCR.

Carl Collins, Mitulkumar V Patel, John Colvin, David Bailey, Susan Seal,

This study presents a reliable method for performing reverse transcription quantitative realtime PCR (RT-qPCR) to measure gene expression in the whitefly Bemisia tabaci (Asia I) (Gennadius) (Hemiptera: Aleyrodidae), utilising suitable reference genes for data normalisation. We identified orthologs of commonly used reference genes (actin (ACT), cyclophilin 1 (CYP1), elongation factor ... Read more >>

J Insect Sci (Journal of insect science (Online))
[2014, 14:63]

Cited: 4 times

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Plant-mediated whitefly-begomovirus interactions: research progress and future prospects.

Jun-Bo Luan, Xiao-Wei Wang, John Colvin, Shu-Sheng Liu,

Plant-mediated interactions between begomoviruses and whiteflies exert important influences on the population dynamics of vectors and the epidemiology of plant diseases. In this article, we synthesize the relevant literature to identify patterns to the interactions. We then review studies on the ecological, biochemical and molecular mechanisms underlying the interactions and ... Read more >>

Bull. Entomol. Res. (Bulletin of entomological research)
[2014, 104(3):267-276]

Cited: 21 times

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The bacterial communities in plant phloem-sap-feeding insects.

Xiangfeng Jing, Adam C-N Wong, John M Chaston, John Colvin, Cindy L McKenzie, Angela E Douglas,

The resident microbiota of animals represents an important contribution to the global microbial diversity, but it is poorly known in many animals. This study investigated the bacterial diversity in plant phloem-sap-feeding whiteflies, aphids and psyllids by pyrosequencing bacterial 16S rRNA gene amplicons. After correction for sequencing error, just 3-7 bacterial ... Read more >>

Mol. Ecol. (Molecular ecology)
[2014, 23(6):1433-1444]

Cited: 42 times

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The complete mitochondrial genome of Bemisia afer (Hemiptera: Aleyrodidae).

Hua-Ling Wang, Na Xiao, Jiao Yang, Xiao-Wei Wang, John Colvin, Shu-Sheng Liu,

The length of the Bemisia afer (Priesner & Hosny) (Hemiptera: Aleyrodidae) mitochondrial genome (mitogenome) is 14,968 bp and consists of 13 protein coding genes (PCGs), 21 transfer RNAs (tRNA), 2 ribosomal RNAs and 1 control region. Apart from one serine transfer RNA gene (tRNA-Ser) which is absent, the synteny is ... Read more >>

Mitochondrial DNA A DNA Mapp Seq Anal (Mitochondrial DNA. Part A, DNA mapping, sequencing, and analysis)
[2016, 27(1):98-99]

Cited: 6 times

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Pyrethroid insecticide resistance in British populations of the cabbage whitefly, Aleyrodes proletella.

Simon Springate, John Colvin,

BACKGROUND: The cabbage whitefly, Aleyrodes proletella L., is emerging as a significant pest of field brassica crops in certain regions of the United Kingdom. In order to investigate the contribution of pesticide resistance to this phenomenon, A. proletella populations were sampled from five different areas in England in 2008 and ... Read more >>

Pest Manag. Sci. (Pest management science)
[2012, 68(2):260-267]

Cited: 3 times

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Chapter 7. Critical care triage. Recommendations and standard operating procedures for intensive care unit and hospital preparations for an influenza epidemic or mass disaster.

Michael D Christian, Gavin M Joynt, John L Hick, John Colvin, Marion Danis, Charles L Sprung, ,

PURPOSE:To provide recommendations and standard operating procedures for intensive care unit (ICU) and hospital preparations for an influenza pandemic or mass disaster with a specific focus on critical care triage. METHODS:Based on a literature review and expert opinion, a Delphi process was used to define the essential topics including critical ... Read more >>

Intensive Care Med (Intensive care medicine)
[2010, 36 Suppl 1:S55-64]

Cited: 21 times

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Chapter 2. Surge capacity and infrastructure considerations for mass critical care. Recommendations and standard operating procedures for intensive care unit and hospital preparations for an influenza epidemic or mass disaster.

John L Hick, Michael D Christian, Charles L Sprung, ,

PURPOSE: To provide recommendations and standard operating procedures for intensive care unit (ICU) and hospital preparations for a mass disaster or influenza epidemic with a specific focus on surge capacity and infrastructure considerations. METHODS: Based on a literature review and expert opinion, a Delphi process was used to define the ... Read more >>

Intensive Care Med (Intensive care medicine)
[2010, 36 Suppl 1:S11-20]

Cited: 18 times

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